Company: MYI
Filing Date: 2025-09-08
Form Type: DEF 14A
Source: 0001193125-25-198172
Chunk: 347

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-08
Form: DEF 14A
Chunk 347
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 October 15, 2025. The Joint Proxy Statement/Prospectus and Proxy card for this meeting are available at: https://www.proxy-direct.com/blk-34668

| Authorized Signatures — This section must be completed for your vote to be counted. — Sign and Date Below |

| Note: | Please sign exactly as your name(s) appear(s) on this Proxy Card, and date it. When shares are held jointly, each                                                                                                       
 holder should sign. When signing as attorney, executor, guardian, administrator, trustee, officer of corporation or other entity or in another representative capacity, please give the full title under the signature. |

| Date (mm/dd/yyyy) — Please print date below |     | Signature 1 — Please keep signature within the box |     | Signature 2 — Please keep signature within the box |
| /   /                                       |     |                                                    |     |                                                    |

| Scanner bar code |     |             |     |          |
| xxxxxxxxxxxxxx   |     | MVF 2 34668 |     | xxxxxxxx |

| BlackRock MuniVest Fund II, Inc. 
 PO Box 43131                     
 Providence, RI 02940-3131        |     | EVERY VOTE IS IMPORTANT          |     |                            |
|                                  |     |                                  |     | MAIL                       |
|                                  |     |                                  |     | Vote, Sign and Mail in the |
|                                  |     | enclosed Business Reply Envelope |     |                            |

PREFERRED SHARES The undersigned hereby appoints John M. Perlowski and Jay M. Fife, and each of them, as proxies, each with the power to appoint his substitute, and hereby authorizes them to represent and to vote, as designated on the reverse side hereof, all of the shares of BlackRock MuniVest Fund II, Inc., a Maryland corporation (“MVT”), that the undersigned is entitled to vote at the Joint Special Meeting of Shareholders of the Fund to be held on October 15, 2025, at [•] a.m. (Eastern Time) (the “Joint Special Meeting”), and any adjournment(s) or postponement(s) thereof, to cast on behalf of the undersigned all votes that the undersigned is entitled to cast at the Joint Special Meeting and otherwise to represent the undersigned at the Joint Special Meeting with all powers possessed by the undersigned as if personally present at the Joint Special Meeting. The Joint Special