Joinder, dated November 22, 2023, between the Company and Harry L. You, to the Letter Agreement, dated June 22, 2021, by and among the Company, its officers and directors and the Previous Sponsor

Exhibit 10.3

JOINDER AGREEMENT

Reference is hereby made to that certain Letter Agreement, dated as of June 22, 2021 (the “Letter Agreement”) by and among Coliseum Acquisition Corp., a Cayman Islands exempted company (the “Company”), Coliseum Acquisition Sponsor LLC, a Delaware limited liability company (the “Sponsor”) and other parties named in the Letter Agreement (each an “Insider” and collectively, the “Insiders”).

Harry L. You owns 2,624,999 Class A ordinary shares, par value $0.001 per share and 1 Class B ordinary share, par value $0.001 per share, of the Company (the “Founder Shares”) and, as an Insider, the undersigned hereby acknowledge and agree that, upon execution of this Joinder Agreement, Harry L. You shall become a party to the Letter Agreement and shall be bound by all terms, conditions and covenants of the Letter Agreement in the same manner as if Harry L. You were an original signatory to the Letter Agreement. Harry L. You agrees that for all purposes of the Letter Agreement, he shall be included within the defined term “Insider.”

Capitalized terms used but not defined herein shall have the meanings given to such terms in the Letter Agreement.

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November  22, 2023

[signature page to follow]

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[Signature page to Joinder (Letter Agreement)]

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[Signature page to Joinder (Letter Agreement)]