RA Capital Management, L.P. and Affiliates File Schedule 13G for Lexeo Therapeutics, Inc.

RA Capital Management, L.P., along with Peter Kolchinsky, Rajeev Shah, and RA Capital Healthcare Fund, L.P., filed a Schedule 13G with the SEC on October 27, 2025, disclosing their beneficial ownership of 5,000,000 shares of Lexeo Therapeutics, Inc.'s common stock, representing 6.9% of the outstanding shares. The filing indicates that RA Capital Management serves as the investment adviser for RA Capital Healthcare Fund, L.P., which directly holds the shares. The filing also notes that RA Capital Management, Peter Kolchinsky, and Rajeev Shah disclaim beneficial ownership of the shares except for the purpose of determining their obligations under Section 13(d) of the Securities Exchange Act of 1934. The filing is made pursuant to Rule 13d-1(c) and includes a joint filing agreement among the reporting persons.