Twin Securities, Inc.

Broker-Dealer

Position in DAWN — Day One Biopharmaceuticals, Inc.

CIK 1351351 New York, NY

Position in DAWN

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$678,061

New position

Shares Held

31,626

first reported quarter

Ownership

0.031%

of shares outstanding

% of Portfolio

0.34%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2026

1 quarter on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Mar 31, 2026

Twin Securities, Inc. holds $22,536,995 across 6 Biotechnology names. DAWN ranks #5 (3.0% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ACLX	Arcellx, Inc.	53,982	$6,198,213
2	TERN	Terns Pharmaceuticals, Inc.	115,958	$6,113,305
3	APLS	Apellis Pharmaceuticals, Inc.	127,440	$5,126,911
4	RVMD	Revolution Medicines, Inc.	38,593	$3,753,169
5	DAWN	Day One Biopharmaceuticals, Inc. This page	31,626	$678,061
6	RNA	Atrium Therapeutics, Inc.	49,913	$667,336

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$678,061	31,626	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.