Company: MYI
Filing Date: 2025-07-15
Form Type: 425
Source: 0001193125-25-159406
Chunk: 20

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-07-15
Form: 425
Chunk 20
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deliver any additional documents deemed by the Depositary or the Fund to be necessary or desirable to complete the sale, assignment and transfer of the tendered Shares (and any and all dividends, distributions, other Shares or securities or rights
declared or issuable in respect of such Shares after the Expiration Date); and (d) the tendering stockholder has read and agreed to all of the terms of the Offer, including this Offer to Purchase and the Letter of Transmittal.

B. Signature Guarantees and Method of Delivery.All signatures on the Letter of Transmittal must be guaranteed by an Eligible
Institution. (See Instruction 2 of the Letter of Transmittal.) An “Eligible Institution” is a firm which is a broker, dealer, commercial bank, credit union, savings association or other entity and which is a member in good standing of a
stock transfer association’s approved medallion program (such as STAMP, SEMP or MSP).

If the Letter of Transmittal is signed by the
registered holder(s) of the Shares tendered for purchase thereby, the signature(s) must correspond with the name(s) as written on the face of the certificate(s) for the Shares tendered for purchase without any alteration, enlargement or any change
whatsoever.

If any of the Shares tendered for purchase thereby are owned of record by two or more joint owners, all such owners must sign
the Letter of Transmittal.

If any of the Shares tendered for purchase are registered in different names, it is necessary to complete,
sign and submit as many separate Letters of Transmittal as there are different registrations.

If the Letter of Transmittal or any
certificates for Shares tendered for purchase or stock powers relating to Shares tendered for purchase are signed by trustees, executors, administrators, guardians,
attorneys-in-fact, officers of corporations or others acting in a fiduciary or representative capacity, such persons should so indicate when signing, and proper evidence
satisfactory to the Fund of their authority so to act must be submitted together with the Letter of Transmittal.

If the Letter of
Transmittal is signed by the registered holder(s) of the Shares tendered for purchase, no endorsements of certificates or separate stock powers with respect to such Shares are required unless payment is to be made to, or certificates for Shares not
purchased are to be issued in the name of, a person other than the registered holder(s). Signatures on such