Jennifer Michaelson is CSO at Cullinan Therapeutics, Inc. (CGEM). They have made 22 open-market trades across 1 company since 2021, most recently 2026-09-08.
CIK 0001838061
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 22 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| CGEM | 158,844 | $2.0M |
Shares reported on the most recent Form 4, priced at the 2026-09-10 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 |
|---|---|---|---|---|---|---|---|---|
| CGEM | SELL · 10b5-1 | 2026-09-08 | 2026-09-10 | $21.57 | $173K | +2.1% | -29.6% | — |
| CGEM | SELL · 10b5-1 | 2026-08-13 | 2026-08-14 | $20.26 | $608K | +13.2% | +1.0% | — |
| CGEM | SELL · 10b5-1 | 2026-07-06 | 2026-07-07 | $17.82 | $143K | -0.9% | +0.8% | -9.9% |
| CGEM | SELL · 10b5-1 | 2026-05-05 | 2026-05-06 | $14.62 | $117K | -1.1% | -10.5% | +16.6% |
| CGEM | SELL | 2026-03-05 | 2026-03-09 | $15.68 | $125K | -16.8% | -4.8% | -15.6% |
| CGEM | SELL · 10b5-1 | 2026-02-25 | 2026-02-26 | $14.14 | $25K | -1.7% | -11.5% | +2.1% |
| CGEM | SELL · 10b5-1 | 2026-02-23 | 2026-02-25 | $14.31 | $77K | +6.8% | -10.4% | +7.9% |
| CGEM | SELL | 2026-02-20 | 2026-02-23 | $14.08 | $165K | +11.1% | +0.0% | +10.1% |
| CGEM | SELL | 2026-02-12 | 2026-02-13 | $12.03 | $5K | +28.5% | +18.3% | +36.4% |
| CGEM | SELL · 10b5-1 | 2026-01-22 | 2026-01-23 | $12.30 | $49K | +0.3% | +13.8% | +5.2% |
| CGEM | SELL · 10b5-1 | 2025-12-19 | 2025-12-22 | $10.01 | $13K | -0.2% | +15.9% | +28.1% |
| CGEM | SELL | 2025-12-18 | 2025-12-19 | $9.67 | $28K | +2.4% | +10.0% | +32.5% |
| CGEM | SELL · 10b5-1 | 2025-12-12 | 2025-12-16 | $12.23 | $38K | -0.6% | +4.5% | +37.4% |
| CGEM | SELL · 10b5-1 | 2025-11-24 | 2025-11-25 | $12.30 | $49K | +3.6% | -13.7% | +16.5% |
| CGEM | SELL | 2025-02-25 | 2025-02-27 | $8.53 | $32K | +0.2% | -12.5% | -9.4% |
| CGEM | SELL · 10b5-1 | 2025-01-06 | 2025-01-07 | $12.51 | $50K | -10.0% | -10.6% | -37.4% |
| CGEM | SELL | 2024-12-18 | 2024-12-20 | $11.41 | $107K | +9.2% | -10.2% | -24.9% |
| CGEM | SELL | 2024-12-12 | 2024-12-16 | $12.52 | $44K | +0.3% | -15.0% | -24.6% |
| CGEM | SELL · 10b5-1 | 2024-11-05 | 2024-11-07 | $15.64 | $125K | -17.3% | -19.8% | -35.0% |
| CGEM | SELL · 10b5-1 | 2024-09-05 | 2024-09-09 | $18.09 | $145K | -1.3% | -15.0% | -30.1% |
| CGEM | SELL · 10b5-1 | 2024-07-05 | 2024-07-09 | $16.33 | $261K | +13.0% | +1.2% | -0.9% |
| CGEM | SELL · 10b5-1 | 2024-05-06 | 2024-05-08 | $28.25 | $3.6M | -12.3% | -18.0% | -37.0% |
| CGEM | SELL | 2023-12-21 | 2023-12-22 | $8.50 | $10K | +10.1% | +34.3% | +76.8% |
| CGEM | SELL | 2023-12-18 | 2023-12-20 | $8.22 | $2K | +22.6% | +35.6% | +82.6% |
| CGEM | SELL | 2023-12-12 | 2023-12-13 | $7.81 | $8K | +11.0% | +22.3% | +95.6% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.