UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13A-16 OR 15D-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of December, 2025
Commission File Number: 001-35627

MANCHESTER UNITED PLC

(Translation of registrant’s name into English)

Old Trafford

Manchester M16 0RA

United Kingdom

(Address of principal executive offices)

Indicateby check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.Form 20-F x Form 40-F ¨

Indicateby check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1). ¨

Indicateby check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7). ¨

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934,the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date: December 5, 2025

EXHIBIT INDEX

Exhibit 99.1

Manchester Unitedplc Announces First Quarter

Fiscal 2026 EarningsReport Date

MANCHESTER, England– (BUSINESS WIRE) – 5 December 2025 – Manchester United plc (NYSE: MANU), announces that it will report results forthe first quarter fiscal 2026 period ended 30 September 2025 via press release on 11 December 2025 at 7:00 AM EST.

About Manchester United

Manchester Unitedis one of the most popular and successful sports teams in the world, playing one of the most popular spectator sports on Earth. Throughour 148-year football heritage we have won 69 trophies, enabling us to develop what we believe is one of the world’s leading sportsand entertainment brands with a global community of 1.1 billion fans and followers, per latest available survey data from 2019. Our large,passionate, and highly engaged fan base provides Manchester United with a worldwide platform to generate significant revenue from multiplesources, including sponsorship, merchandising, product licensing, broadcasting and matchday initiatives which in turn, directly fundour ability to continuously reinvest in the club.

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