Company: MYI
Filing Date: 2025-07-15
Form Type: 425
Source: 0001193125-25-158887
Chunk: 1

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-07-15
Form: 425
Chunk 1
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ings Fund, Inc. (MHD) 3 |

| • |     | Reorganizations of BlackRock MuniVest Fund, Inc. (MVF), BlackRock MuniVest Fund II, Inc. (MVT) and BlackRock 
 MuniYield Michigan Quality Fund, Inc. (MIY) with and into BlackRock MuniYield Quality Fund III, Inc. (MYI)   |

The shareholder meeting date is October 15, 2025. The completion of the Reorganizations is subject to the requisite approvals by each Fund’s respective common and preferred shareholders and the satisfaction of customary closing conditions.

Sixteen Muni CEFs will be reorganized into six acquiring funds:

| BlackRock Municipal Merger Summary |     |              |     |     |     |     |     |     |     |     |
| Acquiring Funds                    |     | Target Funds |     |     |     |     |     |     |     |     |
| MUA1                               |     | BTA          |     |     |     |     |     |     |     |     |
| MUC                                |     | BFZ          |     |     |     |     |     |     |     |     |
| MYN                                |     | BNY          |     | MHN |     |     |     |     |     |     |
| MQY2                               |     | MYD          |     | MQT |     | BKN |     | BHV |     | MPA |
| MHD3                               |     | MUE          |     | BFK |     | BYM |     | BLE |     |     |
| MYI                                |     | MVF          |     | MVT |     | MIY |     |     |     |     |

| 1) | Previously announced |

| 2) | Reorganization of MYD, MQT and BKN with and into MQY previously announced |

| 3) | Reorganization of BFK, BYM and BLE into MHD previously announced |

Additional Information about the Reorganizations and Where to Find It This press release is not intended to, and does not, constitute an offer to purchase or sell shares of the Funds nor is this press release intended to solicit a proxy from any shareholder of any of the Funds. The solicitation of the purchase or sale of securities or of proxies to effect the Reorganizations will only be made by either a definitive Proxy Statement or a definitive