Company: MYI
Filing Date: 2025-09-05
Form Type: 424B3
Source: 0001193125-25-196285
Chunk: 303

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-05
Form: 424B3
Chunk 303
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, the Funds also have access to specific information regarding their transactions in each Fund.

The Funds do not disclose any non-public personal information about their shareholders
or former shareholders to anyone, except as permitted by law or as is necessary in order to service our shareholders’ accounts (for example, to a transfer agent).

The Funds restrict access to non-public personal information about their shareholders
to BlackRock employees with a legitimate business need for the information. The Funds maintain physical, electronic and procedural safeguards designed to protect the non-public personal information of our
shareholders.

183

OTHER INFORMATION

BlackRock is independent in ownership and governance, with no single majority stockholder and a majority of independent
directors.

If you cannot be present at the Special Meeting, please fill in, sign and return the enclosed proxy card or
please record your voting instructions by telephone or via the Internet promptly. No postage is necessary if the enclosed proxy card is mailed in the United States.

John M. Perlowski

President and Chief Executive Officer

BR MV F II,
I.

BR MY M
Q F, .

BR
MV F, I.

BR
MY Q F III, I.

September 4, 2025

184

APPENDIX A FORM OF AGREEMENT AND PLAN OF REORGANIZATION [●], 2025 In order to consummate the reorganization contemplated herein (the “ Reorganization”) and in consideration of the promises and the covenants and agreements hereinafter set forth, and intending to be legally bound, [BlackRock MuniVest Fund, Inc., a registered diversified closed-endinvestment company, File No. 811-05611,] 1[BlackRock MuniVest Fund II, Inc., a registered diversified closed-endinvestment company, File No. 811-07478,] 2[BlackRock MuniYield Michigan Quality Fund, Inc. a registered non-diversified closed-endinvestment company, File No. 811-07080] 3(the “ Target Fund”), and BlackRock MuniYield Quality Fund III, Inc., a registered diversified closed-endinvestment company, File No. 811-06540(the “ Acquiring Fund” and together with the Target Fund, the “ Funds”), each hereby enter into this Agreement and Plan of Reorganization (the “ Agreement”) as of the date first set forth above and agree as follows: 1. REPRESENTATIONS AND WARRANTIES OF THE ACQUIRING FUND. The Acquiring Fund represents and warrants to, and agrees