Additional Proxy Soliciting Materials (Form DEFA14A)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

BLACKROCK MUNIYIELD PENNSYLVANIA QUALITY FUND

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if Other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

Your Voice, Your Vote BlackRock MuniYield Pennsylvania Quality Fund (MPA) Why am I receiving this letter? You are a shareholder entitled to vote at the upcoming special shareholder meeting on October 15, 2025: Why should I vote? The Board approved the combination of six funds, including your fund, which is expected to result in potential benefits for you as a shareholder, including: Your income is expected to go up and Your after-tax yield is expected to go up 5.04% 8.52% 4.16% 7.42% Net Earnings Yield on NAV 1 Tax-Equivalent Yield 2 Pre Post Pre Post Vote now to reduce costs and to stop receiving solicitation notices Voting is simple Vote online By scanning the QR code or using the website provided on the enclosed proxy card or voting instruction form Vote by phone By calling the toll-free number on the enclosed proxy card or voting instruction form or downloading the ProxyVote app Vote by mail By completing and returning the enclosed proxy card or voting instruction form in the pre-paid envelope provided If you have any questions on how to vote or about the proposals to be voted on, please contact Georgeson LLC at 1-833-880-9327 Earnings Yield is calculated by annualizing the three-month average net earnings over net asset value as of July 31, 2025. Tax Equivalent Yield is the annualized earnings yield divided by one minus the maximum tax rate, which is 43.87% pre-merger and 40.80% post-merger.

The proxy materials previously sent to you contain important information, please read them carefully. Copies of the Proxy Statement are available for free on the Securities and Exchange Commission's website at www.sec.gov or by visiting WWW.PROXY-DIRECT.COM/BLK-34669 or by calling Georgeson LLC, the Funds' proxy solicitor, toll free at 1-833-880-9327. Important information about the Fund This material is not an advertisement and is intended for existing shareholder use only. This document and the information contained herein relates solely to BlackRock MuniYield Pennsylvania Quality Fund (MPA). The information contained herein does not relate to, and is not relevant to, any other fund or product sponsored or distributed by BlackRock or any of its affiliates. This document is not an offer to sell any securities and is not a solicitation of an offer to buy any securities. Common shares for the closed-end fund identified above are only available for purchase and sale at current market price on a stock exchange. A closed-end fund's dividend yield, tax-equivalent yield, market price and net asset value (NAV) will fluctuate with market conditions. The information for this Fund is provided for informational purposes only and does not constitute a solicitation of an offer to buy or sell Fund shares. Performance results reflect past performance and are no guarantee of future results. Current performance may be lower or higher than the performance data quoted. All returns assume reinvestment of all dividends. The market value and NAV of a fund's shares will fluctuate with market conditions. Closed-end funds may trade at a premium to NAV but often trade at a discount. BlackRock, Inc. or its affiliates. All Rights Reserved. BLACKROCK is a trademark of BlackRock, Inc., or its affiliates. All other trademarks are those of their respective owners.