Company: MYI
Filing Date: 2025-09-08
Form Type: DEF 14A
Source: 0001193125-25-198172
Chunk: 287

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-08
Form: DEF 14A
Chunk 287
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permit further solicitation of proxies with respect to a proposal if they determine that adjournment and further solicitation is reasonable and in the best interests of shareholders. At the adjourned meeting, the Fund may transact any business which
might have been transacted at the original meeting. Any adjourned meeting may be held as adjourned one or more times without further notice not later than 120 days after the record date.

Please vote promptly by signing and dating each enclosed proxy card, and if received by mail, returning it (them) in the accompanying postage
paid return envelope OR by following the enclosed instructions to provide voting instructions by telephone or via the Internet.

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

By Order of the
Boards,

Janey Ahn

Secretary of the Funds

September 8, 2025

178

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,BlackRock MuniVest Fund II, Inc., a registered diversified closed-endinvestment company, File No. 811-07478,BlackRock MuniYield Michigan Quality Fund, Inc. a registered non-diversified closed-endinvestment company, File No. 811-07080(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 with, the Target Fund that: (a) The Acquiring Fund is a corporation duly incorporated, validly existing and in good standing in conformity with the laws of the State of Maryland and has the power to own all of its assets and to carry out this Agreement. The Acquiring Fund has all necessary federal, state and local author