EcoR1 Capital, LLC

CIK

1587114

City

San Francisco

State / Country

CA

Stock

JAZZ — Jazz Pharmaceuticals plc

Top Portfolio Positions

28 positions · $2,359,197,078 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio	Open
ZYME	Zymeworks Inc. Healthcare	22,970,388	$575,178,515	24.38%
ANAB	Anaptysbio, Inc Healthcare	7,880,094	$437,030,013	18.52%
JAZZ	Jazz Pharmaceuticals plc Healthcare	1,706,469	$322,607,964	13.67%
CNTA	Centessa Pharmaceuticals plc Healthcare	6,410,800	$254,636,976	10.79%
CRNX	Crinetics Pharmaceuticals, Inc. Healthcare	4,288,120	$155,744,518	6.60%
AKTS	Aktis Oncology, Inc. Healthcare	4,824,469	$86,309,750	3.66%
ORIC	Oric Pharmaceuticals, Inc. Healthcare	6,728,116	$85,245,229	3.61%
CGON	CG Oncology, Inc. Healthcare	1,102,000	$74,583,360	3.16%
CRSP	CRISPR Therapeutics AG Healthcare	1,389,276	$66,087,859	2.80%
ETON	Eton Pharmaceuticals, Inc. Healthcare	2,171,938	$53,603,429	2.27%

Portfolio Trend

25 quarters · across all stocks

Holdings in JAZZ

Compact Export CSV

Shares Held

Position Value (USD)

12 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$322,607,964	1,706,469	0.0%	Shares	Sole	2026-05-15
2025-12-31	$290,099,730	1,706,469	0.0%	Shares	Sole	2026-02-17
2025-09-30	$224,912,614	1,706,469	0.0%	Shares	Sole	2025-11-14
2025-06-30	$181,090,490	1,706,469	0.0%	Shares	Sole	2025-08-14
2025-03-31	$211,858,126	1,706,469	0.0%	Shares	Sole	2025-05-15
2024-12-31	$210,151,657	1,706,469	0.0%	Shares	Sole	2025-02-14
2024-09-30	$190,117,711	1,706,469	+68.3%	Shares	Sole	2024-11-14
2024-06-30	$108,219,096	1,013,952	0.0%	Shares	Sole	2024-08-14
2024-03-31	$122,100,099	1,013,952	0.0%	Shares	Sole	2024-05-15
2023-12-31	$124,716,096	1,013,952	+175.2%	Shares	Sole	2024-02-14
2023-09-30	$47,687,119	368,411	0.0%	Shares	Sole	2023-11-14
2023-06-30	$45,671,911	368,411	—	Shares	Sole	2023-08-14
No 13F history on record for this holder in this stock.