Rock Springs Capital ACRS Position
Active7-Fund ConvergenceRock Springs Capital trimmed their position in Aclaris Therapeutics Inc. (ACRS) in Q4 2025, holding $13.4M worth of shares across 4,453,741 shares.
The position was first reported in Q1 2023 and has been tracked across 12 quarterly 13F filings.
ACRS is a convergence signal: 7 specialist biotech funds hold this stock, suggesting high institutional conviction.
There is an upcoming Phase 2 readout for ATI-045 in 137 days (Aug 31, 2026), making the timing of Rock Springs's position particularly relevant.
About Aclaris Therapeutics Inc.
Aclaris Therapeutics, Inc. operates a clinical-stage biopharmaceutical company, develops novel drug candidates for immune-inflammatory diseases in the United States. It operates through two segments: Therapeutics and Contract Research. The Therapeutics segment is involved in identifying and developing innovative therapies to address significant unmet needs for immuno-inflammatory diseases. The Contract Research segment engages in the provision of laboratory services. The company also develops Zunsemetinib, an MK2 inhibitor for the treatment of moderate to severe rheumatoid and Psoriatic arthritis, and Hidradenitis suppurativa; and ATI-1777, a soft JAK 1/3 inhibitor for the treatment of moderate to severe atopic dermatitis. In addition, it develops ATI-2138, an ITK/TXK/JAK3 inhibitor as a potential treatment for T cell-mediated autoimmune diseases; Gut-Biased Program for inflammatory bowel disease; and ATI-2231, an MK2 inhibitor treatment for pancreatic and metastatic breast cancer. The company was incorporated in 2012 and is headquartered in Wayne, Pennsylvania.
Full company profile →Short Interest
4.5%
1.8 days to cover
Rock Springs Capital ACRS Position History
| Quarter | Action | Shares | Change | Value |
|---|---|---|---|---|
| Q4 2025 | Decreased | 4,453,741 | -155,568 | $13.4M |
| Q3 2025 | Decreased | 4,609,309 | -160,000 | $8.8M |
| Q2 2025 | Decreased | 4,769,309 | -277,000 | $6.8M |
| Q1 2025 | Decreased | 5,046,309 | -1,158,000 | $7.7M |
| Q4 2024 | Increased | 6,204,309 | +3,450,814 | $15.4M |
| Q3 2024 | Held | 2,753,495 | — | $3.2M |
| Q2 2024 | Held | 2,753,495 | — | $3.0M |
| Q1 2024 | Decreased | 2,753,495 | -245,000 | $3.4M |
| Q4 2023 | Decreased | 2,998,495 | -961,954 | $3.1M |
| Q3 2023 | Decreased | 3,960,449 | -1,400 | $27.1M |
| Q2 2023 | Held | 3,961,849 | — | $41.1M |
| Q1 2023 | New | 3,961,849 | +3,961,849 | $32.1M |
Frequently Asked Questions
Does Rock Springs Capital own ACRS?
Yes. As of Q4 2025, Rock Springs Capital holds 4,453,741 shares of Aclaris Therapeutics Inc. (ACRS) valued at $13.4M. This data comes from their SEC 13F filing.
How many hedge funds own ACRS?
7 specialist biotech hedge funds currently hold ACRS, including BVF Partners, RA Capital Management, Foresite Capital and 3 more. When 3 or more specialist funds hold the same stock, BiotechEdge flags it as a convergence signal.
When did Rock Springs Capital first buy ACRS?
Rock Springs Capital's position in ACRS was first reported in Q1 2023. 13F filings are reported with a 45-day delay, so the actual purchase may have occurred earlier in the quarter.
Is Rock Springs Capital's ACRS position increasing or decreasing?
Rock Springs Capital trimmed their ACRS position in the most recent quarter, reducing by 155,568 shares.
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