Rock Springs Capital Management LP

Position in ACRS — Aclaris Therapeutics, Inc.

CIK 1595725 Baltimore, MD

Back to ACRS Full portfolio

Position in ACRS

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

Position Value

$22,908,514

+$6,136,077 QoQ

Shares Held

4,330,532

-3.2% QoQ

Ownership

2.94%

of shares outstanding

% of Portfolio

1.12%

of 13F equity value

Holder Rank

of 149 holders

Holding Since

Mar 2020

26 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in ACRS Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. ACRS ranks #17 (1.5% 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 ACRS

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26 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$22,908,514	4,330,532	-3.2%	Shares	Sole	2026-08-14
2026-03-31	$16,772,437	4,472,650	+0.4%	Shares	Sole	2026-05-15
2025-12-31	$13,405,760	4,453,741	-3.4%	Shares	Sole	2026-02-17
2025-09-30	$8,757,687	4,609,309	-3.4%	Shares	Sole	2025-11-14
2025-06-30	$6,772,418	4,769,309	-5.5%	Shares	Sole	2025-08-14
2025-03-31	$7,720,852	5,046,309	-18.7%	Shares	Sole	2025-05-15
2024-12-31	$15,386,686	6,204,309	+125.3%	Shares	Sole	2025-02-14
2024-09-30	$3,166,519	2,753,495	0.0%	Shares	Sole	2024-11-14
2024-06-30	$3,028,844	2,753,495	0.0%	Shares	Sole	2024-08-14
2024-03-31	$3,414,333	2,753,495	-8.2%	Shares	Sole	2024-05-15
2023-12-31	$3,148,419	2,998,495	-24.3%	Shares	Sole	2024-02-14
2023-09-30	$27,129,075	3,960,449	-0.0%	Shares	Sole	2023-11-14
2023-06-30	$41,084,374	3,961,849	0.0%	Shares	Sole	2023-08-14
2023-03-31	$32,051,358	3,961,849	+0.0%	Shares	Sole	2023-05-15
2022-12-31	$62,389,671	3,961,249	0.0%	Shares	Sole	2023-02-14
2022-09-30	$62,350,059	3,961,249	+0.9%	Shares	Sole	2022-11-14
2022-06-30	$54,823,000	3,927,149	+1.6%	Shares	Sole	2022-08-15
2022-03-31	$66,633,186	3,865,034	+0.1%	Shares	Sole	2022-05-16
2021-12-31	$56,143,985	3,861,347	+1.5%	Shares	Sole	2022-02-14
2021-09-30	$68,458,176	3,803,232	+1.1%	Shares	Sole	2021-11-15
2021-06-30	$66,066,198	3,762,312	+5.4%	Shares	Sole	2021-08-16
2021-03-31	$89,943,638	3,569,192	+33.4%	Shares	Sole	2021-05-17
2020-12-31	$17,314,367	2,676,100	+28.9%	Shares	Sole	2021-02-16
2020-09-30	$5,336,108	2,076,307	+26.3%	Shares	Sole	2020-11-16
2020-06-30	$2,663,304	1,644,015	+2.8%	Shares	Sole	2020-08-14
2020-03-31	$1,664,000	1,600,000	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.