8-K

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): December 18, 2025

MILLS MUSIC TRUST

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (212) 525-1349

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

On December 18, 2025 Mills Music Trust issued a report to its Unit Holders containing computation details regarding, among other things, the payments it received in the fourth quarter of 2025. The full text of the report is included as Exhibit 99.1 to this Current Report on Form 8-K.

(d) Exhibits:

SIGNATURES

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 hereunto duly authorized.

EX-99.1

Exhibit 99.1

MILLS MUSIC TRUST

C/OHSBC BANKS U.S.A.

66 HUDSON BLVD EAST

NEW YORK, NY 10001

December 18, 2025

Quarterly Distribution Report No. 244

To the holders (the “Unit Holders”) of Trust Certificates representing interests (the “Trust Units”) in Mills Music Trust (the “Trust”):

Enclosed you will find a check representing your share of a distribution by the Trust to the Unit Holders of record at the close of business on December 17, 2025.

This Quarterly Distribution Report relates to (i) two payments received by the Trust from Sony Music Publishing during the fourth quarter of 2025, consisting of the contingent portion payment attributable to royalty income generated by the Trust’s copyright catalogue during the third quarter of 2025 (the “Contingent Portion Payment”) and the audit settlement payment attributable to the audit settlement agreement entered into by the Trust, EMI Mills Music Inc. and EMI Consortium Music Publishing Inc on October 30, 2025 (the “Audit Settlement Payment”), and (ii) the release by the Trustees during the fourth quarter of 2025 of the entire cash reserve established to fund potential future administrative expenses and liabilities incurred by the Trust (the “Reserve”).

The Trust received (i) $250,000 ($0.9002 per Trust Unit) for the Contingent Portion Payment, as compared to $241,778 ($0.8706 per Trust Unit) for the contingent portion payment attributable to the third quarter of 2024, and (ii) $500,000 ($1.8004 per Trust Unit) for the Audit Settlement Payment. In addition, the Trustees released for distribution to the Unit Holders the entire Reserve in the aggregate amount of $377,109 ($1.3579 per Trust Unit).

After receiving the Contingent Portion Payment and the Audit Settlement Payment, and releasing the Reserve, the Trust paid $474,292 to third parties in connection with invoices rendered to the Trust, leaving a balance of $652,817 ($2.3506 per Trust Unit). Such balance is being distributed to the Unit Holders of record as of the close of business on December 17, 2025.

During the twelve month period ended December 31, 2025, the Trust’s aggregate distributions will amount to $652,817 ($2.3506 per Trust Unit), as compared to $658,733 ($2.372 per Trust Unit) during the twelve month period ended December 31, 2024.

Additional computation details are set forth in the attached report.

The information contained in this Quarterly Distribution Report will be disclosed on a Form 8-K filed with the Securities and Exchange Commission (the “SEC”). The Trust’s SEC filings are available to the public over the internet on the SEC’s web site at http://www.sec.gov.

The following is a computation of amounts available for distribution and/or the payment of administrative expenses of the Trust during the three months and twelve months ended December 31, 2025 and December 31, 2024 out of payments made to the Trust in connection with a deferred contingent purchase price obligation under the asset purchase agreement, dated December 5, 1964: