Company: MYI
Filing Date: 2025-09-08
Form Type: DEF 14A
Source: 0001193125-25-198172
Chunk: 348

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-08
Form: DEF 14A
Chunk 348
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 Meeting will be held in a virtual meeting format only, at the following Website: https://meetnow.global/MUUJ79Z. To attend and participate in the virtual Joint Special Meeting, enter the 14-digitcontrol number from the shaded box on this card. The validity of this proxy is governed by Maryland law. This proxy does not revoke any prior powers of attorney except for prior proxies given in connection with the Joint Special Meeting. The undersigned hereby acknowledges receipt of the Joint Proxy Statement/Prospectus, the terms of which are incorporated herein by reference, and revokes any proxy heretofore given with respect to the Joint Special Meeting. THIS PROXY, IF PROPERLY EXECUTED, WILL BE VOTED IN THE MANNER DIRECTED HEREIN BY THE UNDERSIGNED SHAREHOLDER. IF NO DIRECTION IS MADE, THIS PROXY WILL BE VOTED “FOR” THE PROPOSALS. IN THEIR DISCRETION, THE PROXIES ARE AUTHORIZED TO VOTE UPON SUCH OTHER BUSINESS AS MAY PROPERLY BE PRESENTED AT THE JOINT SPECIAL MEETING AND ANY ADJOURNMENTS OR POSTPONEMENTS THEREOF.

MVT_34668_071425_Pref PLEASE MARK, SIGN AND DATE THIS PROXY CARD ON THE REVERSE SIDE AND RETURN IT PROMPTLY USING THE ENCLOSED ENVELOPE.

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THIS PROXY IS SOLICITED ON BEHALF OF THE BOARD. THE BOARD RECOMMENDS VOTING “FOR” THE PROPOSALS.

| TO VOTE MARK BLOCKS BELOW IN BLUE OR BLACK INK AS SHOWN IN THIS EXAMPLE: |     | ☒ |

| Proposals |

|     |     |                                                                                                                                                                                                                                                         |     | FOR |     | AGAINST |     | ABSTAIN |
| 1a. |     | The common shareholders and holders of Variable Rate Muni                                                                                                                                                                                               
 Term Preferred Shares (“VMTP Shares” and the holders thereof, “VMTP Holders”) of MVT are being asked to vote as a single class on a proposal to approve an Agreement and Plan of Reorganization between MVT and BlackRock                               
 MuniYield Quality Fund III, Inc. (the “Acquiring Fund”) (the “MVT Reorganization Agreement”) and the transactions contemplated therein, including (i) the acquisition by the Acquiring Fund of substantially all of                                     
 MVT’s assets and the assumption by the Acquiring Fund of substantially all