CP
Insider
Casdin Partners Master Fund, L.P.
DirectorCasdin Partners Master Fund, L.P. (Director) filed 6 Form 4 reports as a reporting entity in the trailing twelve months (5 purchases, 1 sale), most often in LAB. Across 5 priced purchase filings, the average 21-session return was +14.0% from execution and +12.5% from disclosure (delay-adjusted; derived). The largest single filing was $28.1M of BLFS (1,200,000 sh across 3 lots, as filed), executed May 19. Data as of Nov 8 2026.
Add to watchlistReturn, ttmiAverage return per filing, trailing twelve months
+14.0%
avg across 5 priced filings
Delay-adjustediThe same average, entered at disclosure dates
+12.5%
same 5 filings, from disclosure
Filings, ttm
6
5 buys · 1 sells
Median delay
2d
execution → disclosure
Volume, ttmiDollar value disclosed in the trailing twelve months
$28.6M
shares × price, as filed
Last traded
May 21
Filed May 21
Impact on $10,000 · 12M
$11,104 (+11.0%)
S&P 500 $10,907 (+9.1%) · 2.0 pts ahead
Casdin Partners Master Fund, L.P.
S&P 500
Derived: compounded across filings from disclosure dates · past 12 months
Open performance→Volume by month
Buys $16.2M
Sells $28.1M
Shares × price, as filed · by filing month · past 24 months
Most traded names
LAB
LAB
9 buys · 0 sells
9 filings
BLFS
BLFS
0 buys · 1 sell
1 filing
Recent filings
LABPURCHASE
STANDARD BIOTOOLS INC.
View filing →
$659K525,000 sh across 3 lots
Exec Aug 22 2025
Filed Aug 26 2025 · 8:46 PM ET LABPURCHASE STANDARD BIOTOOLS INC. View filing → $345K
283,220 sh across 2 lots
Exec Aug 14 2025
Filed Aug 15 2025 · 9:18 PM ET