Table of Contents As filed with the Securities and Exchange Commission on April 9, 2024 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT Under The Securities Act of 1933 LEXEO THERAPEUTICS, INC. (Exact name of Registrant as specified in its charter) Delaware 2836 85-4012572 (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) ...

Table of Contents As filed with the Securities and Exchange Commission on November 1, 2023 Registration No. 333-274777 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Lexeo Therapeutics, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2836 85-4012572 (Primary Standard Industrial Classification Code Number) (I.R.S. Empl ...

Table of Contents As filed with the Securities and Exchange Commission on October 30, 2023 Registration No. 333-274777 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Lexeo Therapeutics, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2836 85-4012572 (Primary Standard Industrial Classification Code Number) (I.R.S. Empl ...

Table of Contents As filed with the Securities and Exchange Commission on September 29, 2023 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 Lexeo Therapeutics, Inc. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2836 85-4012572 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification No. ...