RA CAPITAL MANAGEMENT, L.P.

Position in JATT — JATT II Acquisition Corp.

CIK 1346824 BOSTON, MA

Position in JATT

as of Jun 30, 2026 · filed Aug 14, 2026 Compact

Position Value

$5,680,000

New position

Shares Held

500,000

first reported quarter

Ownership

6.41%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

#1

of 25 holders

Holding Since

Jun 2026

1 quarter on record

Voting authority Sole 100% Shared 0% None 0%

Financial Services · as of Jun 30, 2026

RA CAPITAL MANAGEMENT, L.P. holds $22,790,000 across 3 Shell Companies names. JATT ranks #2 (24.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	HLXC	Helix Acquisition Corp. III	1,250,000	$13,300,000
2	JATT	JATT II Acquisition Corp. This page	500,000	$5,680,000
3	AMAN	Amanat Acquisition Corp.	375,000	$3,810,000

2 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$5,680,000	500,000	—	Shares	Sole	2026-08-14
2026-04-20	$5,125,000	500,000	—	Shares	Sole	2026-04-27
No filing history on record for this holder in this stock.