Company: MYI
Filing Date: 2025-07-15
Form Type: 425
Source: 0001193125-25-159406
Chunk: 21

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-07-15
Form: 425
Chunk 21
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 certificates or stock powers must be guaranteed by an Eligible Institution.

If the Letter of Transmittal is signed by a person other than the registered holder(s) of the certificate(s) listed thereon, the
certificate(s) must be endorsed or accompanied by appropriate stock powers, in either case signed exactly as the name(s) of the registered holder(s) appear(s) on the certificate(s) for the Shares involved. Signatures on such certificates or stock
powers must be guaranteed by an Eligible Institution.

THE METHOD OF DELIVERY OF ANY DOCUMENTS, INCLUDING CERTIFICATES FOR SHARES, IS AT THE ELECTION AND RISK OF THE PARTY TENDERING SHARES. IF DOCUMENTS ARE SENT BY MAIL, IT IS RECOMMENDED THAT THEY BE SENT BY REGISTERED MAIL, PROPERLY INSURED, WITH RETURN RECEIPT REQUESTED.

C. Book-Entry Delivery.Any financial institution that is a participant in the DTC system may make book-entry delivery of tendered
Shares in accordance with DTC’s procedures. However, although delivery of Shares may be effected through book-entry transfer at DTC, a Letter of Transmittal properly completed and bearing original signature(s) and the original of any required
signature guarantee(s) or an Agent’s Message (as defined below) in connection with a book-entry transfer and any other documents required by the Letter of Transmittal, must be received by the Depositary prior to the Expiration Date at one of
its addresses set forth on the back cover page of this Offer to Purchase.

The term “Agent’s Message” means a message from
DTC transmitted to, and received by, the Depositary forming a part of a timely confirmation of a book-entry transfer of Shares (a “Book-Entry Confirmation”) which states that (a) DTC has received an express acknowledgment from the DTC
participant tendering the Shares for purchase that are the subject of the Book-Entry Confirmation, (b) the DTC participant has received and agrees to be bound by the terms of the Letter of Transmittal, and (c) the Fund may enforce such
agreement against the DTC participant. Delivery of documents to DTC in accordance with DTC’s procedures does not constitute delivery to the Depositary.

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D. Determinations of Validity.All questions as to the validity, form, eligibility (including time of receipt) and acceptance of tenders will be determined by the Fund, in its sole discretion, which determination shall be final and binding. The Fund reserves