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Summary Prospectus |
| Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) |
|
Investor A Shares |
|
Institutional Shares |
| Management Fee1,2,3 |
|
0.04% |
|
0.04% |
| Distribution and/or Service (12b-1) Fees |
|
0.25% |
|
None |
| Other Expenses4 |
|
0.06% |
|
0.06% |
| Administration Fees |
0.06% |
|
0.06% |
|
| Independent Expenses4 |
— |
|
— |
|
| Total Annual Fund Operating Expenses |
|
0.35% |
|
0.10% |
| Fee Waivers and/or Expense Reimbursements2,3,4 |
|
— |
|
— |
| Total Annual Fund Operating Expenses After Fee Waivers and/or Expense Reimbursements2,3,4 |
|
0.35% |
|
0.10% |
| |
1 Year |
3 Years |
5 Years |
10 Years |
| Investor A Shares |
$36 |
$113 |
$197 |
$443 |
| Institutional Shares |
$10 |
$32 |
$56 |
$128 |
| For the periods ended 12/31/25
Average Annual Total Returns |
1 Year |
5 Years |
10 Years |
| iShares U.S. Aggregate Bond Index Fund — Investor A Shares |
|
|
|
| Return Before Taxes |
6.71 % |
(0.71 )% |
1.65 % |
| Return After Taxes on Distributions |
5.20 % |
(1.81 )% |
0.61 % |
| Return After Taxes on Distributions and Sale of Fund Shares |
3.95 % |
(1.01 )% |
0.82 % |
| iShares U.S. Aggregate Bond Index Fund — Institutional Shares |
|
|
|
| Return Before Taxes |
6.98 % |
(0.46 )% |
1.90 % |
| Bloomberg U.S. Aggregate Bond Index
(Reflects no deduction for fees, expenses or taxes) |
7.30 % |
(0.36 )% |
2.01 % |
| Portfolio Manager |
Portfolio Manager of the Master Portfolio Since |
Title |
| James Mauro |
2011 |
Managing Director of BlackRock, Inc. |
| Jonathan Graves |
2025 |
Managing Director of BlackRock, Inc. |
| Marcus Tom |
2025 |
Director of BlackRock, Inc. |
| |
Investor A Shares |
Institutional Shares |
| Minimum Initial
Investment |
$1,000 for all accounts except: •$50, if establishing an Automatic Investment Plan. •There is no investment minimum for employer-
sponsored retirement plans (not including SEP
IRAs, SIMPLE IRAs or SARSEPs). •There is no investment minimum for certain fee- based programs. |
There is no minimum initial investment for: •Employer-sponsored
retirement plans (not including SEP IRAs, SIMPLE IRAs or SARSEPs),
state sponsored 529 college savings plans,
collective trust funds, investment companies or
other pooled investment vehicles, unaffiliated
thrifts and unaffiliated banks and trust
companies, each of which may purchase shares
of the Fund through a Financial Intermediary that
has entered into an agreement with the Fund’s
distributor to purchase such shares. •Clients of Financial Intermediaries that: (i) charge such clients a fee for advisory, investment consulting, or similar services or (ii) have entered into an agreement with the Fund’s distributor to offer Institutional Shares through a no-load program or investment platform. •Clients investing through a self-directed IRA
brokerage account program sponsored by a
retirement plan record-keeper, provided that such
program offers only mutual fund options and that
the program maintains an account with the Fund
on an omnibus basis. $2 million for individuals and “Institutional Investors,” which include, but are not limited to, endowments, foundations, family offices, local, city, and state governmental institutions, corporations and insurance company separate accounts who may purchase shares of the Fund through a Financial Intermediary that has entered into an agreement with the Fund’s distributor to purchase such shares. $1,000 for: •Clients investing through Financial Intermediaries
that offer such shares on a platform that charges
a transaction based sales commission outside of
the Fund. •Tax-qualified
accounts for insurance agents that are registered representatives of an insurance
company’s broker-dealer that has entered into an
agreement with the Fund’s distributor to offer
Institutional Shares, and the family members of
such persons. |
| Minimum Additional Investment |
$50 for all accounts (with the exception of certain employer-sponsored retirement plans which may have a lower minimum). |
No subsequent minimum. |