Eric Siemers, Chief Medical Officer of Acumen Pharmaceuticals ($ABOS), made four open market sales of company shares over the last year, totaling $27,110. His most recent ABOS insider sale occurred on January 22, 2026. These transactions rank 10,876th out of 11,678 individual insiders by sale value, well below the average of $8.6 million and 6.4 sales per insider. Siemers had 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. 22, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 895 | $1.82 | 255,371.0000 | 60,573,425 | 0.35% | 0.00% |
| Jan. 21, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 2331 | $1.80 | 256,266.0000 | 60,573,425 | 0.90% | 0.00% |
| Jan. 16, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Employee Stock Option (right to buy) | 148700 | $0.00 | 148,700.0000 | 60,573,425 | 9999.99% | 0.25% |
| Jan. 16, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Common Stock | 99133 | $0.00 | 258,597.0000 | 60,573,425 | 62.17% | 0.16% |
| Jan. 5, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 4000 | $1.96 | 166,298.0000 | 60,573,425 | 2.35% | 0.01% |
| Jan. 6, 2026 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 6834 | $1.97 | 159,464.0000 | 60,573,425 | 4.11% | 0.01% |
| Jan. 21, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 3219 | $1.59 | 170,298.0000 | 0 | 1.86% | 0.00% |
| Jan. 6, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Employee Stock Option (right to buy) | 100300 | $0.00 | 100,300.0000 | 0 | 9999.99% | 0.00% |
| Jan. 3, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 10859 | $1.85 | 106,717.0000 | 0 | 9.24% | 0.00% |
| Jan. 6, 2025 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Common Stock | 66800 | $0.00 | 173,517.0000 | 0 | 62.60% | 0.00% |
| Jan. 18, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | S | Common Stock | 3124 | $3.71 | 117,576.0000 | 0 | 2.59% | 0.00% |
| Jan. 2, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Common Stock | 94000 | $0.00 | 120,700.0000 | 0 | 352.06% | 0.00% |
| Jan. 2, 2024 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Employee Stock Option (right to buy) | 141000 | $0.00 | 141,000.0000 | 0 | 9999.99% | 0.00% |
| Jan. 17, 2023 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Common Stock | 26700 | $0.00 | 26,700.0000 | 0 | 9999.99% | 0.00% |
| Jan. 17, 2023 | Acumen Pharmaceuticals, Inc. | $ABOS | Siemers Eric | Chief Medical Officer | A | Employee Stock Option (right to buy) | 120200 | $0.00 | 120,200.0000 | 0 | 9999.99% | 0.00% |