RA Capital Management Reports New 6.3% Stake in Aclaris Therapeutics, Inc.

On April 7, 2026, RA Capital Management, L.P., along with Peter Kolchinsky, Rajeev Shah, and RA Capital Healthcare Fund, L.P., filed a Schedule 13G disclosing a new 6.3% ownership stake in Aclaris Therapeutics, Inc. (ACRS). The reporting persons collectively hold 7,626,705 shares of common stock. RA Capital Healthcare Fund, L.P. directly holds the shares, while RA Capital Management, L.P. serves as the investment adviser with delegated voting and dispositive power. Peter Kolchinsky and Rajeev Shah are the controlling persons of RA Capital Management GP, LLC, the general partner of RA Capital. The filing indicates that the shares were acquired for investment purposes and not with the intent to change or influence the control of the issuer. This position represents a significant new holding for the group, as the previous reported ownership was 0%. The percentage of ownership is based on approximately 120.6 million shares outstanding as of January 30, 2026.