Company: MYI
Filing Date: 2025-07-16
Form Type: N-14 8C
Source: 0001193125-25-159991
Chunk: 36

Company: BLACKROCK MUNIYIELD QUALITY FUND III, INC.
Filing Date: 2025-07-16
Form: N-14 8C
Chunk 36
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 not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This Joint Proxy Statement/Prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED JULY [● ], 2025

JOINT PROXY STATEMENT/PROSPECTUS

Dated [●], 2025

BLACKROCK MUNIVEST FUND II, INC.

BLACKROCK MUNIYIELD MICHIGAN QUALITY FUND, INC.

BLACKROCK MUNIVEST FUND, INC.

BLACKROCK MUNIYIELD QUALITY FUND III, INC.

100 Bellevue Parkway

Wilmington, Delaware 19809

(800) 882-0052

This Joint Proxy Statement/Prospectus is furnished to you as a common shareholder of BlackRock MuniVest Fund II, Inc. (NYSE Ticker: MVT)
(“MVT”), BlackRock MuniYield Michigan Quality Fund, Inc. (NYSE Ticker: MIY) (“MIY”), BlackRock MuniVest Fund, Inc. (NYSE Ticker: MVF) (“MVF”) and BlackRock MuniYield Quality Fund III, Inc. (NYSE Ticker: MYI)
(“MYI” or the “Acquiring Fund,” and collectively with MVT, MIY and MVF, the “Funds,” and each, a “Fund”) in connection with the solicitation of proxies by each Fund’s Board of Directors (each, a
“Board,” the members of which are referred to as “Board Members”). Each of MVT, MIY and MVF may be referred to herein individually as a “Target Fund” or collectively as the “Target Funds.” The proxies will be
voted at the joint special meeting of the shareholders of each Fund and at any and all adjournments, postponements and delays thereof (the “Special Meeting”). The Special Meeting will be held on October 15, 2025 at [●] (Eastern
Time) to consider the proposals set forth below and discussed in greater detail elsewhere in this Joint Proxy Statement/Prospectus. The Special Meeting will be held in a virtual meeting format only. Shareholders will not have to travel to attend the
Special Meeting, but will be able to view the meeting live, have a meaningful