Casdin Partners Master Fund, L.P.

Form 4 filings across 2 companies. Net figures count open-market buys and sales only. EDGAR profile ↗

Lifetime net: -$80.5M

Positions by company

Reported holding is the most recent post-transaction share count on a Table I row.

Every company this insider has reported trading in, with the value bought and sold at each and the date they last traded.
Ticker	Company	Bought	Sold	Net	Shares held	Last trade
BLFS	Biolife Solutions INC	$0	$96.8M	-$96.8M	4.8M	May 21
LAB	Standard Biotools INC.	$16.3M	$0	+$16.3M	72.1M	Dec 4, 2025

BLFS

Biolife Solutions INC

-$96.8M

Bought

Sold

$96.8M

Held

4.8M

LAB

Standard Biotools INC.

+$16.3M

Bought

$16.3M

Sold

Held

72.1M

Filing record

How quickly this filer reports. Section 16 allows two business days from the transaction.

1 of 18 filings we hold was filed after the two-business-day deadline. The furthest past the deadline was 1 business day late.

Form 4 filings made after the two-business-day deadline, with the transaction date, the filing date and the number of business days between them.
Traded	Filed	Company	Past deadline	Largest line	Source
Aug 15, 2025	Aug 20, 2025	BLFSBiolife Solutions INC	1day	$12.2M	Filing ↗

BLFS

Biolife Solutions INC

1day

Traded Aug 15, 2025 · filed Aug 20, 2025Filing ↗

Counted in business days from the transaction date, or the deemed execution date where the filing reports one, excluding weekends and federal holidays. How this is measured

Trade history

The 31 most recent Form 4 transactions.

Insider transactions, newest first: date, security, transaction type, size and a link to the filing each row came from.
Date	Ticker	Company	Type	Shares	Price	Value	Δ Own	Filing
May 21	BLFS	Biolife Solutions INC	SSELL	650,000	$23.70	$15.4M	-12.0%	Open the original filing on SEC.gov
May 20	BLFS	Biolife Solutions INC	SSELL	250,000	$23.70	$5.9M	-4.4%	Open the original filing on SEC.gov