Derek M. Meisner is CLO & Secretary at Acumen Pharmaceuticals, Inc. (ABOS). They have made 5 open-market trades across 2 companies since 2020, most recently 2026-03-06.
CIK 0001752461
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 5 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| XFOR | 161,821 | $419K |
| ABOS | 176,089 | $298K |
| Total | $717K |
Shares reported on the most recent Form 4, priced at the 2026-03-10 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ABOS | SELL | 2026-03-06 | 2026-03-10 | $3.26 | $7K | -20.6% | -25.2% | -35.6% |
| ABOS | SELL · 10b5-1 | 2026-02-27 | 2026-03-03 | $3.01 | $28K | -2.7% | -19.3% | -25.1% |
| ABOS | SELL | 2026-01-26 | 2026-01-28 | $3.00 | $53K | -13.3% | +9.8% | -13.8% |
| ABOS | SELL | 2026-01-21 | 2026-01-23 | $1.87 | $17K | +1.7% | +7.1% | +11.0% |
| ABOS | SELL | 2026-01-08 | 2026-01-12 | $1.80 | $91K | +15.1% | +48.8% | +46.2% |
| ABOS | SELL · 10b5-1 | 2026-01-05 | 2026-01-07 | $1.98 | $53K | -4.6% | +23.1% | +34.4% |
| ABOS | SELL · 10b5-1 | 2025-01-21 | 2025-01-23 | $1.59 | $5K | -14.5% | -19.7% | -41.0% |
| ABOS | SELL · 10b5-1 | 2025-01-03 | 2025-01-07 | $1.84 | $20K | -9.9% | -18.8% | -42.0% |
| ABOS | SELL · 10b5-1 | 2024-01-19 | 2024-01-19 | $3.48 | $31K | -11.9% | -8.0% | -12.5% |
| XFOR | SELL · 10b5-1 | 2021-08-17 | 2021-08-19 | $5.10 | $42K | +14.0% | +13.8% | +6.7% |
| XFOR | SELL · 10b5-1 | 2021-06-24 | 2021-06-25 | $7.00 | $29K | -11.7% | -20.5% | -25.5% |
| XFOR | SELL · 10b5-1 | 2021-06-15 | 2021-06-17 | $7.84 | $33K | -19.0% | -29.3% | -40.1% |
| XFOR | SELL | 2020-09-09 | 2020-09-10 | $8.05 | $134K | -13.6% | -10.9% | -22.5% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.