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).
| 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.
| 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 |