Daniel Joseph O'Connell, CEO of Acumen Pharmaceuticals ($ABOS), sold shares on the open market eight times over the past year, totaling about $163 thousand. His most recent sale occurred on January 22, 2026. These sales rank 8,833rd among 11,678 individual insiders in our database, where the average is $8.6 million across about 6.4 transactions. He made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan. 21, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 9346 | $1.81 | 883,964.0000 | 60,573,425 | 1.05% | 0.02% |
| Jan. 22, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 2689 | $1.88 | 881,275.0000 | 60,573,425 | 0.30% | 0.00% |
| Jan. 20, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | A | Employee Stock Option (right to buy) | 450000 | $0.00 | 450,000.0000 | 60,573,425 | 9999.99% | 0.74% |
| Jan. 20, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | A | Common Stock | 299800 | $0.00 | 893,310.0000 | 60,573,425 | 50.51% | 0.49% |
| Jan. 9, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 12941 | $1.76 | 598,898.0000 | 60,573,425 | 2.12% | 0.02% |
| Jan. 12, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 5388 | $1.73 | 593,510.0000 | 60,573,425 | 0.90% | 0.01% |
| Jan. 8, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 8143 | $1.82 | 611,839.0000 | 60,573,425 | 1.31% | 0.01% |
| Jan. 5, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 4649 | $1.97 | 662,839.0000 | 60,573,425 | 0.70% | 0.01% |
| Jan. 6, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 5102 | $1.97 | 657,737.0000 | 60,573,425 | 0.77% | 0.01% |
| Jan. 7, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 37755 | $1.99 | 619,982.0000 | 60,573,425 | 5.74% | 0.06% |
| Jan. 21, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 12619 | $1.59 | 667,488.0000 | 0 | 1.86% | 0.00% |
| Jan. 3, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | S | Common Stock | 47778 | $1.84 | 454,707.0000 | 0 | 9.51% | 0.00% |
| Jan. 7, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | A | Common Stock | 225400 | $0.00 | 680,107.0000 | 0 | 49.57% | 0.00% |
| Jan. 7, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | Chief Executive Officer | A | Employee Stock Option (right to buy) | 338000 | $0.00 | 338,000.0000 | 0 | 9999.99% | 0.00% |
| Jan. 19, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | President and CEO | S | Common Stock | 15200 | $3.47 | 502,485.0000 | 0 | 2.94% | 0.00% |
| Jan. 2, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | President and CEO | A | Common Stock | 401000 | $0.00 | 517,685.0000 | 0 | 343.66% | 0.00% |
| Jan. 2, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | President and CEO | A | Employee Stock Option (right to buy) | 602000 | $0.00 | 602,000.0000 | 0 | 9999.99% | 0.00% |
| Jan. 17, 2023 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | President and CEO | A | Common Stock | 114000 | $0.00 | 116,685.0000 | 0 | 4245.81% | 0.00% |
| Jan. 17, 2023 | Acumen Pharmaceuticals, Inc. | $ABOS | OConnell Daniel Joseph | President and CEO | A | Employee Stock Option (right to buy) | 472500 | $0.00 | 472,500.0000 | 0 | 9999.99% | 0.00% |