Casdin Partners Master Fund, L.P. Insider Trading Activity
Casdin Partners Master Fund, L.P., an institutional filer, recorded 30 transactions over the last 12 months across 2 companies totaling $89.3M.
Activity concentrated in LAB with 24 filings. The largest single transaction was a sale of BLFS for $21.4M on Oct 15, 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% | -3.8% | 71% | 31 |
| 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 | ฮ OWNED | ROLE | FILING |
|---|---|---|---|---|---|---|---|---|
May 21, 2026 | BLFS | Sell | 650,000 | $23.70 | $15.4M | โ12.0% | 10%+ Owner | |
May 20, 2026 | BLFS | Sell | 250,000 | $23.70 | $5.9M | โ4.4% | 10%+ Owner | |
May 19, 2026 | BLFS | Sell | 300,000 | $22.65 | $6.8M | โ5.0% | 10%+ Owner | |
Dec 4, 2025 | LAB | Buy | 150,000 | $1.45 | $217K | +0.2% | Director | |
Dec 3, 2025 | LAB | Buy | 75,000 | $1.44 | $108K | +0.1% | Director | |
Dec 2, 2025 | LAB | Buy | 125,000 | $1.42 | $178K | +0.2% | Director | |
Nov 25, 2025 | LAB | Buy | 7,550,000 | $1.30 | $9.8M | +11.8% | Director | |
Nov 24, 2025 | LAB | Buy | 150,000 | $1.43 | $215K | +0.2% | Director | |
Nov 20, 2025 | LAB | Buy | 450,000 | $1.30 | $586K | +0.7% | Director | |
Nov 19, 2025 | LAB | Buy | 350,000 | $1.28 | $449K | +0.6% | Director | |
Nov 18, 2025 | LAB | Buy | 275,000 | $1.23 | $339K | +0.4% | Director | |
Nov 17, 2025 | LAB | Buy | 225,000 | $1.22 | $276K | +0.4% | Director | |
Nov 14, 2025 | LAB | Buy | 250,000 | $1.24 | $310K | +0.4% | Director | |
Nov 13, 2025 | LAB | Buy | 450,000 | $1.20 | $541K | +0.7% | Director | |
Nov 12, 2025 | LAB | Buy | 375,000 | $1.19 | $446K | +0.6% | Director | |
Nov 11, 2025 | LAB | Buy | 300,000 | $1.20 | $359K | +0.5% | Director | |
Nov 10, 2025 | LAB | Buy | 275,000 | $1.17 | $322K | +0.5% | Director | |
Nov 7, 2025 Filed 3d late | LAB | Buy | 225,000 | $1.12 | $253K | +0.4% | Director | |
Oct 15, 2025 | BLFS | Sell | 750,000 | $28.55 | $21.4M | โ11.2% | 10%+ Owner | |
Sep 9, 2025 | LAB | Buy | 100,000 | $1.29 | $129K | +0.2% | Director | |
Sep 4, 2025 | LAB | Buy | 250,000 | $1.28 | $319K | +0.4% | Director | |
Sep 3, 2025 | LAB | Buy | 250,000 | $1.27 | $316K | +0.4% | Director | |
Aug 26, 2025 | LAB | Buy | 125,000 | $1.26 | $158K | +0.2% | Director | |
Aug 25, 2025 | LAB | Buy | 200,000 | $1.24 | $248K | +0.3% | Director | |
Aug 22, 2025 | LAB | Buy | 200,000 | $1.26 | $253K | +0.3% | Director | |
Aug 15, 2025 Filed 4d late | BLFS | Sell | 500,000 | $24.40 | $12.2M | โ6.9% | 10%+ Owner | |
Aug 15, 2025 | LAB | Buy | 150,000 | $1.22 | $183K | +0.3% | Director | |
Aug 14, 2025 | LAB | Buy | 133,220 | $1.21 | $162K | +0.2% | Director | |
Aug 13, 2025 | LAB | Buy | 75,000 | $1.31 | $98K | +0.1% | Director | |
Aug 11, 2025 | BLFS | Sell | 500,000 | $22.60 | $11.3M | โ6.5% | 10%+ Owner | |
Jun 10, 2025 | BLFS | Sell | 1,000,000 | $23.80 | $23.8M | โ11.5% | 10%+ Owner |