Acumen Pharmaceuticals, Inc. (ABOS) Insider Ownership

Historic Insider Ownership Trends

As of July 26, 2026, the three largest insider holders of ABOS are Capital Management, L.P. Ra (Director, 19.10Mn shares), Capital Management, L.P. Ra (Director, 13.04Mn shares), Robert D. Hardie (TenPercentOwner, 3.86Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Kimberlee C Drapkin - 12,800 0 05 Jun, 2025
Capital Management, L.P. Ra - 0 19,103,785 18 Mar, 2026
Jeffrey L. Ives - 12,800 0 05 Jun, 2025
Derrell Porter - 12,800 0 05 Jun, 2025
Matt Zuga Cfo Chief Business Officer 304,924 0 23 Jan, 2026
Robert D. Hardie - 0 3,859,141 08 Jul, 2021
Laura Stoppel - 12,800 0 05 Jun, 2025
Daniel Joseph Oconnell Chief Executive Officer 881,275 0 23 Jan, 2026
Eric Siemers Chief Medical Officer 255,371 0 23 Jan, 2026
Russell Barton Chief Operating Officer 205,092 0 23 Jan, 2026
Nathan B Fountain - 19,050 0 05 Jun, 2025
Capital Ventures Discovery Fund Iii, L.P. Sands - 3,417,075 0 08 Jul, 2021
James J. Doherty President And Cdo 220,900 0 21 Jan, 2026
Amy Schacterle Chief Regulatory Officer 92,303 0 21 Jan, 2026

* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
16 Mar, 2026 Capital Management, L.P. Ra Common Stock A 6,060,606 $3.30 19,103,785 I A
21 Jan, 2026 Daniel Joseph Oconnell Common Stock D 9,346 $1.81 883,964 D S
21 Jan, 2026 Matt Zuga Common Stock D 2,473 $1.81 306,611 D S
21 Jan, 2026 Russell Barton Common Stock D 2,315 $1.81 205,554 D S
21 Jan, 2026 Daniel Joseph Oconnell Common Stock D 9,346 $1.81 883,964 D S
21 Jan, 2026 Russell Barton Common Stock D 2,315 $1.81 205,554 D S
21 Jan, 2026 Matt Zuga Common Stock D 2,473 $1.81 306,611 D S
21 Jan, 2026 Eric Siemers Common Stock D 2,331 $1.80 256,266 D S
21 Jan, 2026 Eric Siemers Common Stock D 2,331 $1.80 256,266 D S
21 Jan, 2026 Eric Siemers Common Stock D 2,331 $1.80 256,266 D S
21 Jan, 2026 Daniel Joseph Oconnell Common Stock D 9,346 $1.81 883,964 D S
21 Jan, 2026 Russell Barton Common Stock D 2,315 $1.81 205,554 D S
21 Jan, 2026 Matt Zuga Common Stock D 2,473 $1.81 306,611 D S
22 Jan, 2026 Russell Barton Common Stock D 462 $1.84 205,092 D S
22 Jan, 2026 Eric Siemers Common Stock D 895 $1.82 255,371 D S
22 Jan, 2026 Eric Siemers Common Stock D 895 $1.82 255,371 D S
22 Jan, 2026 Matt Zuga Common Stock D 1,687 $1.86 304,924 D S
22 Jan, 2026 Daniel Joseph Oconnell Common Stock D 2,689 $1.88 881,275 D S
22 Jan, 2026 Matt Zuga Common Stock D 1,687 $1.86 304,924 D S
22 Jan, 2026 Daniel Joseph Oconnell Common Stock D 2,689 $1.88 881,275 D S