EcoR1 Capital, LLC

CIK

1587114

City

San Francisco

State / Country

CA

Stock

ETON — Eton Pharmaceuticals, Inc.

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 ETON

Compact Export CSV

Shares Held

Position Value (USD)

11 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$53,603,429	2,171,938	+7.0%	Shares	Sole	2026-05-15
2025-12-31	$34,336,499	2,030,544	0.0%	Shares	Sole	2026-02-17
2025-09-30	$44,123,721	2,030,544	0.0%	Shares	Sole	2025-11-14
2025-06-30	$28,935,252	2,030,544	+3920.9%	Shares	Sole	2025-08-14
2025-03-31	$655,490	50,500	-97.4%	Call	Sole	2025-05-15
2025-03-31	$25,171,958	1,939,288	-2.1%	Shares	Sole	2025-05-15
2024-12-31	$26,386,959	1,981,003	+8.3%	Shares	Sole	2025-02-14
2024-12-31	$24,370,311	1,829,603	+1108.5%	Shares	Sole	2025-02-14
2024-12-31	$2,016,648	151,400	-33.6%	Call	Sole	2025-02-14
2024-09-30	$1,368,000	228,000	-59.7%	Call	Sole	2024-11-14
2024-09-30	$3,396,450	566,075	—	Shares	Sole	2024-11-14
No 13F history on record for this holder in this stock.