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iRhythm Holdings

334 hedge funds and large institutions have $6.24B invested in iRhythm Holdings in 2025 Q4 according to their latest regulatory filings, with 46 funds opening new positions, 109 increasing their positions, 122 reducing their positions, and 42 closing their positions.

New
Increased
Maintained
Reduced
Closed

1.14% more ownership

Funds ownership: 108.02%109.16% (+1.1%)

10% more first-time investments, than exits

New positions opened: 46 | Existing positions closed: 42

5% more capital invested

Capital invested by funds: $5.96B → $6.24B (+$278M)

0% more funds holding in top 10

Funds holding in top 10: 22 (0)

1% less funds holding

Funds holding: 337334 (-3)

11% less repeat investments, than reductions

Existing positions increased: 109 | Existing positions reduced: 122

67% less call options, than puts

Call options by funds: $7M | Put options by funds: $21.3M

Holders
334
Holders Change
-3
Holders Change %
-0.89%
% of All Funds
4.06%
Holding in Top 10
2
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
0.02%
New
46
Increased
109
Reduced
122
Closed
42
Calls
$7M
Puts
$21.3M
Net Calls
-$14.3M
Net Calls Change
+$5.32M
Name Holding Trade Value Shares
Change
Change in
Stake
Vanguard Group
1
Vanguard Group
Pennsylvania
$587M +$12.5M +70,420 +2%
BlackRock
2
BlackRock
New York
$499M -$10.9M -61,487 -2%
Sands Capital Management
3
Sands Capital Management
Virginia
$302M -$95.1M -536,465 -24%
Artisan Partners
4
Artisan Partners
Wisconsin
$268M -$187M -1,055,521 -41%
Capital Research Global Investors
5
Capital Research Global Investors
California
$210M +$179K +1,010 +0.1%
RI
6
RTW Investments
New York
$210M +$209M +1,181,990 New
Geode Capital Management
7
Geode Capital Management
Massachusetts
$152M +$12.1M +68,301 +9%
UBS AM
8
UBS AM
Illinois
$147M +$46M +259,800 +46%
Millennium Management
9
Millennium Management
New York
$147M +$97.2M +548,519 +197%
State Street
10
State Street
Massachusetts
$136M -$14.7M -83,039 -10%
JP Morgan Chase
11
JP Morgan Chase
New York
$135M +$56.6M +319,149 +73%
William Blair & Company
12
William Blair & Company
Illinois
$128M -$3.89M -21,924 -3%
EAM
13
Eventide Asset Management
Massachusetts
$123M +$173K +974 +0.1%
Holocene Advisors
14
Holocene Advisors
New York
$121M +$37.3M +210,288 +44%
Fuller & Thaler Asset Management
15
Fuller & Thaler Asset Management
California
$113M +$7.83M +44,175 +7%
Fidelity Investments
16
Fidelity Investments
Massachusetts
$112M +$828K +4,671 +0.7%
Arrowstreet Capital
17
Arrowstreet Capital
Massachusetts
$108M +$11.7M +65,930 +12%
BNP Paribas Asset Management
18
BNP Paribas Asset Management
France
$103M +$2.26M +12,760 +2%
SIMG
19
Stephens Investment Management Group
Texas
$92.1M -$112K -633 -0.1%
T. Rowe Price Associates
20
T. Rowe Price Associates
Maryland
$89.1M +$28.8M +162,479 +48%
Invesco
21
Invesco
Georgia
$88.4M +$16.9M +95,248 +24%
Wellington Management Group
22
Wellington Management Group
Massachusetts
$72.4M -$2.55M -14,406 -3%
Allspring Global Investments
23
Allspring Global Investments
North Carolina
$71.4M -$1.44M -8,108 -2%
Loomis, Sayles & Company
24
Loomis, Sayles & Company
Massachusetts
$69.6M +$18.2M +102,509 +35%
D.E. Shaw & Co
25
D.E. Shaw & Co
New York
$64M +$4.17M +23,544 +7%