iRhythm Technologies

IRTC • NASDAQ

iRhythm Technologies is a medical - devices company in the healthcare sector on NASDAQ, led by Doug J. Devine, with a market cap of $5.8B. As of Q3 2025, 108% of shares are held by 327 institutional investors, with VANGUARD GROUP INC as the largest holder at 10.09%.

Interim Chief Executive OfficerDoug J. Devine

Market Cap$5.8B

Medical - Devices

Healthcare

Employees2.0K

Websiteirhythmtech.com

Country

United States of America

Overview

Overview of institutional ownership in IRTC as of Q3 2025 with a market cap of $5.5B

All Institutions

Institutions: 327
Value Held: $6.0B
Shares Held: 34.8M
Avg Position: $18.3M
Median Position: $1.2M

Hedge Funds

Hedge Funds: 50
Value Held: $674.4M
Shares Held: 3.9M
Avg Position: $13.5M
Median Position: $3.5M

Ownership Breakdown

Institutional (non-HF)

96.13%

$5.3B

Hedge Funds

12.2%

$674.4M

Retail & Other

Based on market cap of $5.5B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in IRTC as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
VANGUARD GROUP INC Institution	Salim Ramji CEO	$557.3M 0.01% of portfolio	10.09% 3.2M shares	Q4 2016 Held for 8y 11m	$6.69T
B BlackRock, Inc. Institution	-	$494.6M 0.01% of portfolio	8.95% 2.9M shares	Q4 2016 Held for 8y 11m	$5.67T
Artisan Partners Limited Partnership Long Only Manager	Eric Richard Colson CEO	$441.6M 0.64% of portfolio	7.99% 2.6M shares	Q4 2021 Held for 3y 11m	$69.5B
SANDS CAPITAL MANAGEMENT, LLC Long Only Manager	Frank Melville Sands CEO	$384.6M 1.06% of portfolio	6.96% 2.2M shares	Q3 2020 Held for 5y 2m	$36.2B
Capital Research Global Investors RIA/Wealth	Sardar Sheraz Iftikhar CEO	$203.6M 0.04% of portfolio	3.68% 1.2M shares	Q4 2016 Held for 8y 11m	$532.36B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$145.8M 0.01% of portfolio	2.64% 847.9K shares	Q4 2016 Held for 8y 11m	$2.88T
GEODE CAPITAL MANAGEMENT LLC ETF Provider	David Kenneth Lane CEO	$135.9M 0.01% of portfolio	2.46% 790.1K shares	Q4 2016 Held for 8y 11m	$1.57T
B BLAIR WILLIAM & CO/IL Institution	-	$127.4M 0.34% of portfolio	2.31% 740.7K shares	Q4 2019 Held for 5y 11m	$37.6B
E EVENTIDE ASSET MANAGEMENT, LLC Long Only Manager	Robin Cheriakalath John CEO	$118.9M 1.96% of portfolio	2.15% 691.5K shares	Q2 2022 Held for 3y 5m	$6.1B
FMR LLC Institution	-	$107.3M 0.01% of portfolio	1.94% 624.1K shares	Q4 2016 Held for 8y 11m	$1.92T

Net Capital Flow

Institutional buying and selling activity for IRTC in Q3 2025

Net Flow: −$212.3M
Buyers: 111
Sellers: 141
Total Bought: +$529.0M
Total Sold: −$741.2M
Avg Position: $19.7M

Biggest Buyers

Institution	Net Bought	Current Position
ARROWSTREET CAPITAL LIMITED PARTNERSHIP Hedge Fund•Quant	+$91.6M +532.7K shares	$93.1M 541.0K shares
Polar Capital Holdings Plc Long Only Manager	+$57.5M +334.6K shares	$57.8M 335.9K shares
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	+$53.9M +313.4K shares	$58.4M 339.6K shares
Invesco Ltd. ETF Provider	+$53.1M +308.8K shares	$69.3M 403.1K shares
FMR LLC Institution	+$35.1M +203.9K shares	$107.3M 624.1K shares
Holocene Advisors, LP Hedge Fund•Long/Short	+$27.6M +160.2K shares	$81.4M 473.3K shares
B BlackRock, Inc. Institution	+$21.6M +125.8K shares	$494.6M 2.9M shares
Q Qube Research & Technologies Ltd Institution	+$20.5M +119.4K shares	$28.7M 166.9K shares
D D. E. Shaw & Co., Inc. Institution	+$15.4M +89.3K shares	$58.0M 337.1K shares
R ROYAL BANK OF CANADA Institution	+$10.3M +60.2K shares	$23.7M 137.9K shares

Biggest Sellers

Institution	Net Sold	Current Position
SANDS CAPITAL MANAGEMENT, LLC Long Only Manager	−$116.9M −679.4K shares	$384.6M 2.2M shares
Capital Research Global Investors RIA/Wealth	−$55.6M −323.1K shares	$203.6M 1.2M shares
C Champlain Investment Partners, LLC Long Only Manager	−$50.8M −295.6K shares	$62.9M 365.6K shares
MACKENZIE FINANCIAL CORP Long Only Manager	−$47.2M −274.6K shares	$78.3M 455.3K shares
Bank of New York Mellon Corp Institution	−$43.0M −250.2K shares	$17.1M 99.2K shares
Artisan Partners Limited Partnership Long Only Manager	−$29.8M −173.3K shares	$441.6M 2.6M shares
B BNP Paribas Investment Partners S.A. Institution	−$28.3M −164.4K shares	$98.1M 570.3K shares
JENNISON ASSOCIATES LLC Long Only Manager	−$24.1M −140.2K shares	$27.0M 157.3K shares
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	−$23.8M −154.3K shares	Sold Off 0 shares
B BESSEMER GROUP INC Institution	−$23.2M −135.0K shares	$74.7M 434.2K shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited IRTC in Q3 2025

New Positions: 27
New Value: $45.0M
Exited Positions: 29
Exited Value: $60.1M

New Positions

Institution	Position Value
Jain Global LLC Hedge Fund•Multi-Strategy	$22.5M 131.1K shares
S STEADFAST CAPITAL MANAGEMENT LP Hedge Fund•Long/Short	$6.8M 39.7K shares
G GCIC Ltd. Institution	$4.9M 28.2K shares
O OSSIAM Institution	$4.7M 27.1K shares
Williamson Legacy Group, LLC RIA/Wealth	$1.3M 7.7K shares
Rhenman & Partners Asset Management AB RIA/Wealth	$1.2M 7.0K shares
Legato Capital Management LLC Fund of Funds	$539.2K 3.1K shares
Counterpoint Mutual Funds LLC ETF Provider	$498.8K 2.9K shares
Voleon Capital Management LP Hedge Fund•Quant	$377.0K 2.2K shares
S State of Alaska, Department of Revenue Institution	$344.3K 2.0K shares

Exited Positions

Institution	Previous Position
F Freestone Grove Partners LP Hedge Fund•Multi-Strategy	$23.8M 154.3K shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$10.0M 64.7K shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$6.9M 44.7K shares
N NATIXIS Institution	$3.6M 23.5K shares
X XTX Topco Ltd Institution	$2.5M 16.5K shares
KENNEDY CAPITAL MANAGEMENT, INC. Long Only Manager	$2.4M 15.8K shares
W Winton Capital Group Ltd Institution	$2.0M 12.9K shares
Semanteon Capital Management, LP Hedge Fund•Long/Short	$1.5M 10.0K shares
Centiva Capital, LP Hedge Fund•Multi-Strategy	$1.5M 9.6K shares
UBS OCONNOR LLC Long Only Manager	$1.2M 8.0K shares

Options Activity

Institutions with the largest Call and Put options positions in IRTC as of Q3 2025

Call Positions: 11
Call Value: $23.4M
Put Positions: 9
Put Value: $34.6M

Call Positions

Institution	Position Value
J JANE STREET GROUP, LLC Institution	$11.1M 644.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$7.4M 433.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$4.5M 261.0 contracts
Walleye Trading LLC RIA/Wealth	$240.8K 14.0 contracts
R Raiffeisen Bank International AG Institution	$117.0K 6.8 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$68.8K 4.0 contracts
Steel Peak Wealth Management LLC RIA/Wealth	- - contracts
W WOLVERINE TRADING, LLC Institution	- - contracts
C Cubist Systematic Strategies, LLC Institution	- - contracts
Point72 Asset Management, L.P. Hedge Fund•Multi-Strategy	- - contracts

Put Positions

Institution	Position Value
J JANE STREET GROUP, LLC Institution	$16.6M 964.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$12.7M 737.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$4.0M 230.0 contracts
S Squarepoint Ops LLC Hedge Fund•Quant	$1.3M 74.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$51.6K 3.0 contracts
WOLVERINE ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	$51.6K 3.0 contracts
Walleye Trading LLC RIA/Wealth	$17.2K 1.0 contracts
N NOMURA HOLDINGS INC Institution	- - contracts
W WOLVERINE TRADING, LLC Institution	- - contracts

Most Committed Institutions

Institutions with IRTC as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
K Kampmann Melissa S. Institution	-	3.00% $4.1M	0.07% 23.9K shares	Q3 2023 Held for 2y 2m	$137.2M
First Light Asset Management, LLC Hedge Fund•Sector	Mathew Paul Arens CEO	2.51% $26.7M	0.48% 155.1K shares	Q4 2024 Held for 11 months	$1.1B
NEXT CENTURY GROWTH INVESTORS LLC Long Only Manager	Thomas Leigh Press CEO	2.41% $32.5M	0.59% 189.1K shares	Q1 2025 Held for 8 months	$1.4B
Rock Springs Capital Management LP Hedge Fund•Sector	Nnamdi C Etoh CFO	2.37% $40.4M	0.73% 235.0K shares	Q3 2017 Held for 8y 2m	$1.7B
O Ophir Asset Management Pty Ltd Long Only Manager	Sandra Donnarumma COO	2.16% $17.5M	0.32% 101.6K shares	Q4 2024 Held for 11 months	$809.7M
H HealthInvest Partners AB Institution	-	2.12% $547.6K	0.09% 30.0K shares	Q1 2025 Held for 8 months	$25.9M
E EVENTIDE ASSET MANAGEMENT, LLC Long Only Manager	Robin Cheriakalath John CEO	1.96% $118.9M	2.15% 691.5K shares	Q2 2022 Held for 3y 5m	$6.1B
B BRAIDWELL LP Hedge Fund•Multi-Strategy	Brian James Kreiter CEO	1.57% $38.8M	0.70% 225.8K shares	Q4 2022 Held for 2y 11m	$2.5B
Stephens Investment Management Group LLC Long Only Manager	Joseph Warren Simpson CEO	1.15% $89.4M	1.62% 520.0K shares	Q4 2020 Held for 4y 11m	$7.8B
SANDS CAPITAL MANAGEMENT, LLC Long Only Manager	Frank Melville Sands CEO	1.06% $384.6M	6.96% 2.2M shares	Q3 2020 Held for 5y 2m	$36.2B

Hedge Fund Spotlight

Discover hedge funds investing in IRTC

Quantbot Technologies LLC

Hedge Fund • Quant

Portfolio ManagerPaul Edward White

Portfolio Value: $3.7B
Positions: 1,694
Last Reported: Q3 2025

Sector Allocation

Position in iRhythm Technologies

Market Value: $1.4M
Shares Held: 8.4K
Portfolio Weight: 0.04%
Owned Since: 2025-Q2

Top Holding	Sector	Market Value	Weight
1 SoFi Technologies, Inc. SOFI	Financial - Credit Services Financial Services	$29.1M	0.79%
2 Lam Research LRCX	Semiconductors Technology	$27.8M	0.75%
3 Honeywell International HON	Conglomerates Industrials	$27.6M	0.75%