RA Capital Healthcare Fund LP 4
4 · Acumen Pharmaceuticals, Inc. · Filed Mar 18, 2026
Research Summary
AI-generated summary of this filing
Acumen Pharmaceuticals (ABOS) 10% Owner RA Capital Receives Award
What Happened
RA Capital Management, L.P. (reported as a 10% owner) acquired 6,060,606 shares of Acumen Pharmaceuticals, Inc. (ABOS) on 2026-03-16 via a grant/award (transaction code A). The shares were priced at $3.30 each, for a total reported value of $20,000,000. This is an acquisition (purchase/award) rather than a sale.
Key Details
- Transaction date: 2026-03-16; filing date: 2026-03-18 (filed within typical Form 4 timing).
- Price and amount: 6,060,606 shares @ $3.30 per share = $20,000,000.
- Transaction type: A (Grant, award or other acquisition).
- Shares owned after transaction: Not specified in the excerpt provided.
- Footnotes: Shares are held directly by RA Capital Healthcare Fund, L.P.; other related vehicles include RA Capital Nexus Fund II, L.P. and a separately managed account. The adviser (RA Capital Management, L.P.), its GP, and certain individuals disclaim beneficial ownership except to the extent of pecuniary interest.
- Remark: Laura Stoppel, a Principal of the Adviser, serves on Acumen’s board of directors.
Context
This filing reports an institutional-level acquisition by RA Capital’s funds/adviser — not an individual executive buy/sell. Institutional grants or acquisitions can reflect fund investment activity (financing, allocation, or compensation) rather than personal trading by company insiders. The presence of a fund principal on Acumen’s board is disclosed; the filing’s footnotes clarify how ownership and control are structured.
Insider Transaction Report
- Award
Common Stock
[F1][F2]2026-03-16$3.30/sh+6,060,606$20,000,000→ 19,103,785 total(indirect: See footnotes)
- 1,300,034(indirect: See footnotes)
Common Stock
[F2][F3] - 588,850(indirect: See footnotes)
Common Stock
[F2][F4]
Footnotes (4)
- [F1]Held directly by RA Capital Healthcare Fund, L.P. (the "Fund").
- [F2]RA Capital Management, L.P. (the "Adviser") is the investment manager for the Fund, RA Capital Nexus Fund II, L.P. (the "Nexus Fund II") and a separately managed account (the "Account"). The general partner of the Adviser is RA Capital Management GP, LLC (the "Adviser GP"), of which Dr. Peter Kolchinsky and Mr. Rajeev Shah are the managing members. Each of the Adviser, the Adviser GP, the Fund, the Nexus Fund II, Dr. Kolchinsky, and Mr. Shah disclaims beneficial ownership of any of the reported securities, except to the extent of its or his respective pecuniary interest therein.
- [F3]Held directly by the Nexus Fund II.
- [F4]Held directly by the Account.