Casdin Partners Master Fund, L.P.
SEC Form 4 insider trading activity
Casdin Partners Master Fund, L.P. has filed 9 SEC Form 4 filings (22 transaction rows) across 2 companies, including BLFS, LAB, with disclosures dating back to 2025. 7 of those filings fall inside the rolling window. Most recent filing: May 21, 2026.
On the most recent filing, Casdin Partners Master Fund, L.P. is listed as 10% Owner at BIOLIFE SOLUTIONS INC. Inside the rolling window, Casdin Partners Master Fund, L.P. reported 15 open-market purchases totaling $14.4M in LAB and 4 open-market sales totaling $49.5M in BLFS. The largest disclosed transaction in the window is a sale of 750,000 BLFS shares on Oct 15, 2025, worth $21.4M.
Companies traded
Other insiders at BLFS
Insider Buying
$14.4M
reported purchases (SEC code P)
Insider Selling
$49.5M
reported sales (SEC code S)
Companies
2
in the rolling window
| Source | |||||||
|---|---|---|---|---|---|---|---|
| BLFS | 10% Owner | Sale | 300,000 | $6.8M | May 21 | SEC ↗ | |
| BLFS | 10% Owner | Sale | 250,000 | $5.9M | May 21 | SEC ↗ | |
| BLFS | 10% Owner | Sale | 650,000 | $15.4M | May 21 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 125,000 | $178K | Dec 4 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 75,000 | $108K | Dec 4 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 150,000 | $217K | Dec 4 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 150,000 | $215K | Nov 26 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 7,550,000 | $9.8M | Nov 26 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 275,000 | $339K | Nov 20 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 350,000 | $449K | Nov 20 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 450,000 | $586K | Nov 20 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 450,000 | $541K | Nov 17 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 250,000 | $310K | Nov 17 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 225,000 | $276K | Nov 17 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 225,000 | $253K | Nov 12 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 275,000 | $322K | Nov 12 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 300,000 | $359K | Nov 12 | SEC ↗ | |
| LAB | Director, 10% Owner | Purchase | 375,000 | $446K | Nov 12 | SEC ↗ | |
| BLFS | 10% Owner | Sale | 750,000 | $21.4M | Oct 17 | SEC ↗ |
Earlier trades
Open-market purchases and sales filed before the rolling 365-day window, kept from the original Form 4 filings.
| Date | Ticker | Type | Value |
|---|---|---|---|
| Sep 9, 2025 | LAB | Purchase | $129K |
| Sep 4, 2025 | LAB | Purchase | $319K |
| Sep 3, 2025 | LAB | Purchase | $316K |
Frequently asked questions
How many SEC Form 4 filings has Casdin Partners Master Fund, L.P. made?
Casdin Partners Master Fund, L.P. has filed 9 SEC Form 4 filings (22 transaction rows) across 2 companies, including BLFS, LAB since 2025.
Which companies does Casdin Partners Master Fund, L.P. trade?
Casdin Partners Master Fund, L.P. has filed SEC Form 4 disclosures for 2 companies, including BLFS, LAB.
When was Casdin Partners Master Fund, L.P.'s most recent SEC Form 4 filing?
Casdin Partners Master Fund, L.P.'s most recent SEC Form 4 filing on Tracefour is dated May 21, 2026.
What is Casdin Partners Master Fund, L.P.'s total buy and sell value in the current window?
Inside the rolling retention window, Casdin Partners Master Fund, L.P. bought $14.4M and sold $49.5M based on SEC Form 4 filings.
What was Casdin Partners Master Fund, L.P.'s largest disclosed transaction?
The largest disclosed transaction in the current window is a sale of 750,000 BLFS shares on 2025-10-15, worth $21.4M, per SEC Form 4 filings.