SEC Insider Transactions from Siemers Eric.

Last updated: 2026-03-14 11:45 UTC | Total transactions: 15

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.

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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%