Rock Springs Capital Management LP

Position in IRTC — iRhythm Holdings, Inc.

CIK 1595725 Baltimore, MD

Position in IRTC

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

Position Value

$30,891,735

-$10,806,665 QoQ

Shares Held

261,750

+11.4% QoQ

Ownership

0.797%

of shares outstanding

% of Portfolio

1.82%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Healthcare · as of Mar 31, 2026

Rock Springs Capital Management LP holds $142,910,763 across 8 Medical Devices names. IRTC ranks #3 (21.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PEN	Penumbra Inc	120,500	$39,568,585
2	BSX	Boston Scientific Corp	515,300	$32,335,075
3	IRTC	iRhythm Holdings, Inc. This page	261,750	$30,891,735
4	DXCM	Dexcom Inc	355,600	$22,331,680
5	INSP	Inspire Medical Systems, Inc.	131,800	$6,798,244
6	SYK	Stryker Corp	14,800	$4,863,132
7	ATEC	Alphatec Holdings, Inc.	350,000	$3,808,000
8	EW	Edwards Lifesciences Corp	28,900	$2,314,312

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$30,891,735	261,750	+11.4%	Shares	Sole	2026-05-15
2025-12-31	$41,698,400	235,000	0.0%	Shares	Sole	2026-02-17
2025-09-30	$40,417,650	235,000	-3.1%	Shares	Sole	2025-11-14
2025-06-30	$37,335,300	242,500	-4.6%	Shares	Sole	2025-08-14
2025-03-31	$26,620,124	254,300	-36.0%	Shares	Sole	2025-05-15
2024-12-31	$35,842,575	397,500	0.0%	Shares	Sole	2025-02-14
2024-09-30	$29,510,400	397,500	0.0%	Shares	Sole	2024-11-14
2024-06-30	$42,786,900	397,500	+1.3%	Shares	Sole	2024-08-14
2024-03-31	$45,501,000	392,250	+11.8%	Shares	Sole	2024-05-15
2023-12-31	$37,544,280	350,750	0.0%	Shares	Sole	2024-02-14
2023-09-30	$33,061,695	350,750	+13.3%	Shares	Sole	2023-11-14
2023-06-30	$32,281,824	309,450	0.0%	Shares	Sole	2023-08-14
2023-03-31	$38,381,083	309,450	0.0%	Shares	Sole	2023-05-15
2022-12-31	$28,986,181	309,450	+5.5%	Shares	Sole	2023-02-14
2022-09-30	$36,738,360	293,250	+8.6%	Shares	Sole	2022-11-14
2022-06-30	$29,168,100	270,000	-38.1%	Shares	Sole	2022-08-15
2022-03-31	$68,656,920	436,000	+0.7%	Shares	Sole	2022-05-16
2021-12-31	$50,959,770	433,000	-3.3%	Shares	Sole	2022-02-14
2021-09-30	$26,234,880	448,000	0.0%	Shares	Sole	2021-11-15
2021-06-30	$29,724,800	448,000	+3.6%	Shares	Sole	2021-08-16
2021-03-31	$60,056,394	432,496	-30.8%	Shares	Sole	2021-05-17
2020-12-31	$148,256,250	625,000	0.0%	Shares	Sole	2021-02-16
2020-09-30	$148,818,750	625,000	-4.0%	Shares	Sole	2020-11-16
2020-06-30	$75,444,390	651,000	+0.9%	Shares	Sole	2020-08-14
2020-03-31	$52,470,750	645,000	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.