Rock Springs Capital Management LP

Position in DYN — Dyne Therapeutics, Inc.

CIK 1595725 Baltimore, MD

Position in DYN

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

Position Value

$20,925,240

+$3,299,291 QoQ

Shares Held

942,154

-3.1% QoQ

Ownership

0.505%

of shares outstanding

% of Portfolio

1.02%

of 13F equity value

Holder Rank

#42

of 245 holders

Holding Since

Mar 2024

10 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

Rock Springs Capital Management LP holds $1,502,002,537 across 70 Biotechnology names. DYN ranks #21 (1.4% 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

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$20,925,240	942,154	-3.1%	Shares	Sole	2026-08-14
2026-03-31	$17,625,949	972,198	+6.5%	Shares	Sole	2026-05-15
2025-12-31	$17,857,399	912,955	+10.8%	Shares	Sole	2026-02-17
2025-09-30	$10,424,371	824,061	+41.8%	Shares	Sole	2025-11-14
2025-06-30	$5,531,100	580,998	+10.8%	Shares	Sole	2025-08-14
2025-03-31	$5,486,259	524,499	+10.5%	Shares	Sole	2025-05-15
2024-12-31	$11,179,879	474,528	+2.9%	Shares	Sole	2025-02-14
2024-09-30	$16,560,125	461,028	0.0%	Shares	Sole	2024-11-14
2024-06-30	$16,269,678	461,028	+2.0%	Shares	Sole	2024-08-14
2024-03-31	$12,827,283	451,824	—	Shares	Sole	2024-05-15
No filing history on record for this holder in this stock.