Granahan Investment Management, LLC

Position in IRTC — iRhythm Holdings, Inc.

CIK 1026710 WALTHAM, MA

Position in IRTC

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

Position Value

$11,332,516

+$8,781,462 QoQ

Shares Held

96,022

+567.9% QoQ

Ownership

0.292%

of shares outstanding

% of Portfolio

0.55%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2020

8 quarters on record

Voting authority Sole 92.2330299306409.ToString("F0")% Shared 0.ToString("F0")% None 7.766970069359106.ToString("F0")%

Healthcare · as of Mar 31, 2026

Granahan Investment Management, LLC holds $63,165,697 across 8 Medical Devices names. IRTC ranks #3 (17.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	SIBN	SI-BONE, Inc.	1,739,097	$21,964,795
2	KIDS	Orthopediatrics Corp	896,741	$14,231,279
3	IRTC	iRhythm Holdings, Inc. This page	96,022	$11,332,516
4	OWLT	Owlet, Inc.	1,186,655	$6,099,406
5	MASS	908 Devices Inc.	695,070	$4,253,828
6	BBNX	Beta Bionics, Inc.	248,449	$2,489,458
7	NEOG	Neogen Corp	250,026	$2,322,741
8	IRMD	Iradimed Corp	4,900	$471,674

8 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
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.