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iRhythm Holdings
IRTC

256 hedge funds and large institutions have $3.77B invested in iRhythm Holdings in 2025 Q1 according to their latest regulatory filings, with 53 funds opening new positions, 80 increasing their positions, 84 reducing their positions, and 22 closing their positions.

New
Increased
Maintained
Reduced
Closed

141% more first-time investments, than exits

New positions opened: 53 | Existing positions closed: 22

50% more funds holding in top 10

Funds holding in top 10: 2 → 3 (+1)

22% more capital invested

Capital invested by funds: $3.09B → $3.77B (+$673M)

13% more funds holding

Funds holding: 227 → 256 (+29)

4.88% more ownership

Funds ownership: 109.68% → 114.56% (+4.9%)

5% less repeat investments, than reductions

Existing positions increased: 80 | Existing positions reduced: 84

40% less call options, than puts

Call options by funds: $14.4M | Put options by funds: $24M

Holders
256
Holders Change
+29
Holders Change %
+12.78%
% of All Funds
3.43%
Holding in Top 10
3
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+50%
% of All Funds
0.04%
New
53
Increased
80
Reduced
84
Closed
22
Calls
$14.4M
Puts
$24M
Net Calls
-$9.56M
Net Calls Change
+$4.76M

Top Buyers

1
UBS AM
UBS AM
Illinois
+$60.2M
2
Capital Research Global Investors
Capital Research Global Investors
California
+$59.9M
3
Fuller & Thaler Asset Management
Fuller & Thaler Asset Management
California
+$54.9M
4
Point72 Asset Management
Point72 Asset Management
Connecticut
+$44.5M
5
Millennium Management
Millennium Management
New York
+$36M

Top Sellers

1
Citadel Advisors
Citadel Advisors
Florida
-$31.8M
2
Alyeska Investment Group
Alyeska Investment Group
Illinois
-$31.7M
3
Mackenzie Financial
Mackenzie Financial
Ontario, Canada
-$23.9M
4
Sands Capital Management
Sands Capital Management
Virginia
-$17M
5
B
Braidwell
Connecticut
-$15.8M
Name Holding Trade Value Shares
Change 		Change in
Stake
CSS
76
Cubist Systematic Strategies
Connecticut
$4.58M +$4.63M +43,717 New
Legal & General Group
77
Legal & General Group
United Kingdom
$4.49M -$213K -2,015 -4%
SFI
78
Susquehanna Fundamental Investments
Pennsylvania
$4.44M +$58.3K +550 +1%
CCM
79
Cinctive Capital Management
New York
$3.9M +$3.08M +29,119 +358%
AllianceBernstein
80
AllianceBernstein
Tennessee
$3.86M -$304K -2,870 -7%
Envestnet Asset Management
81
Envestnet Asset Management
Illinois
$3.75M +$2.06M +19,447 +119%
Mirae Asset Global ETFs Holdings
82
Mirae Asset Global ETFs Holdings
Hong Kong
$3.69M +$97.7K +922 +3%
EAM
83
EFG Asset Management
Oregon
$3.64M +$676K +6,378 +22%
First Trust Advisors
84
First Trust Advisors
Illinois
$3.54M +$3.59M +33,860 New
HA
85
Homestead Advisers
Virginia
$3.39M +$455K +4,300 +15%
Squarepoint
86
Squarepoint
New York
$3.14M +$815K +7,694 +35%
California State Teachers Retirement System (CalSTRS)
87
California State Teachers Retirement System (CalSTRS)
California
$3.02M -$42.4K -400 -1%
MSK
88
Melissa S. Kampmann
$2.62M +$117K +1,100 +5%
FCM
89
Fieldview Capital Management
Michigan
$2.53M +$2.56M +24,203 New
Wells Fargo
90
Wells Fargo
California
$2.51M +$320K +3,021 +14%
T. Rowe Price Associates
91
T. Rowe Price Associates
Maryland
$2.4M +$218K +2,059 +10%
Invesco
92
Invesco
Georgia
$2.33M +$319K +3,016 +16%
Renaissance Technologies
93
Renaissance Technologies
New York
$2.31M +$2.34M +22,100 New
DAM
94
DLD Asset Management
New York
$2.3M -$1.3M -12,240 -36%
JFG
95
Jefferies Financial Group
New York
$2.29M +$2.31M +21,844 New
Russell Investments Group
96
Russell Investments Group
United Kingdom
$2.18M -$150K -1,418 -6%
TI
97
Trexquant Investment
Connecticut
$2.18M +$2.2M +20,791 New
MOACM
98
Mutual of America Capital Management
New York
$2.17M +$7.31K +69 +0.3%
HP
99
HealthInvest Partners
Sweden
$2.15M +$2.18M +20,547 New
BMSSC
100
B. Metzler seel. Sohn & Co
Germany
$2.15M – – –
2 3
4
5 6

IRTC Hedge Fund Activity: Q1 2025 in Review

256 of the 7,457 institutional investors tracked by Wall St. Rank reported a position in iRhythm Holdings (IRTC) for Q1 2025, worth a combined $3.77B — up 22% from $3.09B a quarter earlier.

Buyers outnumbered sellers: 53 funds opened new IRTC positions and 22 closed out — a net gain of 31 holders — while 80 added to existing stakes and 84 trimmed.

The largest buyer was UBS AM, adding an estimated $60.2M. The largest seller was Citadel Advisors, cutting an estimated $31.8M.

  • 256 institutional investors held iRhythm Holdings (IRTC) as of Q1 2025, up from 227 in Q4 2024.
  • Funds reported $3.77B of iRhythm Holdings stock for Q1 2025, up 22% quarter-over-quarter.
  • 53 funds opened new iRhythm Holdings positions in Q1 2025 and 22 closed out, a net change of +31 holders.
  • The largest iRhythm Holdings buyer in Q1 2025 was UBS AM, an estimated $60.2M added.
  • The largest iRhythm Holdings seller in Q1 2025 was Citadel Advisors, an estimated $31.8M sold.

Based on aggregated 13F filings for Q1 2025.