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iRhythm Technologies
IRTC

Overview Fund Activity

300 hedge funds and large institutions have $5.44B invested in iRhythm Technologies in 2025 Q2 according to their latest regulatory filings, with 69 funds opening new positions, 101 increasing their positions, 93 reducing their positions, and 22 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
300
Holders Change
+45
Holders Change %
+17.65%
% of All Funds
4.02%
Holding in Top 10
5
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+66.67%
% of All Funds
0.07%
New
69
Increased
101
Reduced
93
Closed
22
Calls
$27.3M
Puts
$37.6M
Net Calls
-$10.3M
Net Calls Change
-$787K

Top Buyers

1
Holocene Advisors
Holocene Advisors
New York
$48.2M
2
Man Group
Man Group
United Kingdom
$41.2M
3
Loomis, Sayles & Company
Loomis, Sayles & Company
Massachusetts
$39.3M
4
D.E. Shaw & Co
D.E. Shaw & Co
New York
$38.2M
5
Wellington Management Group
Wellington Management Group
Massachusetts
$60.9M

Top Sellers

1
Capital Research Global Investors
Capital Research Global Investors
California
$232M
2
Mackenzie Financial
Mackenzie Financial
Ontario, Canada
$112M
3
Westfield Capital Management
Westfield Capital Management
Massachusetts
$44.7M
4
UBS AM
UBS AM
Illinois
$93.6M
5
B
Braidwell
Connecticut
$46.2M
Name Holding Trade Value Shares
Change 		Shares
Change %
DCM
51
Driehaus Capital Management
Illinois
$24.9M +$24.9M +161,646 New
Squarepoint
52
Squarepoint
New York
$24.7M +$20.1M +130,490 +436%
FGP
53
Freestone Grove Partners
California
$23.8M +$2.67M +17,345 +13%
Renaissance Technologies
54
Renaissance Technologies
New York
$21.7M +$18.3M +119,100 +539%
SBH
55
Segall Bryant & Hamill
Illinois
$21.1M +$1.01M +6,545 +5%
Ameriprise
56
Ameriprise
Minnesota
$20.8M +$10.3M +66,611 +97%
Massachusetts Financial Services
57
Massachusetts Financial Services
Massachusetts
$19.5M +$19.5M +126,455 New
Raymond James Financial
58
Raymond James Financial
Florida
$17.9M +$976K +6,341 +6%
CSS
59
Cubist Systematic Strategies
Connecticut
$17M +$10.3M +67,010 +153%
FCM
60
Frontier Capital Management
Massachusetts
$16.4M -$18.2M -118,495 -53%
Citadel Advisors
61
Citadel Advisors
Florida
$15.4M +$14.9M +96,921 +3,124%
Invesco
62
Invesco
Georgia
$14.5M +$11.1M +72,082 +324%
Jane Street
63
Jane Street
New York
$13.6M +$6.53M +42,415 +93%
PHS
64
PFM Health Sciences
California
$13.6M +$13.6M +88,157 New
Verition Fund Management
65
Verition Fund Management
Connecticut
$13.5M -$12.2M -78,961 -47%
OAM
66
Oberweis Asset Management
Illinois
$12.5M +$12.5M +81,200 New
CWG
67
C WorldWide Group
Denmark
$12.3M – – –
Principal Financial Group
68
Principal Financial Group
Iowa
$12.2M +$4.42M +28,720 +57%
Royal Bank of Canada
69
Royal Bank of Canada
Ontario, Canada
$12M +$10.8M +70,148 +926%
WCM Investment Management
70
WCM Investment Management
California
$11.9M -$9.48M -61,267 -44%
PCM
71
Peregrine Capital Management
Minnesota
$11.8M -$995K -6,461 -8%
Adage Capital Partners
72
Adage Capital Partners
Massachusetts
$11.5M -$3.85M -25,000 -25%
EGM
73
Engineers Gate Manager
New York
$11.5M +$3.12M +20,266 +37%
MGP
74
M&G plc
United Kingdom
$11.5M +$11.5M +74,398 New
Walleye Capital
75
Walleye Capital
New York
$11.4M +$11.4M +73,822 New
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