Acumen Pharmaceuticals, Inc. (ABOS)

Latest Insider Confidence Score

2026Q1

43.3
Bearish

Company insider confidence (by quarter)

2021Q2 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Sands Capital Ventures Discovery Fund III, L.P. 10% Owner 1,842,346 Jul 8, 2021
Sands Capital Global Venture Fund II, L.P. 10% Owner 1,842,346 Jul 8, 2021
Sands Capital Life Sciences Pulse Fund, LLC 10% Owner 1,842,346 Jul 8, 2021
Sands Frank M. 10% Owner 1,842,346 Jul 8, 2021
OConnell Daniel Joseph CEO 667,488 Jan 23, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Feb 27, 2026 Mar 3, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Sell 35.6 -9,406 -5.13% ✓ $28.3K
Jan 26, 2026 Jan 28, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Sell 38.8 -17,756 -4.85% ✓ $53.3K
Jan 21, 2026 Jan 23, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Sell 40.6 -8,934 -4.88% ✓ $16.7K
Jan 21, 2026 Jan 23, 2026 Siemers Eric Chief Medical Officer Sell 48.8 -3,226 -1.25% ✓ $5.8K
Jan 21, 2026 Jan 23, 2026 Zuga Matt CFO Sell 48.8 -4,160 -1.35% ✓ $7.6K
Jan 21, 2026 Jan 23, 2026 OConnell Daniel Joseph CEO Sell 48.1 -12,035 -1.35% ✓ $22K
Jan 21, 2026 Jan 23, 2026 Barton Russell COO Sell 48.8 -2,777 -1.34% ✓ $5K
Jan 20, 2026 Jan 21, 2026 OConnell Daniel Joseph CEO Neutral 90.0 +299,800 50.51% ✗ -
Jan 16, 2026 Jan 21, 2026 Zuga Matt CFO Neutral 90.0 +99,133 47.22% ✗ -
Jan 16, 2026 Jan 21, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Neutral 90.0 +99,133 118.30% ✗ -
Jan 16, 2026 Jan 21, 2026 Siemers Eric Chief Medical Officer Neutral 90.0 +99,133 62.17% ✗ -
Jan 16, 2026 Jan 21, 2026 Barton Russell COO Neutral 90.0 +84,600 68.63% ✗ -
Jan 16, 2026 Jan 21, 2026 Schacterle Amy Chief Regulatory Officer Neutral 90.0 +84,600 1098.27% ✗ -
Jan 16, 2026 Jan 21, 2026 Doherty James J. President Neutral 90.0 +166,867 308.82% ✗ -
Jan 8, 2026 Jan 12, 2026 Zuga Matt CFO Sell 40.6 -6,888 -3.18% ✓ $12.5K
Jan 8, 2026 Jan 12, 2026 Barton Russell COO Sell 45.0 -3,530 -2.78% ✓ $6.6K
Jan 8, 2026 Jan 12, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Sell 11.3 -50,659 -37.68% ✓ $91.1K
Jan 8, 2026 Jan 12, 2026 OConnell Daniel Joseph CEO Sell 40.6 -26,472 -4.27% ✓ $47K
Jan 7, 2026 Jan 9, 2026 Doherty James J. President Sell 28.1 -8,167 -13.13% ✓ $15.1K
Jan 7, 2026 Jan 9, 2026 Schacterle Amy Chief Regulatory Officer Sell 28.8 -1,097 -12.47% ✓ $2.2K
Jan 5, 2026 Jan 7, 2026 Zuga Matt CFO Sell 35.6 -14,905 -6.43% ✓ $29.4K
Jan 5, 2026 Jan 7, 2026 Siemers Eric Chief Medical Officer Sell 35.6 -10,834 -6.36% ✓ $21.3K
Jan 5, 2026 Jan 7, 2026 OConnell Daniel Joseph CEO Sell 33.8 -47,506 -7.12% ✓ $94.2K
Jan 5, 2026 Jan 7, 2026 Meisner Derek M Chief Legal Officer & Corp Sec Sell 21.3 -26,668 -16.55% ✓ $52.7K
Jan 5, 2026 Jan 7, 2026 Barton Russell COO Sell 35.6 -9,318 -6.85% ✓ $18.3K
Nov 6, 2025 Nov 10, 2025 Golumbeski George Director Neutral 52.5 - 0.00% ✗ -
Nov 10, 2025 Golumbeski George Director Neutral 52.5 - 0.00% ✗ -
Jun 4, 2025 Jun 5, 2025 RA CAPITAL MANAGEMENT, L.P. Director Neutral 90.0 +12,800 100.00% ✗ -
Jun 4, 2025 Jun 5, 2025 Stoppel Laura Director Neutral 90.0 +12,800 100.00% ✗ -
Jun 4, 2025 Jun 5, 2025 Stalfort John A III Director Neutral 85.0 +12,800 7.43% ✗ -
Jun 4, 2025 Jun 5, 2025 Fountain Nathan B Director Neutral 90.0 +12,800 204.80% ✗ -
Jun 4, 2025 Jun 5, 2025 Drapkin Kimberlee C Director Neutral 90.0 +12,800 100.00% ✗ -
Jun 4, 2025 Jun 5, 2025 Ives Jeffrey L. Director Neutral 90.0 +12,800 100.00% ✗ -
Jun 4, 2025 Jun 5, 2025 Porter Derrell Director Neutral 90.0 +12,800 100.00% ✗ -
Jan 21, 2025 Jan 23, 2025 Zuga Matt CFO Sell 25.0 -33,266 -12.55% ✓ $56.6K
Jan 21, 2025 Jan 23, 2025 OConnell Daniel Joseph CEO Sell 48.8 -12,619 -1.86% ✓ $20.1K
Jan 21, 2025 Jan 23, 2025 Meisner Derek M Chief Legal Officer & Corp Sec Sell 46.3 -3,418 -2.08% ✓ $5.4K
Jan 21, 2025 Jan 23, 2025 Barton Russell COO Sell 46.3 -2,914 -2.10% ✓ $4.7K
Jan 21, 2025 Jan 23, 2025 Siemers Eric Chief Medical Officer Sell 50.0 -3,219 -1.86% ✓ $5.1K
Jan 3, 2025 Jan 7, 2025 OConnell Daniel Joseph CEO Sell 95.0 +177,622 35.35% ✓ $87.9K
Jan 6, 2025 Jan 7, 2025 Schacterle Amy Chief Regulatory Officer Neutral 90.0 +8,800 100.00% ✗ -
Jan 6, 2025 Jan 7, 2025 Doherty James J. President Neutral 90.0 +62,600 100.00% ✗ -
Jan 3, 2025 Jan 7, 2025 Meisner Derek M Chief Legal Officer & Corp Sec Sell 91.3 +55,678 51.14% ✓ $20.5K
Jan 3, 2025 Jan 7, 2025 Barton Russell COO Sell 91.3 +42,164 43.53% ✓ $14.2K
Jan 3, 2025 Jan 7, 2025 Zuga Matt CFO Sell 91.3 +53,565 25.33% ✓ $24.4K
Jan 3, 2025 Jan 7, 2025 Siemers Eric Chief Medical Officer Sell 91.3 +55,941 47.58% ✓ $20K
Nov 5, 2024 Nov 6, 2024 Schacterle Amy Chief Regulatory Officer Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Schacterle Amy Chief Regulatory Officer Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 RA CAPITAL MANAGEMENT, L.P. Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Ives Jeffrey L. Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Stoppel Laura Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Stalfort John A III Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Porter Derrell Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Fountain Nathan B Director Neutral 52.5 - 0.00% ✗ -
Jun 10, 2024 Jun 10, 2024 Drapkin Kimberlee C Director Neutral 52.5 - 0.00% ✗ -
Feb 1, 2024 Feb 1, 2024 Doherty James J. President Neutral 52.5 - 0.00% ✗ -
Feb 1, 2024 Doherty James J. President Neutral 52.5 - 0.00% ✗ -
Jan 19, 2024 Jan 19, 2024 OConnell Daniel Joseph CEO Sell 41.3 -15,200 -2.94% ✓ $52.8K
Jan 19, 2024 Jan 19, 2024 Meisner Derek M Chief Legal Officer & Corp Sec Sell 32.5 -8,933 -7.58% ✓ $31K
Jan 18, 2024 Jan 19, 2024 Zuga Matt CFO Sell 48.8 -4,242 -1.97% ✓ $15.7K
Jan 18, 2024 Jan 19, 2024 Siemers Eric Chief Medical Officer Sell 45.0 -3,124 -2.59% ✓ $11.6K
Jan 18, 2024 Jan 19, 2024 Barton Russell COO Sell 45.0 -2,833 -2.84% ✓ $10.6K
Jan 2, 2024 Jan 4, 2024 Barton Russell COO Neutral 90.0 +73,000 273.41% ✗ -
Jan 2, 2024 Jan 4, 2024 Meisner Derek M Chief Legal Officer & Corp Sec Neutral 90.0 +91,000 339.55% ✗ -
Jan 2, 2024 Jan 4, 2024 Siemers Eric Chief Medical Officer Neutral 90.0 +94,000 352.06% ✗ -
Jan 2, 2024 Jan 4, 2024 Zuga Matt CFO Neutral 90.0 +106,000 96.64% ✗ -
Jan 2, 2024 Jan 4, 2024 OConnell Daniel Joseph CEO Neutral 90.0 +401,000 343.66% ✗ -
Aug 17, 2023 Aug 18, 2023 Ives Jeffrey L. Director Sell 7.5 -41,949 -100.00% ✓ $272.3K
Jul 21, 2023 Jul 25, 2023 RA CAPITAL MANAGEMENT, L.P. Director Buy 100.0 +5,161,290 65.48% ✗ $40M
Jun 6, 2023 Jun 13, 2023 RA CAPITAL MANAGEMENT, L.P. Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Stalfort John A III Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Stoppel Laura Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Porter Derrell Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Ives Jeffrey L. Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Fountain Nathan B Director Neutral 52.5 - 0.00% ✗ -
Jun 6, 2023 Jun 7, 2023 Drapkin Kimberlee C Director Neutral 52.5 - 0.00% ✗ -
Jan 17, 2023 Jan 18, 2023 Zuga Matt CFO Neutral 90.0 +33,500 43.97% ✗ -
Jan 17, 2023 Jan 18, 2023 Siemers Eric Chief Medical Officer Neutral 90.0 +26,700 100.00% ✗ -
Jan 17, 2023 Jan 18, 2023 OConnell Daniel Joseph CEO Neutral 90.0 +114,000 4245.81% ✗ -
Jan 17, 2023 Jan 18, 2023 Meisner Derek M Chief Legal Office & Corp Sec Neutral 90.0 +26,800 100.00% ✗ -
Jan 17, 2023 Jan 18, 2023 Barton Russell COO Neutral 90.0 +26,700 100.00% ✗ -
Jan 4, 2023 Jan 4, 2023 Porter Derrell Director Neutral 52.5 - 0.00% ✗ -
Jan 4, 2023 Porter Derrell Director Neutral 52.5 - 0.00% ✗ -
Dec 29, 2022 Jan 3, 2023 Zuga Matt CFO Neutral 52.5 - 0.00% ✗ -
Sep 6, 2022 Sep 7, 2022 Meisner Derek M Chief Legal Office & Corp Sec Neutral 52.5 - 0.00% ✗ -
Sep 7, 2022 Meisner Derek M Chief Legal Office & Corp Sec Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 21, 2022 RA CAPITAL MANAGEMENT, L.P. Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Fountain Nathan B Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Stoppel Laura Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Ives Jeffrey L. Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Stalfort John A III Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Sevigny Jeffrey Director Neutral 52.5 - 0.00% ✗ -
Jun 15, 2022 Jun 17, 2022 Drapkin Kimberlee C Director Neutral 52.5 - 0.00% ✗ -
Apr 1, 2022 Apr 4, 2022 Drapkin Kimberlee C Director Neutral 52.5 - 0.00% ✗ -
Apr 4, 2022 Drapkin Kimberlee C Director Neutral 52.5 - 0.00% ✗ -
Jan 19, 2022 Jan 21, 2022 Zuga Matt CFO Neutral 52.5 - 0.00% ✗ -
Jan 19, 2022 Jan 21, 2022 Siemers Eric Chief Medical Officer Neutral 52.5 - 0.00% ✗ -
Jan 19, 2022 Jan 21, 2022 OConnell Daniel Joseph CEO Neutral 52.5 - 0.00% ✗ -
Jan 19, 2022 Jan 21, 2022 Barton Russell COO Neutral 52.5 - 0.00% ✗ -
Nov 30, 2021 Dec 2, 2021 OConnell Daniel Joseph CEO Neutral 52.5 - 0.00% ✗ -