Acumen Pharmaceuticals, Inc. (ABOS)
Nasdaq: ABOS · Biological Products, (No Diagnostic Substances) · Newton, MA · filing with the SEC since 2013
Who owns Acumen Pharmaceuticals, Inc.
As filed with the SECHolders of 5% or more
3
RA Capital Management, L.P. holds 29.5% of Common Stock, $0.0001 par value per share, as its SCHEDULE 13D/A filed Mar 17, 2026 says.
Directors and officers
19
report now, of 20 people on the record since 2021. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 3 named at left.
Holders of 5% or moreshare of the class, as filed
RA Capital Management, L.P.
SCHEDULE 13D/A · filed Mar 17, 2026 · Common Stock, $0.0001 par value per share · 24.8% in Mar 31, 2025
Sands Capital Alternatives, LLC
SCHEDULE 13G/A · filed Aug 13, 2025 · Common Stock, par value $0.0001 per share
James B. Murray Jr.
SCHEDULE 13G · filed Apr 7, 2026 · Common Stock, $0.0001 par value per share
Franklin Resources, Inc.
SCHEDULE 13G/A · filed Nov 4, 2025 · Common stock, par value $0.0001 per share · reported falling below 5%
What ABOS reports owning in othersstakes of 5% or more, and other ties
Acumen Pharmaceuticals, Inc. reports no stake in another company in the record.
Insider tradesForm 4
48sales
0purchases
4sales on a scheduled plan
9people selling
$600,000sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window9 of 26 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Oconnell Daniel Joseph | Chief Executive Officer | 8 | $200,000 | 0 | 0 | $0 |
| Meisner Derek M | Chief Legal Officer & Corp Sec | 16 | $200,000 | 4 | 0 | $0 |
| Porter Derrell | director | 3 | $100,000 | 0 | 0 | $0 |
| Doherty James J. | President and CDO | 2 | $0 | 0 | 0 | $0 |
| Zuga Matt | CFO & Chief Business Officer | 7 | $0 | 0 | 0 | $0 |
| Barton Russell | Chief Operating Officer | 6 | $0 | 0 | 0 | $0 |
| Siemers Eric | Chief Medical Officer | 4 | $0 | 0 | 0 | $0 |
| Schacterle Amy | Chief Regulatory Officer | 1 | $0 | 0 | 0 | $0 |
| Fountain Nathan B | director | 1 | $0 | 0 | 0 | $0 |