0000844779 bf:C000234047Member 2025-10-31 2026-04-30 0000844779 bf:C000234048Member 2025-10-31 2026-04-30 0000844779 bf:C000234049Member 2025-10-31 2026-04-30 0000844779 bf:C000234050Member 2025-10-31 2026-04-30 0000844779 bf:C000234051Member 2025-10-31 2026-04-30 0000844779 bf:C000253864Member 2025-10-31 2026-04-30 0000844779 2025-10-31 2026-04-30 0000844779 bf:C000234047Member 2026-04-30 0000844779 us-gaap:CorporateBondSecuritiesMember bf:C000234047Member 2026-04-30 0000844779 bf:ForeignAgencyObligationsMember bf:C000234047Member 2026-04-30 0000844779 us-gaap:MunicipalBondsMember bf:C000234047Member 2026-04-30 0000844779 bf:C000234048Member 2026-04-30 0000844779 us-gaap:CorporateBondSecuritiesMember bf:C000234048Member 2026-04-30 0000844779 bf:ForeignAgencyObligationsMember bf:C000234048Member 2026-04-30 0000844779 us-gaap:MunicipalBondsMember bf:C000234048Member 2026-04-30 0000844779 bf:C000234049Member 2026-04-30 0000844779 bf:USGovernmentSponsoredAgencySecuritiesMember bf:C000234049Member 2026-04-30 0000844779 bf:USTreasuryObligationsMember bf:C000234049Member 2026-04-30 0000844779 bf:C000234050Member 2026-04-30 0000844779 bf:USGovernmentSponsoredAgencySecuritiesMember bf:C000234050Member 2026-04-30 0000844779 bf:USTreasuryObligationsMember bf:C000234050Member 2026-04-30 0000844779 bf:C000234051Member 2026-04-30 0000844779 us-gaap:AssetBackedSecuritiesMember bf:C000234051Member 2026-04-30 0000844779 us-gaap:CorporateBondSecuritiesMember bf:C000234051Member 2026-04-30 0000844779 bf:NonAgencyMortgageBackedSecuritiesMember bf:C000234051Member 2026-04-30 0000844779 bf:USGovernmentSponsoredAgencySecuritiesMember bf:C000234051Member 2026-04-30 0000844779 bf:C000253864Member 2026-04-30 0000844779 bf:C000253864Member bf:BlackRockCashFundsTreasurySLAgencySharesMember 2026-04-30 0000844779 us-gaap:CertificatesOfDepositMember bf:C000253864Member 2026-04-30 0000844779 us-gaap:CommercialPaperMember bf:C000253864Member 2026-04-30 0000844779 bf:FuturesContractsNetCumulativeAppreciationMember bf:C000253864Member 2026-04-30 0000844779 bf:LiabilitiesInExcessOfOtherAssetsMember bf:C000253864Member 2026-04-30 0000844779 us-gaap:MoneyMarketFundsMember bf:C000253864Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills375020527Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills379082426Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills390091426Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills398081026Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills400081426Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills403021927Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills405111326Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills432071426Member 2026-04-30 0000844779 bf:C000253864Member bf:USTreasuryBills440060226Member 2026-04-30 0000844779 bf:USTreasuryObligationsMember bf:C000253864Member 2026-04-30 iso4217:USD pure bf:Holding 0000844779 false N-1A N-CSRS BlackRock Funds 2026-04-30 iShares Enhanced Roll Yield Index Fund iShares Enhanced Roll Yield Index Fund BERYX This semi-annual shareholder report contains important information about iShares Enhanced Roll Yield Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div><div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares Enhanced Roll Yield Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>455,024,218</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">161</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">0<span>%</span></td> </tr> </table> 455024218 161 0 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div><div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="page-break-inside: avoid; break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Asset Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of<br/>Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Obligations</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">59.8</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Certificates of Deposit</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">20.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Futures contracts, net cumulative appreciation</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">12.6</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Money Market Funds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">9.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Commercial Paper</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">Liabilities in Excess of Other Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">(5.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span>)</span></td> </tr> </table> <table style="page-break-inside: avoid; break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 6pt 1.5pt 0;"><strong>Ten largest holdings</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Security</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;">Percent of<br/>Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 6pt 0 0;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">BlackRock Cash Funds: Treasury, SL Agency Shares</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">9.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.32%, 07/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">5.4</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.40%, 06/02/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.9</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.00%, 08/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.79%, 08/24/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.03%, 02/19/27</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.98%, 08/10/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.05%, 11/13/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.75%, 02/05/27</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.90%, 09/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> 0.598 0.203 0.126 0.093 0.032 -0.052 <table style="page-break-inside: avoid; break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 6pt 1.5pt 0;"><strong>Ten largest holdings</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Security</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 0;">Percent of<br/>Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 6pt 0 0;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">BlackRock Cash Funds: Treasury, SL Agency Shares</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">9.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.32%, 07/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">5.4</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.40%, 06/02/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.9</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.00%, 08/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.79%, 08/24/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.03%, 02/19/27</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.98%, 08/10/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 4.05%, 11/13/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.3</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.75%, 02/05/27</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Bills, 3.90%, 09/14/26</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">3.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; white-space: nowrap; width: auto; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> 0.093 0.054 0.039 0.033 0.033 0.033 0.033 0.033 0.032 0.032 iShares U.S. Intermediate Credit Bond Index Fund iShares U.S. Intermediate Credit Bond Index Fund BICBX This semi-annual shareholder report contains important information about iShares U.S. Intermediate Credit Bond Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div> <div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares U.S. Intermediate Credit Bond Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>3,687,958,485</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">5,805</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">11<span>%</span></td> </tr> </table> 3687958485 5805 0.11 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Investment Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of Total<br/>Investments<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Corporate Bonds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">88.7</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Foreign Agency Obligations</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">10.8</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">Municipal Bonds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">0.5</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid; margin-top: 0px;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 0 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Excludes short-term securities.</div> </td> </tr> </table> 0.887 0.108 0.005 iShares U.S. Intermediate Government Bond Index Fund iShares U.S. Intermediate Government Bond Index Fund BIGBX This semi-annual shareholder report contains important information about iShares U.S. Intermediate Government Bond Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div> <div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares U.S. Intermediate Government Bond Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>7,697,357,911</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">217</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">16<span>%</span></td> </tr> </table> 7697357911 217 0.16 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Investment Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of Total<br/>Investments<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Obligations</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">98.6</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">U.S. Government Sponsored Agency Securities</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">1.4</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid; margin-top: 0px;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 0 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Excludes short-term securities.</div> </td> </tr> </table> 0.986 0.014 iShares U.S. Long Credit Bond Index Fund iShares U.S. Long Credit Bond Index Fund BLCBX This semi-annual shareholder report contains important information about iShares U.S. Long Credit Bond Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div> <div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares U.S. Long Credit Bond Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>2,389,993,455</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">3,323</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">9<span>%</span></td> </tr> </table> 2389993455 3323 0.09 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Investment Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of Total<br/>Investments<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Corporate Bonds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">90.4</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Foreign Agency Obligations</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">5.7</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">Municipal Bonds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">3.9</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid; margin-top: 0px;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 0 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Excludes short-term securities.</div> </td> </tr> </table> 0.904 0.057 0.039 iShares U.S. Long Government Bond Index Fund iShares U.S. Long Government Bond Index Fund BLGBX This semi-annual shareholder report contains important information about iShares U.S. Long Government Bond Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div> <div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares U.S. Long Government Bond Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>3,037,670,819</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">104</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">7<span>%</span></td> </tr> </table> 3037670819 104 0.07 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Investment Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of Total<br/>Investments<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Treasury Obligations</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">99.2</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">U.S. Government Sponsored Agency Securities</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">0.8</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid; margin-top: 0px;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 0 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Excludes short-term securities.</div> </td> </tr> </table> 0.992 0.008 iShares U.S. Securitized Bond Index Fund iShares U.S. Securitized Bond Index Fund BISBX This semi-annual shareholder report contains important information about iShares U.S. Securitized Bond Index Fund (the “Fund”) for the period of November 1, 2025 to April 30, 2026. semi-annual shareholder report You can find additional information about the Fund at <span style="color: rgb(0, 0, 0); font-weight: bold; text-decoration-line: none; font-family: 'arial'; font-size: 8pt; line-height: 10.4pt; text-align: justify;">blackrock.com/fundreports</span>. You can also request this information by contacting us at (800) 441‑7762. blackrock.com/fundreports (800) 441‑7762 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;"><b>What were the </b> <b>Fund</b> <b> costs for the </b> <b>last six months</b> <b>?</b></div> <div style="font-family: 'arial'; font-size: 9pt; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; margin: 0px;">(based on a hypothetical $10,000 investment)</div> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); vertical-align: bottom; text-align: left; padding: 2pt 0 2pt 0;">Fund name</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs of a $10,000<br/>investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-size: 9pt; color: rgb(0, 0, 0); font-kerning: none; font-weight: bold; line-height: 11pt; background-color: rgb(255, 206, 0); text-align: center; vertical-align: bottom; padding: 2pt 0 2pt 0;">Costs paid as a percentage of a<br/>$10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; vertical-align: bottom; font-size: 8pt; line-height: 10pt; text-align: left; padding: 4pt 0 2pt 0;">iShares U.S. Securitized Bond Index Fund</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;"><span style="float: none;">$</span>0<span style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</span></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; vertical-align: bottom; text-align: center; font-size: 8pt; line-height: 10pt; white-space: nowrap; padding: 4pt 0 2pt 0;">0.00<span>%</span><sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)(c)</sup></td> </tr> </table> <table style="margin-top: 2pt; break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than $1.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(b)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Annualized.</div> </td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; width: initial; vertical-align: top; text-indent: 0; padding: 0 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(c)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: 100%; padding: 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Rounds to less than 0.01%.</div> </td> </tr> </table> 0 0.0000 <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); vertical-align: bottom; width: auto; font-weight: bold; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;">Key Fund statistics</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Net Assets</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;"><span style="float: none;">$</span>5,799,521,298</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 0 6pt;">Number of Portfolio Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 0 6pt;">1,990</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-size: 8pt; line-height: 10pt; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 6pt 1.6pt 6pt;">Portfolio Turnover Rate</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; white-space: nowrap; font-size: 8pt; line-height: 10pt; width: 12%; vertical-align: bottom; padding: 1.6pt 6pt 1.6pt 6pt;">110<span>%</span></td> </tr> </table> 5799521298 1990 1.10 <div style="font-family: 'arial'; font-kerning: none; font-weight: bold; font-size: 10pt; color: rgb(0, 0, 0); margin: 0px 0px -0.18pt 0px;">What did the Fund invest in?</div> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; text-align: justify; font-size: 9pt; line-height: 11.4pt; margin: 0px;">(as of April 30, 2026)</div> <table style="break-inside: avoid-page; page-break-inside: avoid; table-layout: auto; width: 100%; border-collapse: collapse; margin-top: 0px;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; background-color: rgb(255, 206, 0); border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td colspan="3" style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); white-space: nowrap; vertical-align: bottom; width: auto; font-weight: normal; font-style: normal; font-size: 10pt; line-height: normal; text-align: left; text-indent: 0; letter-spacing: normal; text-transform: none; font-kerning: none; margin-top: 0; margin-bottom: 0; padding: 2pt 0 1.5pt 0;"><strong>Portfolio composition</strong></td> </tr> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; font-family: 'arial'; font-style: italic; font-size: 8pt; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; font-weight: normal; text-align: left; vertical-align: bottom; text-indent: -6pt; width: auto; padding: 1.6pt 0 0 6pt;">Investment Type</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;">Percent of Total<br/>Investments<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; text-align: left; width: auto; font-size: 8pt; white-space: nowrap; vertical-align: bottom; padding: 1.6pt 0 0 6pt;"></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">U.S. Government Sponsored Agency Securities</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">96.0</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span>%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Non-Agency Mortgage-Backed Securities</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">2.5</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 0 6pt;">Asset-Backed Securities</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 0 0;">1.4</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 0 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; line-height: 10pt; border-bottom-color: rgb(0, 0, 0); border-bottom-style: solid; border-bottom-width: 0.5pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; font-weight: normal; text-align: left; width: 100%; vertical-align: bottom; text-indent: -6pt; padding: 1.6pt 0 1.6pt 6pt;">Corporate Bonds</td> <td style="break-inside: avoid-page; page-break-inside: avoid; text-align: right; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 2pt 0 1.6pt 0;">0.1</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); vertical-align: bottom; font-kerning: none; text-align: left; width: auto; white-space: nowrap; font-style: normal; font-size: 8pt; line-height: 10pt; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; padding: 1.6pt 0 1.6pt 0;"><span style="visibility: hidden; margin-left: -7pt;">%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; break-inside: avoid-page; page-break-inside: avoid; margin-top: 0px;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; overflow-x: hidden; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; width: initial; text-indent: 0; padding: 1.6pt 6pt 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">​<sup style="vertical-align: 0.5em; font-size: smaller; line-height: 0px;">(a)</sup></div> </td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Arial'; font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; text-indent: 0; width: 100%; padding: 1.6pt 0 0 0;"> <div style="font-weight: normal; color: rgb(0, 0, 0); font-kerning: none; font-family: 'arial'; font-style: normal; font-size: 7pt; line-height: 9pt; text-align: justify; vertical-align: top; padding: 0px; margin: 0px;">Excludes short-term securities.</div> </td> </tr> </table> 0.960 0.025 0.014 0.001 Rounds to less than $1. Annualized. Rounds to less than 0.01%. Rounds to less than $1. Annualized. Rounds to less than 0.01%. Excludes short-term securities. Rounds to less than $1. Annualized. Rounds to less than 0.01%. Excludes short-term securities. Rounds to less than $1. Annualized. Rounds to less than 0.01%. Excludes short-term securities. Rounds to less than $1. Annualized. Rounds to less than 0.01%. Excludes short-term securities. Rounds to less than $1. Annualized. Rounds to less than 0.01%. Excludes short-term securities.