Company: MYI
Filing Date: 2025-09-02
Form Type: N-14 8C/A
Source: 0001193125-25-193985
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Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-09-02
Form: N-14 8C/A
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As filed with the Securities and Exchange Commission on September 2, 2025 Securities Act File No. 333-288718 Investment Company Act File No. 811-06540 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM N-14 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ☒ Pre-EffectiveAmendment No. 1 ☐ Post-Effective Amendment No. ___ (Check appropriate box or boxes) BLACKROCK MUNIYIELD QUALITY FUND III, INC. (Exact Name of Registrant as Specified in Charter) 100 Bellevue Parkway Wilmington, Delaware 19809 (Address of Principal Executive Offices: Number, Street, City, State, Zip Code) (800) 882-0052 (Area Code and Telephone Number) John M. Perlowski President and Chief Executive Officer BlackRock MuniYield Quality Fund III, Inc. 50 Hudson Yards New York, New York 10001 (Name and Address of Agent for Service) With copies to:

| Margery K. Neale, Esq.       
 Elliot J. Gluck, Esq.        
 Willkie Farr & Gallagher LLP 
 787 Seventh Avenue New       
 York, New York 10019-6099    |     | Janey Ahn, Esq.           
 BlackRock Advisors, LLC   
 50 Hudson Yards New York, 
 New York 10001            |

AS SOON AS PRACTICABLE AFTER THE EFFECTIVE DATE OF THIS REGISTRATION STATEMENT (Approximate Date of Proposed Public Offering)

The Registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until this registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

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EXPLANATORY NOTE This Registration Statement is organized as follows:

| a. | Letter to Common Shareholders of BlackRock MuniVest Fund II, Inc. (“MVT”), BlackRock MuniYield                                     
 Michigan Quality Fund, Inc. (“MIY”), BlackRock MuniVest Fund, Inc. (“MVF”) and BlackRock MuniYield Quality Fund III, Inc. (“MYI”). |

| b. | Questions & Answers for