WaveMan · Form 4
Casdin Partners Master Fund, L.P. insider trades
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Casdin Partners Master Fund, L.P. insider trades

Casdin Partners Master Fund, L.P. has filed 11 Form 4s with the SEC that we hold, for Biolife Solutions INC (BLFS) (10% owner), Standard Biotools INC. (LAB) (Director, 10% owner) and GeneDx Holdings Corp. (WGS) (Director, 10% owner). Across all of them we count 15 purchases worth $25.3M and 3 sales worth $28.1M reported on Form 4. In the last 12 months: 6 purchases ($22.6M) and 3 sales ($28.1M). The largest single trade was a sale of 650,000 shares of Biolife Solutions INC worth $15.4M, dated 2026-05-21. The first filing on our record is dated 2022-04-06 and the latest 2026-05-21.

Biolife Solutions INC (BLFS)

10% owner · 4 filings · 6 purchases and sales
Trade dateCodeSharesValue as filedFiled
2023-05-16P, purchase reported on Form 415,000$302.9K2023-05-18
2023-05-17P, purchase reported on Form 430,027$639.6K2023-05-18
2023-05-18P, purchase reported on Form 430,000$652.8K2023-05-18
2026-05-19S, sale reported on Form 4300,000$6.8M2026-05-21
2026-05-20S, sale reported on Form 4250,000$5.9M2026-05-21
2026-05-21S, sale reported on Form 4650,000$15.4M2026-05-21

Standard Biotools INC. (LAB)

Director, 10% owner · 4 filings · 7 purchases and sales
Trade dateCodeSharesValue as filedFiled
2025-08-22P, purchase reported on Form 4200,000$252.0K2025-08-26
2025-08-25P, purchase reported on Form 4200,000$248.0K2025-08-26
2025-08-26P, purchase reported on Form 4125,000$157.5K2025-08-26
2025-09-09P, purchase reported on Form 4100,000$129.0K2025-09-11
2025-11-13P, purchase reported on Form 4450,000$540.0K2025-11-17
2025-11-14P, purchase reported on Form 4250,000$310.0K2025-11-17
2025-11-17P, purchase reported on Form 4225,000$274.5K2025-11-17

GeneDx Holdings Corp. (WGS)

Director, 10% owner · 3 filings · 5 purchases and sales
Trade dateCodeSharesValue as filedFiled
2024-03-04P, purchase reported on Form 440,000$349.6K2024-03-06
2024-03-05P, purchase reported on Form 4900$7.9K2024-03-06
2026-05-18P, purchase reported on Form 4175,000$7.4M2026-05-20
2026-05-19P, purchase reported on Form 4185,000$7.9M2026-05-20
2026-05-20P, purchase reported on Form 4140,000$6.1M2026-05-20
Source

Counted from the Form 4 filings this reporting owner (SEC CIK 1534265) filed on EDGAR. Values are the transaction values as filed. See every filing on EDGAR, or browse insider buying and today's insider purchases.

Source: U.S. Securities and Exchange Commission (EDGAR) and other official government data · Updated 2026-10-12 · For informational purposes only, not investment advice.
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