Rock Springs Capital Management LP

Position in ALT — Altimmune, Inc.

CIK 1595725 Baltimore, MD

Back to ALT Full portfolio

Position in ALT

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

Position Value

$1,433,253

+$645,163 QoQ

Shares Held

471,465

+111.2% QoQ

Ownership

0.242%

of shares outstanding

% of Portfolio

0.07%

of 13F equity value

Holder Rank

#37

of 210 holders

Holding Since

Sep 2022

5 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in ALT Over Time

Shares Held

Position Value (USD)

Derivatives in ALT

reported options exposure · as of Sep 30, 2022

CallValue

$427,795

CallShares

33,500

PutValue

PutShares

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. ALT ranks #63 (0.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	RVMD	Revolution Medicines, Inc.	1,105,210	$206,983,728
2	TVTX	Travere Therapeutics, Inc.	2,179,069	$123,792,909
3	MDGL	Madrigal Pharmaceuticals, Inc.	174,999	$93,965,713
4	MIRM	Mirum Pharmaceuticals, Inc.	798,145	$93,438,835
5	RYTM	Rhythm Pharmaceuticals, Inc.	692,598	$76,899,155
6	KYMR	Kymera Therapeutics, Inc.	453,156	$51,963,398
7	ARGX	Argenx SE	52,750	$48,939,867
8	ASND	Ascendis Pharma A/S	168,750	$45,009,000

All Filings in ALT

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6 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$1,433,253	471,465	+111.2%	Shares	Sole	2026-08-14
2023-06-30	$788,090	223,255	0.0%	Shares	Sole	2023-08-14
2023-03-31	$942,136	223,255	0.0%	Shares	Sole	2023-05-15
2022-12-31	$3,672,544	223,255	0.0%	Shares	Sole	2023-02-14
2022-09-30	$2,850,966	223,255	—	Shares	Sole	2022-11-14
2022-09-30	$427,795	33,500	—	Call	Sole	2022-11-14
No filing history on record for this holder in this stock.