Exhibit 13.1
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States Code), the undersigned officer of MasterBeef Group, a Cayman Islands exempted company limited by shares (the “Corporation”), does hereby certify, to such officer’s knowledge, that:
| (1) | The Annual Report on Form 20-F for the fiscal year ended December 31, 2025 (the “Form 20-F”) of the Corporation fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and | |
| (2) | The information contained in the Form 20-F fairly presents, in all material respects, the financial condition and results of operations of the Corporation. |
Date: May 15, 2026
| /s/ Ka Chun Lam | |
| Ka Chun Lam, Chief Executive Officer |