X0306 4 2021-03-08 0 0001167467 BLACKROCK MUNICIPAL BOND TRUST BBK 0001075522 CAVANAGH RICHARD 55 EAST 52ND STREET NEW YORK NY 10055 1 0 0 0 Common Stock 2021-03-08 4 J 0 119 D 0 D Effective as of March 8, 2021, BlackRock Municipal Bond Trust (the "Target Fund") was reorganized into BlackRock MuniHoldings Fund, Inc. (the "Acquiring Fund"). In the Reorganization, common shareholders of the Target Fund received common shares of the Acquiring Fund having a value equal to the aggregate NAV of the Target Fund common shares surrendered as determined at the close of business on March 5, 2021, less the costs of the Reorganization. As of March 5, 2021, the Target Fund reported a NAV per share of $16.4314 and the Acquiring Fund reported a NAV per share of $16.9927. The conversion ratio for the Target Fund's common shares was 0.96696817. In the Reorganization, Richard E. Cavanagh received 115 common shares (and cash for fractional shares, if any) of the Acquiring Fund in exchange for his 119 common shares of the Target Fund. /s/ Dean A. Caruvana as Attorney-in-Fact 2021-03-10