SCHEDULE 13G/A 0001218710 XXXXXXXX LIVE 1 Common Stock, par value $0.0001 per share 09/30/2025 0001907108 Lexeo Therapeutics, Inc. 52886X107 345 Park Avenue South, Floor 6 New York NY 10010 Rule 13d-1(b) Balyasny Asset Management L.P. DE 5394721 0 5394721 0 5394721 N 9.99 IA PN BAM GP LLC DE 5394721 0 5394721 0 5394721 N 9.99 HC OO Balyasny Asset Management Holdings LP DE 5394721 0 5394721 0 5394721 N 9.99 HC PN Dames GP LLC DE 5394721 0 5394721 0 5394721 N 9.99 HC OO Dmitry Balyasny X1 5394721 0 5394721 0 5394721 N 9.99 HC IN Lexeo Therapeutics, Inc. 345 Park Avenue South, Floor 6, New York, NY, 10010, UNITED STATES This statement is being filed by (1) Balyasny Asset Management L.P., a Delaware limited partnership ("BAM"), (2) BAM GP LLC, a Delaware limited liability company ("BAM GP"), (3) Balyasny Asset Management Holdings LP, a Delaware limited partnership ("BAM Holdings"), (4) Dames GP LLC, a Delaware limited liability company ("Dames"), and (5) Dmitry Balyasny, a United States citizen (collectively, the "Reporting Persons"). BAM GP is the General Partner of BAM. BAM Holdings is the Sole Member of BAM GP. Dames is the General Partner of BAM Holdings. Dmitry Balyasny is the Managing Member of Dames. The principal business address of each of BAM, BAM GP, BAM Holdings, Dames, and Mr. Balyasny is located at 444 West Lake Street, 50th Floor, Chicago, IL 60606. (1) BAM is a Delaware limited partnership, (2) BAM GP is a Delaware limited liability company, (3) BAM Holdings is a Delaware limited partnership, (4) Dames is a Delaware limited liability company, and (5) Mr. Balyasny is a United States citizen. N IA HC By virtue of its position as the investment manager of Atlas Diversified Master Fund, Ltd. ("ADMF"), the direct holder of the 5,394,721 shares (including 1,480,933 shares of Common Stock issuable upon exercise of Warrants) of common stock, par value $0.0001 per share ("Shares"), reported herein, BAM may be deemed to exercise voting and investment power over such Shares held by ADMF and thus may be deemed to beneficially own such Shares. By virtue of its position as the General Partner of BAM, BAM GP may be deemed to exercise voting and investment power over the Shares held directly by ADMF and thus may be deemed to beneficially own such Shares. By virtue of its position as the Sole Member of BAM GP, BAM Holdings may be deemed to exercise voting and investment power over the Shares held directly by ADMF and thus may be deemed to beneficially own such Shares. By virtue of its position as the General Partner of BAM Holdings, Dames may be deemed to exercise voting and investment power over the Shares held directly by ADMF and thus may be deemed to beneficially own such Shares. By virtue of his position as the Managing Member of Dames, Mr. Balyasny may be deemed to exercise voting and investment power over the Shares held directly by ADMF and thus may be deemed to beneficially own such Shares. The report amount consists of 3,913,788 Shares and 1,480,933 Shares issuable upon the exercise of 1,480,933 Warrants subject to the Beneficial Ownership Limitation (as defined herein). The Warrants are subject to a blocker which prevents the holder from exercising the Warrants to the extent that, upon such exercise, the holder would beneficially own in excess of 9.99% of the Shares outstanding as a result of the exercise (the "Beneficial Ownership Limitation"). Each of the Reporting Persons has the sole power to dispose or to direct the disposition of 5,394,721 Shares (including 1,480,933 shares of Common Stock issuable upon exercise of Warrants). 0 Each of the Reporting Persons has the sole power to dispose or to direct the disposition of 5,394,721 Shares (including 1,480,933 shares of Common Stock issuable upon exercise of Warrants). 0 Y N ADMF, a Cayman Islands exempted company that is an investment management client of BAM, has the right to receive dividends from, or the proceeds from the sale of, the reported securities. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. Balyasny Asset Management L.P. /s/ Scott Schroeder 11/10/2025 BAM GP LLC /s/ Scott Schroeder 11/10/2025 Balyasny Asset Management Holdings LP /s/ Scott Schroeder 11/10/2025 Dames GP LLC /s/ Scott Schroeder 11/10/2025 Dmitry Balyasny /s/ Dmitry Balyasny 11/10/2025