Casdin Partners Master Fund, L.P.

CIK: 0001534265

Transaction Breakdown

Open Market Buys (P)25 (69.4%)

High conviction signal

Open Market Sales (S)7 (19.4%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)1 (2.8%)

Compensation grants

Other (G, F, J, C, D, …)3 (8.3%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (2)

BLFS

BIOLIFE SOLUTIONS INC

10% Owner

LAB

STANDARD BIOTOOLS INC.

Director10% Owner

Discretionary Trading P&L

Holdings

Transaction History (36 total)

BLFS
BIOLIFE SOLUTIONS INC
May 21, 2026
Sale(S)
Indirect
650K shares at avg. $23.70$15.4M
BLFS
BIOLIFE SOLUTIONS INC
May 20, 2026
Sale(S)
Indirect
250K shares at avg. $23.70$5.9M
BLFS
BIOLIFE SOLUTIONS INC
May 19, 2026
Sale(S)
Indirect
300K shares at avg. $22.65$6.8M
LAB
STANDARD BIOTOOLS INC.
Dec 4, 2025
Purchase(P)
Indirect
150K shares at avg. $1.45$217K
LAB
STANDARD BIOTOOLS INC.
Dec 3, 2025
Purchase(P)
Indirect
75K shares at avg. $1.44$108K
LAB
STANDARD BIOTOOLS INC.
Dec 2, 2025
Purchase(P)
Indirect
125K shares at avg. $1.42$178K
LAB
STANDARD BIOTOOLS INC.
Nov 25, 2025
Purchase(P)
Indirect
7.6M shares at avg. $1.30$9.8M
LAB
STANDARD BIOTOOLS INC.
Nov 24, 2025
Purchase(P)
Indirect
150K shares at avg. $1.43$215K
LAB
STANDARD BIOTOOLS INC.
Nov 20, 2025
Purchase(P)
Indirect
450K shares at avg. $1.30$586K
LAB
STANDARD BIOTOOLS INC.
Nov 19, 2025
Purchase(P)
Indirect
350K shares at avg. $1.28$449K
LAB
STANDARD BIOTOOLS INC.
Nov 18, 2025
Purchase(P)
Indirect
275K shares at avg. $1.23$339K
LAB
STANDARD BIOTOOLS INC.
Nov 17, 2025
Purchase(P)
Indirect
225K shares at avg. $1.22$276K
LAB
STANDARD BIOTOOLS INC.
Nov 14, 2025
Purchase(P)
Indirect
250K shares at avg. $1.24$310K
LAB
STANDARD BIOTOOLS INC.
Nov 13, 2025
Purchase(P)
Indirect
450K shares at avg. $1.20$541K
LAB
STANDARD BIOTOOLS INC.
Nov 12, 2025
Purchase(P)
Indirect
375K shares at avg. $1.19$446K
LAB
STANDARD BIOTOOLS INC.
Nov 11, 2025
Purchase(P)
Indirect
300K shares at avg. $1.20$359K
LAB
STANDARD BIOTOOLS INC.
Nov 10, 2025
Purchase(P)
Indirect
275K shares at avg. $1.17$322K
LAB
STANDARD BIOTOOLS INC.
Nov 7, 2025
Purchase(P)
Indirect
225K shares at avg. $1.12$253K
BLFS
BIOLIFE SOLUTIONS INC
Oct 15, 2025
Sale(S)
Indirect
750K shares at avg. $28.55$21.4M
LAB
STANDARD BIOTOOLS INC.
Sep 9, 2025
Purchase(P)
Indirect
100K shares at avg. $1.29$129K
LAB
STANDARD BIOTOOLS INC.
Sep 4, 2025
Purchase(P)
Indirect
250K shares at avg. $1.28$319K
LAB
STANDARD BIOTOOLS INC.
Sep 3, 2025
Purchase(P)
Indirect
250K shares at avg. $1.27$316K
LAB
STANDARD BIOTOOLS INC.
Aug 26, 2025
Purchase(P)
Indirect
125K shares at avg. $1.26$158K
LAB
STANDARD BIOTOOLS INC.
Aug 25, 2025
Purchase(P)
Indirect
200K shares at avg. $1.24$248K
LAB
STANDARD BIOTOOLS INC.
Aug 22, 2025
Purchase(P)
Indirect
200K shares at avg. $1.26$253K

		Type	Shares	Price		Ownership
May 21, 2026	BLFS BIOLIFE SOLUTIONS INC	Sale(S)	650,000	$23.70	$15,405,000	Indirect
May 20, 2026	BLFS BIOLIFE SOLUTIONS INC	Sale(S)	250,000	$23.70	$5,925,000	Indirect
May 19, 2026	BLFS BIOLIFE SOLUTIONS INC	Sale(S)	300,000	$22.65	$6,795,000	Indirect
Dec 4, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	150,000	$1.45	$217,020	Indirect
Dec 3, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	75,000	$1.44	$108,037	Indirect
Dec 2, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	125,000	$1.42	$177,513	Indirect
Nov 25, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	7,550,000	$1.30	$9,838,405	Indirect
Nov 24, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	150,000	$1.43	$214,875	Indirect
Nov 20, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	450,000	$1.30	$586,260	Indirect
Nov 19, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	350,000	$1.28	$448,910	Indirect
Nov 18, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	275,000	$1.23	$339,405	Indirect
Nov 17, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	225,000	$1.22	$275,580	Indirect
Nov 14, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	250,000	$1.24	$309,800	Indirect
Nov 13, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	450,000	$1.20	$541,395	Indirect
Nov 12, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	375,000	$1.19	$445,838	Indirect
Nov 11, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	300,000	$1.20	$358,800	Indirect
Nov 10, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	275,000	$1.17	$321,915	Indirect
Nov 7, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	225,000	$1.12	$252,765	Indirect
Oct 15, 2025	BLFS BIOLIFE SOLUTIONS INC	Sale(S)	750,000	$28.55	$21,410,325	Indirect
Sep 9, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	100,000	$1.29	$128,920	Indirect
Sep 4, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	250,000	$1.28	$319,350	Indirect
Sep 3, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	250,000	$1.27	$316,400	Indirect
Aug 26, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	125,000	$1.26	$157,938	Indirect
Aug 25, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	200,000	$1.24	$248,180	Indirect
Aug 22, 2025	LAB STANDARD BIOTOOLS INC.	Purchase(P)	200,000	$1.26	$252,680	Indirect

1-25 of 36 transactions

About Casdin Partners Master Fund, L.P.

Casdin Partners Master Fund, L.P. (SEC CIK 0001534265) files insider reports with the SEC as 10% Owner of BIOLIFE SOLUTIONS INC (BLFS) and Director of STANDARD BIOTOOLS INC. (LAB).

Signal8 holds 18 ownership filings by Casdin Partners Master Fund, L.P., all Form 4s, filed between Mar 4, 2025 and May 21, 2026. Those filings report 36 transactions, from Feb 28, 2025 to May 21, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Casdin Partners Master Fund, L.P.'s filings is in NEW YORK, NY.

Recent filings by Casdin Partners Master Fund, L.P.

May 21, 2026: Open-market sale of BLFS shares (Form 4, code S).
May 20, 2026: Open-market sale of BLFS shares (Form 4, code S).
May 19, 2026: Open-market sale of BLFS shares (Form 4, code S).
Dec 4, 2025: Open-market purchase of LAB shares (Form 4, code P).
Dec 3, 2025: Open-market purchase of LAB shares (Form 4, code P).