Casdin Partners Master Fund, L.P. Insider Trading Activity
Casdin Partners Master Fund, L.P., an institutional filer, recorded 31 transactions over the last 12 months across 2 companies totaling $113.1M.
Activity concentrated in LAB with 24 filings. The largest single transaction was a sale of BLFS for $23.8M on Jun 10, 2025.
Performance Scorecard
Forward stock performance after each transaction by Casdin Partners Master Fund, L.P.. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.
| PERIOD | AVG BUY RETURN | AVG SELL AVOIDED | SUCCESS RATE | TRADES |
|---|---|---|---|---|
| 30 days | +12.5% | -0.7% | 79% | 28 |
| 90 days | -3.7% | -3.3% | 39% | 28 |
| 120 days | -10.4% | -0.3% | 29% | 28 |
Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.
Price & Trades
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| DATE | TICKER | TYPE | SHARES | PRICE | VALUE | ROLE |
|---|---|---|---|---|---|---|
| May 21, 2026 | BLFS | Sell | 650,000 | $23.70 | $15.4M | 10%+ Owner |
| May 20, 2026 | BLFS | Sell | 250,000 | $23.70 | $5.9M | 10%+ Owner |
| May 19, 2026 | BLFS | Sell | 300,000 | $22.65 | $6.8M | 10%+ Owner |
| Dec 4, 2025 | LAB | Buy | 150,000 | $1.45 | $217K | Director |
| Dec 3, 2025 | LAB | Buy | 75,000 | $1.44 | $108K | Director |
| Dec 2, 2025 | LAB | Buy | 125,000 | $1.42 | $178K | Director |
| Nov 25, 2025 | LAB | Buy | 7,550,000 | $1.30 | $9.8M | Director |
| Nov 24, 2025 | LAB | Buy | 150,000 | $1.43 | $215K | Director |
| Nov 20, 2025 | LAB | Buy | 450,000 | $1.30 | $586K | Director |
| Nov 19, 2025 | LAB | Buy | 350,000 | $1.28 | $449K | Director |
| Nov 18, 2025 | LAB | Buy | 275,000 | $1.23 | $339K | Director |
| Nov 17, 2025 | LAB | Buy | 225,000 | $1.22 | $276K | Director |
| Nov 14, 2025 | LAB | Buy | 250,000 | $1.24 | $310K | Director |
| Nov 13, 2025 | LAB | Buy | 450,000 | $1.20 | $541K | Director |
| Nov 12, 2025 | LAB | Buy | 375,000 | $1.19 | $446K | Director |
| Nov 11, 2025 | LAB | Buy | 300,000 | $1.20 | $359K | Director |
| Nov 10, 2025 | LAB | Buy | 275,000 | $1.17 | $322K | Director |
| Nov 7, 2025 | LAB | Buy | 225,000 | $1.12 | $253K | Director |
| Oct 15, 2025 | BLFS | Sell | 750,000 | $28.55 | $21.4M | 10%+ Owner |
| Sep 9, 2025 | LAB | Buy | 100,000 | $1.29 | $129K | Director |
| Sep 4, 2025 | LAB | Buy | 250,000 | $1.28 | $319K | Director |
| Sep 3, 2025 | LAB | Buy | 250,000 | $1.27 | $316K | Director |
| Aug 26, 2025 | LAB | Buy | 125,000 | $1.26 | $158K | Director |
| Aug 25, 2025 | LAB | Buy | 200,000 | $1.24 | $248K | Director |
| Aug 22, 2025 | LAB | Buy | 200,000 | $1.26 | $253K | Director |
| Aug 15, 2025 | BLFS | Sell | 500,000 | $24.40 | $12.2M | 10%+ Owner |
| Aug 15, 2025 | LAB | Buy | 150,000 | $1.22 | $183K | Director |
| Aug 14, 2025 | LAB | Buy | 133,220 | $1.21 | $162K | Director |
| Aug 13, 2025 | LAB | Buy | 75,000 | $1.31 | $98K | Director |
| Aug 11, 2025 | BLFS | Sell | 500,000 | $22.60 | $11.3M | 10%+ Owner |
| Jun 10, 2025 | BLFS | Sell | 1,000,000 | $23.80 | $23.8M | 10%+ Owner |