Company: MYI
Filing Date: 2025-10-03
Form Type: N-CSR
Source: 0001193125-25-230138
Chunk: 105

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-10-03
Form: N-CSR
Chunk 105
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 in these plans. (a)(4) Beneficial Ownership of Securities – As of July 31, 2025:

| Portfolio Manager      |     | Dollar Range of Equity Securities 
 of the Fund Beneficially Owned    |
| Walter O’Connor, CFA   |     | $1 - $10,000                      |
| Michael Kalinoski, CFA |     | $1 - $10,000                      |

| Christian Romaglino, CFA |     | $1 - $10,000 |
| Kevin Maloney, CFA       |     | None         |
| Phillip Soccio, CFA      |     | None         |
| Kristi Manidis           |     | None         |

(b) Not Applicable

| Item 14 – | Purchases of Equity Securities by Closed-End Management                                                                          
 Investment Company and Affiliated Purchasers – Not Applicable due to no such purchases during the period covered by this report. |

| Item 15 – | Submission of Matters to a Vote of Security Holders – There have been no material changes to these 
 procedures.                                                                                        |

| Item 16 – | Controls and Procedures |

(a) The registrant’s principal executive and principal financial officers, or persons performing similar functions, have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) underthe Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing date of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) underthe 1940 Act and Rule 13a-15(b)or 15d-15(b)under the Securities Exchange Act of 1934, as amended. (b) There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) underthe 1940 Act) that occurred during the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

| Item 17 – | Disclosure of Securities Lending Activities                     
 for Closed-End Management Investment Companies – Not Applicable |

| Item 18 – | Recovery of Erroneously Awarded Compensation – Not Applicable |

| Item 19 – | Exhibits attached her