Company: MYI
Filing Date: 2025-09-05
Form Type: 424B3
Source: 0001193125-25-196285
Chunk: 301

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-05
Form: 424B3
Chunk 301
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 whichever is earlier, unless the agreement is
terminated earlier by the parties.

SOLICITATION OF PROXIES

Solicitation of proxies is being made primarily by the mailing of this Notice and Joint Proxy Statement/Prospectus with its
enclosures on or about September 12, 2025. Shareholders of the Funds whose shares are held by nominees such as brokers can vote their proxies by contacting their respective nominee. In addition to the solicitation of proxies by mail, employees of
the Investment Advisor and their affiliates as well as dealers or their representatives may solicit proxies by mail, telephone, fax or the internet. The Funds and the Investment Advisor have retained Georgeson LLC to assist with the distribution of
proxy materials and the solicitation and tabulation of proxies. The cost of Georgeson LLC’s services in connection with the proxy is anticipated to be approximately $43,000, $66,000, $93,000, and $143,000 for MVT, MVF, MIY and the
Acquiring Fund, respectively.

LEGAL MATTERS

Certain legal matters concerning the U.S. federal income tax consequences of the Reorganizations will be passed upon by
Willkie Farr & Gallagher LLP, which serves as counsel to the Funds. Certain legal matters concerning the issuance of the common shares of the Acquiring Fund and the new issuance of Acquiring Fund VRDP Shares, will be passed upon by
Miles & Stockbridge P.C., which serves as special Maryland counsel to the Acquiring Fund.

INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

The independent registered public accounting firm for the Funds performs an annual audit of each Fund’s financial
statements. Each Fund’s Board has appointed Deloitte & Touche LLP to be each Fund’s independent registered public accounting firm. Deloitte & Touche LLP is located at 115 Federal Street, Boston, Massachusetts 02110.

OTHER MATTERS WITH RESPECT TO THE MEETING

Shareholders who want to communicate with the Board or any individual Board Member should write to the attention of the
Secretary of their Fund, 50 Hudson Yards, New York, New York 10001. Shareholders may communicate with the Boards electronically by sending an e-mail to closedendfundsbod@blackrock.com. The communication
should indicate that you are a Fund shareholder. If the communication is intended for a specific Board Member and so indicates, it will be sent only to that Board Member. If a communication does not indicate a specific Board Member, it will