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iRhythm Technologies
IRTC

Overview Fund Activity

297 hedge funds and large institutions have $5.4B invested in iRhythm Technologies in 2025 Q2 according to their latest regulatory filings, with 69 funds opening new positions, 99 increasing their positions, 92 reducing their positions, and 22 closing their positions.

Holders
297
Holders Change
+42
Holders Change %
+16.47%
% of All Funds
3.99%
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
99
Reduced
92
Closed
22
Calls
$21.6M
Puts
$29.6M
Net Calls
-$8.01M
Net Calls Change
+$1.55M

Top Buyers

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

Top Sellers

1
Capital Research Global Investors
1
Capital Research Global Investors
California
$232M
2
Mackenzie Financial
2
Mackenzie Financial
Ontario, Canada
$112M
3
Westfield Capital Management
3
Westfield Capital Management
Massachusetts
$44.7M
4
UBS AM
4
UBS AM
Illinois
$93.6M
5
B
5
Braidwell
Connecticut
$46.2M
Name Market Value Shares Shares
Change 		Shares
Change %
Squarepoint
51
Squarepoint
New York
$24.7M 160,449 +130,490 +436%
FGP
52
Freestone Grove Partners
California
$23.8M 154,317 +17,345 +13%
Renaissance Technologies
53
Renaissance Technologies
New York
$21.7M 141,200 +119,100 +539%
SBH
54
Segall Bryant & Hamill
Illinois
$21.1M 137,293 +6,545 +5%
Ameriprise
55
Ameriprise
Minnesota
$20.8M 135,288 +66,611 +97%
Massachusetts Financial Services
56
Massachusetts Financial Services
Massachusetts
$19.5M 126,455 +126,455 New
Raymond James Financial
57
Raymond James Financial
Florida
$17.9M 116,467 +6,341 +6%
CSS
58
Cubist Systematic Strategies
Connecticut
$17M 110,727 +67,010 +153%
FCM
59
Frontier Capital Management
Massachusetts
$16.4M 106,415 -118,495 -53%
Citadel Advisors
60
Citadel Advisors
Florida
$15.4M 100,023 +96,921 +3,124%
Invesco
61
Invesco
Georgia
$14.5M 94,298 +72,082 +324%
Jane Street
62
Jane Street
New York
$13.6M 88,168 +42,415 +93%
PHS
63
PFM Health Sciences
California
$13.6M 88,157 +88,157 New
Verition Fund Management
64
Verition Fund Management
Connecticut
$13.5M 87,511 -78,961 -47%
OAM
65
Oberweis Asset Management
Illinois
$12.5M 81,200 +81,200 New
CWG
66
C WorldWide Group
Denmark
$12.3M 80,000 – –
Principal Financial Group
67
Principal Financial Group
Iowa
$12.2M 79,169 +28,720 +57%
Royal Bank of Canada
68
Royal Bank of Canada
Ontario, Canada
$12M 77,721 +70,148 +926%
WCM Investment Management
69
WCM Investment Management
California
$11.9M 77,170 -61,267 -44%
PCM
70
Peregrine Capital Management
Minnesota
$11.8M 76,594 -6,461 -8%
Adage Capital Partners
71
Adage Capital Partners
Massachusetts
$11.5M 75,000 -25,000 -25%
EGM
72
Engineers Gate Manager
New York
$11.5M 74,842 +20,266 +37%
MGP
73
M&G plc
United Kingdom
$11.5M 74,398 +74,398 New
Walleye Capital
74
Walleye Capital
New York
$11.4M 73,822 +73,822 New
TCM
75
TimesSquare Capital Management
New York
$11M 71,660 +71,660 New
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