Roderick de Greef is CFO at BIOLIFE SOLUTIONS INC (BLFS). They have made 64 open-market trades across 5 companies since 2006, most recently 2026-10-06.
CIK 0001241181
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.
1 open-market purchase totalling $30K since 2016, against 63 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| BLFS | 439,774 | $17.0M |
| TEUM | 451,949 | $123K |
| ELGX | 15,102 | $3K |
| CAMH | 657,873 | — |
| ETAK | 176,038 | — |
| Total | $17.1M |
Shares reported on the most recent Form 4, priced at the 2026-10-08 close. 2 holdings could not be priced and are excluded from the total.
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 |
|---|---|---|---|---|---|---|---|---|
| BLFS | SELL | 2025-11-11 | 2025-11-13 | $25.80 | $5.2M | +9.8% | +0.2% | -9.5% |
| BLFS | SELL · 10b5-1 | 2025-10-22 | 2025-10-24 | $27.30 | $2.1M | -4.5% | -8.8% | -10.0% |
| BLFS | SELL · 10b5-1 | 2024-10-31 | 2025-01-08 | $23.43 | $2.2M | +1.2% | -3.9% | -24.0% |
| BLFS | SELL · 10b5-1 | 2024-03-12 | 2024-03-12 | $16.60 | $241K | +12.0% | +2.9% | +29.5% |
| BLFS | SELL · 10b5-1 | 2024-01-19 | 2024-01-23 | $16.76 | $44K | +0.1% | -0.7% | -6.3% |
| BLFS | SELL | 2023-01-19 | 2023-01-24 | $23.19 | $176K | +6.5% | -6.9% | -20.9% |
| BLFS | SELL | 2022-11-28 | 2022-11-30 | $20.65 | $1.6M | -6.7% | -13.9% | +10.1% |
| BLFS | SELL | 2022-11-21 | 2022-11-23 | $21.66 | $303K | -11.5% | -17.6% | -1.2% |
| BLFS | SELL | 2022-11-16 | 2022-11-18 | $22.67 | $68K | +4.3% | -15.8% | +8.5% |
| BLFS | SELL | 2022-11-14 | 2022-11-15 | $23.86 | $477K | -14.4% | -22.1% | -5.2% |
| BLFS | SELL | 2022-10-07 | 2022-10-11 | $22.69 | $388K | -5.9% | +22.6% | +0.4% |
| BLFS | SELL | 2022-10-03 | 2022-10-04 | $21.95 | $27K | -16.9% | -0.5% | -27.7% |
| BLFS | SELL | 2022-07-12 | 2022-07-14 | $15.79 | $289K | +4.8% | +63.5% | +29.7% |
| BLFS | SELL | 2022-04-18 | 2022-04-19 | $17.59 | $652K | -24.5% | -27.9% | -3.7% |
| BLFS | SELL | 2022-04-07 | 2022-04-11 | $21.82 | $468K | -38.3% | -48.4% | -15.0% |
| BLFS | SELL | 2022-01-07 | 2022-01-11 | $30.75 | $396K | -9.0% | -8.9% | -38.0% |
| BLFS | SELL | 2021-12-29 | 2021-12-30 | $39.37 | $28K | -15.3% | -20.0% | -38.6% |
| BLFS | SELL | 2021-11-16 | 2021-11-18 | $51.07 | $1.1M | -27.9% | -29.4% | -50.7% |
| BLFS | SELL | 2021-10-25 | 2021-10-27 | $44.62 | $212K | +8.9% | -15.8% | -42.7% |
| BLFS | SELL | 2021-10-14 | 2021-10-18 | $39.97 | $49K | +19.7% | +22.0% | -30.7% |
| BLFS | SELL | 2021-09-28 | 2021-09-30 | $43.12 | $30K | -8.5% | +28.7% | -5.8% |
| BLFS | SELL | 2021-08-17 | 2021-08-19 | $44.80 | $2.5M | +27.0% | +2.7% | +12.5% |
| BLFS | SELL | 2021-06-29 | 2021-07-01 | $43.75 | $30K | -0.4% | +8.3% | -6.4% |
| BLFS | SELL | 2021-04-13 | 2021-04-15 | $34.59 | $930K | +2.8% | -8.4% | +34.0% |
| BLFS | SELL | 2021-04-01 | 2021-04-05 | $36.53 | $282K | -5.4% | -9.7% | +30.8% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.