Summary
Updated Aug 31, 2026
Casdin Partners Master Fund, L.P. is 10% Owner of BIOLIFE SOLUTIONS INC (BLFS). 13 SEC Form 4 filings on record going back to 2025, most recently on 21 May 2026. Most recent open-market trade: sold $15.40M of BLFS on 21 May 2026. Lifetime open-market purchases: $16.30M. Lifetime open-market sales: $73.04M. Historical track record: 5/5 stars across 24 tracked purchases.
Recent Transactions
20Every recent SEC Form 4 transaction Casdin Partners Master Fund, L.P. has reported, most recent first.
Track Record
InsiderAlpha computes a forward-return-based score for every insider with enough Form 4 purchase history. The metrics below reflect realized performance after each tracked open-market purchase.
| Metric | Value |
|---|---|
| InsiderAlpha rating | ★★★★★ (5/5) |
| Total purchases tracked | 24 |
| Purchases with forward-return data | 24 |
| 30-day win rate | 75% |
| 90-day win rate | 42% |
| Avg 5-day return | +3.59% |
| Avg 30-day return | +12.11% |
| Avg 90-day return | -4.07% |
| Best 30-day return | +33.87% |
Trading Pattern
InsiderAlpha's records for Casdin Partners Master Fund, L.P. go back to 2025: 13 primary Form 4 filings, an average of 6.5 per year. The typical open-market purchase is $679K (24 buys totaling $16.30M). The largest single buy on record is $9.84M of LAB in 2025. Sales side: 6 recorded sales totaling $73.04M, so the filing history runs sell-heavy by dollar value. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Casdin Partners Master Fund, L.P. files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- Greef Roderick de - $3.61M of BLFS open-market activity in the last 12 months
- Karen A. Foster - $2.06M of BLFS open-market activity in the last 12 months
- Troy Wichterman - $850K of BLFS open-market activity in the last 12 months
- Amy Duross - $257K of BLFS open-market activity in the last 12 months
- Aby J. Mathew - $56K of BLFS open-market activity in the last 12 months
- Joydeep Goswami - $48K of BLFS open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
What is Casdin Partners Master Fund, L.P.?
Casdin Partners Master Fund, L.P. is an investment firm, tracked as 10% Owner of BIOLIFE SOLUTIONS INC (BLFS). InsiderAlpha holds 13 primary Form 4 filings for it, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did Casdin Partners Master Fund, L.P. last file a Form 4?
The most recent primary Form 4 on record is dated 21 May 2026, one of 13 filings going back to 2025.
Has Casdin Partners Master Fund, L.P. been buying or selling stock?
Recorded transactions: 24 open-market purchases ($16.30M) and 6 open-market sales ($73.04M) across all tracked filings.
How accurate is Casdin Partners Master Fund, L.P.'s historical track record?
Across 24 tracked purchases, Casdin Partners Master Fund, L.P. averaged +12.1% avg 30-day return with a 75% 30-day win rate. InsiderAlpha rates the track record at 5/5 stars.
Where can I see all of Casdin Partners Master Fund, L.P.'s SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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