X0206 3 2021-01-27 0 0001834032 Constellation Acquisition Corp I CSTA 0001841973 Banziger Hugo 181 WESTCHESTER AVENUE SUITE 407A PORT CHESTER NY 10573 1 0 0 0 Class B ordinary shares Class A ordinary shares 43125 D The Reporting Person holds 43,125 Class B ordinary shares of the Issuer ("Class B Shares"). The Class B Shares will automatically convert into Class A ordinary shares of the Issuer ("Class A Shares") at a ratio of no less than one-to-one on the first business day following the consummation of the Issuer's initial business combination, with the actual such conversion rate as described in the section entitled "Description of Securities" in the Issuer's Registration Statement on Form S-1 (File No. 333-251974) filed with the Securities and Exchange Commission on January 22, 2021. The Class B Shares have no expiration date. Up to 5,625 of the Class B Shares held by the Reporting Person are subject to forfeiture in the event the underwriters' over-allotment option is not exercised. /s/ Hugo Banziger 2021-01-27