X0508 4 2024-02-23 0001877939 Castellum, Inc. CTM 0001946870 Buckhout Laurie M 210 BLAIR COURT EDENTON NC 27932 true false Common Stock, par value $0.0001 per share 16290 D Convertible Promissory Note 2024-02-23 4 J 0 0 A Common Stock, par value $0.0001 per share 0 I By Buckhout Charitable Remainder Trust The Buckhout Charitable Remainder Trust, Laurie Buckhout, TTEE, formerly was the holder of a convertible promissory note ( Promissory Note) in the principal amount of $3.7 million, with a maturity date of September 30, 2024, convertible into Common Stock at $0.26 per share. In connection with the amendment and restatement of the Promissory Note on February 22, 2024, the principal amount was repaid in part, monthly payments were scheduled, the term of the Promissory Note was extended and the convertibility feature was removed. Therefore, at the effective time of the amendment and restatement, the Promissory Note ceased to be, and the Reporting Person ceased to hold a derivative security . /s/ Buckhout Laurie M 2024-02-23