<SEC-DOCUMENT>0001193125-25-238646.txt : 20251014
<SEC-HEADER>0001193125-25-238646.hdr.sgml : 20251014
<ACCEPTANCE-DATETIME>20251014114556
ACCESSION NUMBER:		0001193125-25-238646
CONFORMED SUBMISSION TYPE:	424B3
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20251014
DATE AS OF CHANGE:		20251014

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIYIELD QUALITY FUND III, INC.
		CENTRAL INDEX KEY:			0000883412
		ORGANIZATION NAME:           	
		EIN:				223165131
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		424B3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-288718
		FILM NUMBER:		251390631

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		800-441-7762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD QUALITY FUND III, INC
		DATE OF NAME CHANGE:	20101109

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BLACKROCK MUNIYIELD INSURED FUND, INC
		DATE OF NAME CHANGE:	20070612

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIYIELD INSURED FUND INC
		DATE OF NAME CHANGE:	19920717
</SEC-HEADER>
<DOCUMENT>
<TYPE>424B3
<SEQUENCE>1
<FILENAME>d48770d424b3.htm
<DESCRIPTION>BLACKROCK MUNIYIELD QUALITY FUND III, INC.
<TEXT>
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<TITLE>BlackRock MuniYield Quality Fund III, Inc.</TITLE>
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<DIV STYLE="width:8.5in" align="left">
 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="right"><B>Filed Pursuant to Rule 424(b)(3) </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="right"><B>Registration File No.: <FONT STYLE="white-space:nowrap">333-288718</FONT> </B></P>
<P STYLE="margin-top:16pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>BLACKROCK MUNIVEST FUND II, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>BLACKROCK MUNIYIELD MICHIGAN QUALITY FUND, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>BLACKROCK MUNIVEST FUND, INC. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>BLACKROCK MUNIYIELD QUALITY FUND III, INC. </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman"><B>Important Information Regarding the Joint Proxy Statement/Prospectus, dated September&nbsp;4, 2025 for BlackRock MuniVest Fund II, Inc.
(&#8220;MVT&#8221;), BlackRock MuniYield Michigan Quality Fund, Inc. (&#8220;MIY&#8221;), BlackRock MuniVest Fund, Inc. (&#8220;MVF&#8221;) and BlackRock MuniYield Quality Fund III, Inc. (&#8220;MYI&#8221; or the &#8220;Acquiring Fund&#8221;)
</B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman"><B>The following changes are made to the Joint Proxy Statement/Prospectus: </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman">The Section of the Joint Proxy Statement/Prospectus entitled &#8220;Voting Information and Requirements &#8211; Voting Requirement for Proposal 2: The
Issuance of Acquiring Fund Common Shares&#8221; is deleted in its entirety and replaced with the following information: </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; margin-left:3%; font-size:12pt; font-family:Times New Roman"><B>Voting
Requirement for Proposal 2: The Issuance of Acquiring Fund Common Shares </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0" STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:12pt" ALIGN="center">


<TR>

<TD WIDTH="49%"></TD>

<TD VALIGN="bottom" WIDTH="4%"></TD>
<TD WIDTH="47%"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:12pt">
<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Proposals</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Required Approval of<BR>Shareholders</B></P></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:12pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman"><I>Proposal 2(A)</I>: The common shareholders and VRDP Holders of the Acquiring Fund are being asked to vote as a
single class on a proposal to approve the MVT Issuance.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman">Majority of votes entitled to be cast present at the Special Meeting or represented by proxy</P></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:12pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman"><I>Proposal 2(B)</I>: The common shareholders and VRDP Holders of the Acquiring Fund are being asked to vote as a
single class on a proposal to approve the MIY Issuance.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman">Majority of votes entitled to be cast present at the Special Meeting or represented by proxy</P></TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:12pt">
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman"><I>Proposal 2(C)</I>: The common shareholders and VRDP Holders of the Acquiring Fund are being asked to vote as a
single class on a proposal to approve the MVF Issuance.</P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; margin-left:2.00em; font-size:12pt; font-family:Times New Roman">Majority of votes entitled to be cast present at the Special Meeting or represented by proxy.</P></TD></TR>
</TABLE> <P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman">All other references in the Joint Proxy Statement/Prospectus and the accompanying exhibits referencing the vote requirement
for shareholders to approve Proposals 2(A), 2(B) and 2(C) are hereby revised and restated to reflect the vote requirements stated in the table above. </P>
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