Granahan Investment Management, LLC

Position in IRTC — iRhythm Holdings, Inc.

CIK 1026710 WALTHAM, MA

Position in IRTC

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

Position Value

$9,980,261

-$1,352,255 QoQ

Shares Held

83,903

-12.6% QoQ

Ownership

0.255%

of shares outstanding

% of Portfolio

0.36%

of 13F equity value

Holder Rank

#70

of 304 holders

Holding Since

Dec 2020

9 quarters on record

Voting authority Sole 94% Shared 0% None 6%

Healthcare · as of Jun 30, 2026

Granahan Investment Management, LLC holds $92,277,929 across 8 Medical Devices names. IRTC ranks #3 (10.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SIBN	SI-BONE, Inc.	1,931,182	$31,516,890
2	KIDS	Orthopediatrics Corp	1,085,964	$20,774,491
3	IRTC	iRhythm Holdings, Inc. This page	83,903	$9,980,261
4	OWLT	Owlet, Inc.	1,595,419	$9,157,705
5	IRMD	Iradimed Corp	74,966	$7,163,750
6	MASS	908 Devices Inc.	692,092	$6,021,200
7	BBNX	Beta Bionics, Inc.	299,632	$4,695,233
8	LMRI	Lumexa Imaging Holdings, Inc.	263,156	$2,968,399

9 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$9,980,261	83,903	-12.6%	Shares	Sole	2026-08-14
2026-03-31	$11,332,516	96,022	+567.9%	Shares	Sole	2026-05-15
2025-12-31	$2,551,054	14,377	-3.8%	Shares	Sole	2026-02-17
2025-09-30	$2,569,530	14,940	+18.0%	Shares	Sole	2025-11-14
2025-06-30	$1,949,749	12,664	-14.3%	Shares	Sole	2025-08-14
2025-03-31	$1,546,332	14,772	-67.7%	Shares	Sole	2025-05-15
2024-12-31	$4,123,474	45,730	-36.9%	Shares	Sole	2025-02-14
2024-09-30	$5,377,054	72,428	+490.1%	Shares	Sole	2024-11-14
2020-12-31	$2,911,515	12,274	—	Shares	Sole	2021-02-12
No filing history on record for this holder in this stock.