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 September 2025

Commission File Number: 001-42370

MEGA MATRIX INC.

Level 21, 88 Market Street

CapitaSpring

Singapore 048948

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F ☒ Form 40-F ☐

Explanatory Note

Mega Matrix Inc. (the “Company”) is furnishing this Form 6-K to provide its quarter financial statements and to incorporate such financial statements into the Company’s registration statements referenced below.

Incorporation by Reference

This report and exhibits shall be deemed to be incorporated by reference in the registration statements on Form S-8 (File No. 333-277227), Form F-3 (File No. 333-283739), Form S-8 (File No. 333-289715) and Form F-3 (File No. 333-290026), each as filed with the Securities and Exchange Commission, to the extent not superseded by documents or reports subsequently filed.

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Exhibit Index

Exhibit No. |  | Exhibit Description
99.1 |  | Unaudited Interim Consolidated Financial Statements for the Three and Six Months Ended June 30, 2025 and 2024.
99.2 |  | Management’s Discussion and Analysis of Financial Condition and Results of Operations in connection with the Unaudited Interim Consolidated Financial Statements for the Three and Six Months Ended June 30, 2025 and 2024.
101.INS |  | Inline XBRL Instance Document
101.SCH |  | Inline XBRL Taxonomy Extension Schema Document
101.CAL |  | Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF |  | Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB |  | Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE |  | Inline XBRL Taxonomy Extension Presentation Linkbase Document
104 |  | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

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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, thereunto duly authorized.

| Mega Matrix Inc.
| By: | /s/ Yucheng Hu
|  | Yucheng Hu
|  | Chief Executive Officer
Dated: September 29, 2025 |  |

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