iRhythm Holdings
IRTC
337 hedge funds and large institutions have $5.96B invested in iRhythm Holdings in 2025 Q3 according to their latest regulatory filings, with 63 funds opening new positions, 110 increasing their positions, 114 reducing their positions, and 28 closing their positions.
125% more first-time investments, than exits
New positions opened: 63 | Existing positions closed: 28
11% more funds holding
Funds holding: 303 → 337 (+34)
10% more capital invested
Capital invested by funds: $5.44B → $5.96B (+$520M)
4% less repeat investments, than reductions
Existing positions increased: 110 | Existing positions reduced: 114
2.83% less ownership
Funds ownership: 110.86% → 108.02% (-2.8%)
44% less call options, than puts
Call options by funds: $24.5M | Put options by funds: $44.1M
60% less funds holding in top 10
Funds holding in top 10: 5 → 2 (-3)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Arrowstreet Capital
Boston,
Massachusetts
|
+$84.7M |
| 2 |
PCH
Polar Capital Holdings
London,
United Kingdom
|
+$53.2M |
| 3 |
T. Rowe Price Associates
Baltimore,
Maryland
|
+$49.8M |
| 4 |
Invesco
Atlanta,
Georgia
|
+$49.1M |
| 5 |
Fidelity Investments
Boston,
Massachusetts
|
+$32.4M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Sands Capital Management
Arlington,
Virginia
|
-$108M |
| 2 |
Capital Research Global Investors
Los Angeles,
California
|
-$51.4M |
| 3 |
CIP
Champlain Investment Partners
Burlington,
Vermont
|
-$47M |
| 4 |
Mackenzie Financial
Toronto Ontario,
Ontario, Canada
|
-$43.6M |
| 5 |
Bank of New York Mellon
New York
|
-$39.8M |
IRTC Hedge Fund Activity: Q3 2025 in Review
337 of the 7,619 institutional investors tracked by Wall St. Rank reported a position in iRhythm Holdings (IRTC) for Q3 2025, worth a combined $5.96B — up 9.6% from $5.44B a quarter earlier.
Buyers outnumbered sellers: 63 funds opened new IRTC positions and 28 closed out — a net gain of 35 holders — while 110 added to existing stakes and 114 trimmed.
The largest buyer was Arrowstreet Capital, adding an estimated $84.7M. The largest seller was Sands Capital Management, cutting an estimated $108M.
- 337 institutional investors held iRhythm Holdings (IRTC) as of Q3 2025, up from 303 in Q2 2025.
- Funds reported $5.96B of iRhythm Holdings stock for Q3 2025, up 9.6% quarter-over-quarter.
- 63 funds opened new iRhythm Holdings positions in Q3 2025 and 28 closed out, a net change of +35 holders.
- The largest iRhythm Holdings buyer in Q3 2025 was Arrowstreet Capital, an estimated $84.7M added.
- The largest iRhythm Holdings seller in Q3 2025 was Sands Capital Management, an estimated $108M sold.
Based on aggregated 13F filings for Q3 2025.