Company: MYI
Filing Date: 2025-07-15
Form Type: 425
Source: 0001193125-25-159406
Chunk: 14

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-07-15
Form: 425
Chunk 14
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 securities of the Fund, or the disposition of securities of the Fund; or

(j) any changes in the Fund’s Articles of Incorporation, By-Laws or other governing instruments
or other actions that could impede the acquisition of control of the Fund.

Additional Information Regarding the Reorganization and Where to Find It.

This Offer to Purchase relates solely to the Offer and is not intended to, and does not, constitute an offer to
purchase or sell shares of the Fund or the Acquiring Fund in order to effect the Reorganization nor is it intended to solicit a proxy from any shareholder of the Fund. The solicitation of the purchase or sale of securities or of proxies to effect
the Reorganization will only be made by a definitive Proxy Statement/Prospectus.

The Proxy Statement/Prospectus is expected to be filed
with the SEC on or about the date hereof. After the Proxy Statement/Prospectus is filed with the SEC, it may be amended or withdrawn at any time. The Proxy Statement/Prospectus will not be distributed to shareholders of the Fund unless and until a
Registration Statement comprising of the Proxy Statement/Prospectus is declared effective by the SEC.

The Fund and its directors,
officers and employees, the Acquiring Fund and its directors, officers and employees, and BlackRock and its shareholders, officers and employees and other persons may be deemed to be participants in the solicitation of proxies with respect to the
Reorganization. Investors and shareholders may obtain more detailed information regarding the direct and indirect interests of the Fund’s directors, officers and employees, the Acquiring Fund’s directors, officers and employees, and
BlackRock and its shareholders, officers and employees and other persons by reading the Proxy Statement/Prospectus when it is filed with the SEC.

INVESTORS AND SHAREHOLDERS OF THE FUND AND THE ACQUIRING FUND ARE URGED TO READ THE PROXY STATEMENT/PROSPECTUS AND OTHER DOCUMENTS FILED WITH
THE SEC CAREFULLY AND IN THEIR ENTIRETY WHEN THEY BECOME AVAILABLE BECAUSE THESE DOCUMENTS WILL CONTAIN IMPORTANT INFORMATION ABOUT THE REORGANIZATION. INVESTORS SHOULD CONSIDER THE INVESTMENT OBJECTIVES, RISKS, CHARGES AND EXPENSES OF THE FUND AND
THE ACQUIRING FUND CAREFULLY. THE PROXY STATEMENT/PROSPECTUS WILL CONTAIN INFORMATION WITH RESPECT TO THE INVESTMENT OBJECTIVES, RISKS, CH