X0609 4 2026-09-10 0 0002104391 Catalyst Acquisition Corp. CATLU 0002146403 Catalyst Sponsor LLC false C/O CATALYST ACQUISITION CORP. 1007 OCEAN AVENUE, SUITE 501 SANTA MONICA CA 90403 0 0 1 0 0 Class B Ordinary Shares 2026-09-10 4 J 0 462500 D Class A Ordinary Shares 462500 5287500 D As described in the registration statement on Form S-1 (File No. 333-297309) of Catalyst Acquisition Corp. (the "Issuer") under the heading "Description of Securities--Founder Shares," the Class B Ordinary Shares will automatically convert into Class A Ordinary Shares at the time of the Issuer's initial business combination, or at any time prior to the Issuer's initial business combination, at the option of the holder, on a one-for-one basis, subject to certain adjustments. The Class B ordinary shares have no expiration date. No consideration is payable upon conversion. As contemplated in connection with the initial public offering of the Issuer, as a result of the underwriters' partial exercise of the over-allotment option, 462,500 Class B Ordinary Shares were surrendered by Catalyst Sponsor LLC (the "Sponsor") to the Issuer for no consideration. /s/ Steven P. Beeks, as managing member of Catalyst Sponsor LLC 2026-09-14