LOOMIS SAYLES & CO L P

Position in IRTC — iRhythm Holdings, Inc.

CIK 312348 BOSTON, MA

Position in IRTC

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$43,418,849

-$26,151,292 QoQ

Shares Held

367,894

-6.2% QoQ

Ownership

1.12%

of shares outstanding

% of Portfolio

0.06%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

10 quarters on record

Voting authority Sole 98.0918416717859.ToString("F0")% Shared 0.ToString("F0")% None 1.9081583282141052.ToString("F0")%

Healthcare · as of Mar 31, 2026

LOOMIS SAYLES & CO L P holds $142,136,158 across 12 Medical Devices names. IRTC ranks #2 (30.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GKOS	GLAUKOS Corp	421,240	$45,350,697
2	IRTC	iRhythm Holdings, Inc. This page	367,894	$43,418,849
3	AORT	Artivion, Inc.	980,439	$35,903,675
4	BRKR	Bruker Corp	456,773	$16,498,640
5	STE	STERIS plc	1,883	$416,386
6	PODD	Insulet Corp	1,243	$260,830
7	PEN	Penumbra Inc	358	$117,555
8	MDT	Medtronic plc	801	$69,406

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$43,418,849	367,894	-6.2%	Shares	Defined	2026-05-14
2025-12-31	$69,570,141	392,077	+35.4%	Shares	Defined	2026-02-12
2025-09-30	$49,802,799	289,568	+13.3%	Shares	Defined	2025-11-13
2025-06-30	$39,339,397	255,517	+115.6%	Shares	Defined	2025-08-13
2024-09-30	$8,797,588	118,502	-68.0%	Shares	Defined	2024-11-13
2024-06-30	$39,879,543	370,490	+21.1%	Shares	Defined	2024-08-13
2024-03-31	$35,489,272	305,942	+25.2%	Shares	Defined	2024-05-14
2020-09-30	$58,175,748	244,323	+24.4%	Shares	Defined	2020-11-12
2020-06-30	$22,759,752	196,391	+33.4%	Shares	Defined	2020-08-14
2020-03-31	$11,972,441	147,172	—	Shares	Defined	2020-05-15
No filing history on record for this holder in this stock.