0000901243 2026-07-14 2026-07-14 0000901243 1 2026-07-14 2026-07-14 0000901243 2 2026-07-14 2026-07-14 0000901243 3 2026-07-14 2026-07-14 0000901243 4 2026-07-14 2026-07-14 0000901243 1 2026-07-14 2026-07-14 0000901243 2 2026-07-14 2026-07-14 iso4217:USD pure shares N-2 N-2/A EX-FILING FEES 333-296185 0000901243 BLACKROCK MUNIASSETS FUND, INC. N/A true false N-2 BLACKROCK MUNIASSETS FUND, INC. false Equity Shares of Common Stock, $0.10 par value true 16908173 10.89 184130003.97 0.0001381 25428.35 false Other Rights to Purchase Shares of Common Stock true 0.0001381 0.00 true Equity Shares of Common Stock, $0.10 par value true 91827 10.89 999996.03 138.10 true Other Rights to Purchase Shares of Common Stock true 0.00 185130000.00 25566.45 138.10 1234.47 24193.88 (1) The Maximum Aggregate Offering Price is estimated solely for the purpose of determining the registration fee in accordance with Rule 457(c) under the Securities Act of 1933, as amended (the "Securities Act"). (2) No separate consideration will be received by the Registrant. Any shares issued pursuant to an offering of rights to purchase shares of common stock, including any shares issued pursuant to an over-subscription privilege or a secondary over-subscription privilege, will be shares registered under this Registration Statement. (3) This Maximum Aggregate Offering Price was originally registered under Rule 457(o) and is now converted to Rule 457(a). (4) The Registrant previously paid $138.10 in connection with the filing of the Registrant's Registration Statement on Form N-2 (File No. 333-296185) with the Securities and Exchange Commission on May 22, 2026. The fee was estimated solely for the purpose of calculating the registration fee in accordance with Rule 457(o) under the Securities Act. See note (3) above. (2) No separate consideration will be received by the Registrant. Any shares issued pursuant to an offering of rights to purchase shares of common stock, including any shares issued pursuant to an over-subscription privilege or a secondary over-subscription privilege, will be shares registered under this Registration Statement. true BlackRock MuniAssets Fund, Inc. N-2 333-258015 2021-08-24 1234.47 Equity Shares of Common Stock, $0.10 par value 4767963 76764204.00 true BlackRock MuniAssets Fund, Inc. N-2 333-258015 2021-08-24 1423.55 A registration fee amount of $1,234.47, which represents that portion of the registration fee attributable to the unsold securities under the Registration Statement on Form N-2 (File No. 333-258015) initially filed on July 19, 2021, and amended by Pre-Effective Amendment No. 1 on August 24, 2021, is being applied to offset the registration fee currently due pursuant to Rule 457(p) under the Securities Act of 1933, as amended. The offering of unsold shares of common stock under any prior registration statement will be terminated upon effectiveness. A registration fee amount of $1,234.47, which represents that portion of the registration fee attributable to the unsold securities under the Registration Statement on Form N-2 (File No. 333-258015) initially filed on July 19, 2021, and amended by Pre-Effective Amendment No. 1 on August 24, 2021, is being applied to offset the registration fee currently due pursuant to Rule 457(p) under the Securities Act of 1933, as amended. The offering of unsold shares of common stock under any prior registration statement will be terminated upon effectiveness.