LOOMIS SAYLES & CO L P

Position in IRTC — iRhythm Holdings, Inc.

CIK 312348 BOSTON, MA

Position in IRTC

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

Position Value

$41,389,722

-$2,029,127 QoQ

Shares Held

347,959

-5.4% QoQ

Ownership

1.06%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

#26

of 301 holders

Holding Since

Mar 2020

11 quarters on record

Voting authority Sole 98% Shared 0% None 2%

Healthcare · as of Jun 30, 2026

LOOMIS SAYLES & CO L P holds $110,481,292 across 7 Medical Devices names. IRTC ranks #2 (37.5% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GKOS	GLAUKOS Corp	469,388	$65,601,665
2	IRTC	iRhythm Holdings, Inc. This page	347,959	$41,389,722
3	BRKR	Bruker Corp	54,702	$3,291,966
4	ABT	Abbott Laboratories	1,506	$136,654
5	ZBH	Zimmer Biomet Holdings, Inc.	372	$32,025
6	MDT	Medtronic plc	200	$15,646
7	BSX	Boston Scientific Corp	319	$13,614

11 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$41,389,722	347,959	-5.4%	Shares	Defined	2026-08-14
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.