Acumen Pharmaceuticals, Inc. (ABOS) Insider Ownership

Historic Insider Ownership Trends

Over the 90-day window ending February 19, 2026, Acumen Pharmaceuticals's three dominant insider ownership positions are held by TenPercentOwner Robert D. Hardie (3.95Mn shares), TenPercentOwner Capital Ventures Discovery Fund Iii, L.P. Sands (3.42Mn shares), Chief Executive Officer Daniel Joseph Oconnell (881.27K shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares Report Date
Robert D. Hardie 3,951,156 08 Jul, 2021
Capital Ventures Discovery Fund Iii, L.P. Sands 3,417,075 08 Jul, 2021
Daniel Joseph Oconnell Chief Executive Officer 881,275 23 Jan, 2026
Paul B Manning 657,985 08 Jul, 2021
John A Iii Stalfort 316,719 05 Jun, 2025
Matt Zuga Cfo & Chief Business Officer 304,924 23 Jan, 2026
Eric Siemers Chief Medical Officer 255,371 23 Jan, 2026
James J. Doherty President And Cdo 220,900 21 Jan, 2026
Russell Barton Chief Operating Officer 205,092 23 Jan, 2026
Derek M Meisner Chief Legal Officer & Corp Sec 173,999 28 Jan, 2026
Amy Schacterle Chief Regulatory Officer 92,303 21 Jan, 2026
Nathan B Fountain 19,050 05 Jun, 2025
Laura Stoppel 12,800 05 Jun, 2025
Derrell Porter 12,800 05 Jun, 2025
Jeffrey L. Ives 12,800 05 Jun, 2025
Capital Management, L.P. Ra 12,800 05 Jun, 2025
Kimberlee C Drapkin 12,800 05 Jun, 2025

* 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
28 Jan, 2026 Derek M Meisner Common Stock A 2,671 $1.85 176,670 D M
28 Jan, 2026 Derek M Meisner Common Stock D 2,671 $3.00 173,999 D S
26 Jan, 2026 Derek M Meisner Common Stock A 15,085 $1.85 189,084 D M
26 Jan, 2026 Derek M Meisner Common Stock D 15,085 $3.00 173,999 D S
23 Jan, 2026 Derek M Meisner Common Stock D 5,633 $1.90 173,999 D S
22 Jan, 2026 Derek M Meisner Common Stock D 1,054 $1.84 179,632 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 Eric Siemers Common Stock D 895 $1.82 255,371 D S
22 Jan, 2026 Russell Barton Common Stock D 462 $1.84 205,092 D S
21 Jan, 2026 Derek M Meisner Common Stock D 2,247 $1.81 180,686 D S
21 Jan, 2026 Matt Zuga Common Stock D 2,473 $1.81 306,611 D S
21 Jan, 2026 Daniel Joseph Oconnell Common Stock D 9,346 $1.81 883,964 D S
21 Jan, 2026 Eric Siemers Common Stock D 2,331 $1.80 256,266 D S
21 Jan, 2026 Russell Barton Common Stock D 2,315 $1.81 205,554 D S
20 Jan, 2026 Daniel Joseph Oconnell Common Stock A 299,800 $0.00 893,310 D A
16 Jan, 2026 Derek M Meisner Common Stock A 99,133 $0.00 182,933 D A
16 Jan, 2026 Matt Zuga Common Stock A 99,133 $0.00 309,084 D A
16 Jan, 2026 Eric Siemers Common Stock A 99,133 $0.00 258,597 D A
16 Jan, 2026 Russell Barton Common Stock A 84,600 $0.00 207,869 D A