Disclosed positions

Estimated from their latest filings — positions may have changed since

$13.00M

combined est. value

Stock	Shares	Price	Value	Weight	As of
RGENREPLIGEN CORP	89,062	$137.41	$12.24M	94%	2026-03-02
BLFSBIOLIFE SOLUTIONS INC	15,046	$27.19	$409.1K	3%	2026-02-24
MASS908 Devices Inc.	44,168	$7.88	$348.0K	3%	2026-06-10

RGEN

REPLIGEN CORP

$12.24M

89,062 sh

BLFS

BIOLIFE SOLUTIONS INC

$409.1K

15,046 sh

MASS

908 Devices Inc.

$348.0K

44,168 sh

All filings on record

Every Form 4 transaction we track for this filer

all 26buys 0sells 18

Stock	Transaction	Date	~6mo later
MASS908 Devices Inc.	Exercise — · 14,083 sh	2026-06-10	—
RGENREPLIGEN CORP	Tax $1.24M · 9,897 sh	2026-03-02	—
BLFSBIOLIFE SOLUTIONS INC	Grant — · 8,170 sh	2026-02-24	—
RGENREPLIGEN CORP	Other — · 2,000 sh	2025-12-04	—
RGENREPLIGEN CORP	Exercise $100.0K · 2,952 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $307.3K · 1,956 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $896.2K · 5,737 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $466.3K · 3,000 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $385.8K · 2,500 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $447.6K · 2,923 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $319.6K · 2,100 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $269.4K · 1,784 sh	2025-11-13	—
RGENREPLIGEN CORP	Sell $73.5K · 464 sh	2025-11-12	—
RGENREPLIGEN CORP	Sell $1.75M · 11,096 sh	2025-11-12	—
RGENREPLIGEN CORP	Sell $776.8K · 4,959 sh	2025-11-12	—
RGENREPLIGEN CORP	Sell $738.7K · 4,740 sh	2025-11-12	—
RGENREPLIGEN CORP	Sell $579.6K · 3,741 sh	2025-11-12	—
RGENREPLIGEN CORP	Exercise $846.7K · 25,000 sh	2025-11-12	—
RGENREPLIGEN CORP	Sell $266.3K · 2,179 sh	2025-09-10	—
RGENREPLIGEN CORP	Sell $920.8K · 7,584 sh	2025-09-10	—
RGENREPLIGEN CORP	Sell $1.79M · 14,882 sh	2025-09-10	—
RGENREPLIGEN CORP	Sell $390.3K · 3,262 sh	2025-09-10	—
RGENREPLIGEN CORP	Sell $131.1K · 1,108 sh	2025-09-10	—
RGENREPLIGEN CORP	Sell $11.2K · 96 sh	2025-09-10	—
RGENREPLIGEN CORP	Exercise $677.4K · 20,000 sh	2025-09-10	—

MASSExercise

2026-06-10 · 908 Devices Inc.

14,083

—

RGENTax

2026-03-02 · REPLIGEN CORP

$1.24M

—

BLFSGrant

2026-02-24 · BIOLIFE SOLUTIONS INC

8,170

—

RGENOther

2025-12-04 · REPLIGEN CORP

2,000

—

RGENExercise

2025-11-13 · REPLIGEN CORP

$100.0K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$307.3K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$896.2K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$466.3K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$385.8K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$447.6K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$319.6K

—

RGENSell

2025-11-13 · REPLIGEN CORP

$269.4K

—

RGENSell

2025-11-12 · REPLIGEN CORP

$73.5K

—

RGENSell

2025-11-12 · REPLIGEN CORP

$1.75M

—

RGENSell

2025-11-12 · REPLIGEN CORP

$776.8K

—

RGENSell

2025-11-12 · REPLIGEN CORP

$738.7K

—

RGENSell

2025-11-12 · REPLIGEN CORP

$579.6K

—

RGENExercise

2025-11-12 · REPLIGEN CORP

$846.7K

—

RGENSell

2025-09-10 · REPLIGEN CORP

$266.3K

—

RGENSell

2025-09-10 · REPLIGEN CORP

$920.8K

—

RGENSell

2025-09-10 · REPLIGEN CORP

$1.79M

—

RGENSell

2025-09-10 · REPLIGEN CORP

$390.3K

—

RGENSell

2025-09-10 · REPLIGEN CORP

$131.1K

—

RGENSell

2025-09-10 · REPLIGEN CORP

$11.2K

—

RGENExercise

2025-09-10 · REPLIGEN CORP

$677.4K

—

Show all 26 filings

Outcomes measure each disclosed buy against the closing price ~6 months (120 trading days) later, with the S&P 500 over the same span for context. Pre-scheduled 10b5-1 plan trades are excluded from the record. Positions are estimated from the latest reported post-transaction holdings, split-adjusted, at the latest close. Built from SEC Form 4 filings and market prices — past outcomes, not predictions or advice.