iRhythm Holdings
IRTC
305 hedge funds and large institutions have $4.19B invested in iRhythm Holdings in 2026 Q1 according to their latest regulatory filings, with 46 funds opening new positions, 111 increasing their positions, 105 reducing their positions, and 69 closing their positions.
33% more call options, than puts
Call options by funds: $12M | Put options by funds: $8.98M
6% more repeat investments, than reductions
Existing positions increased: 111 | Existing positions reduced: 105
0.79% more ownership
Funds ownership: 109.16% → 109.94% (+0.79%)
8% less funds holding
Funds holding: 333 → 305 (-28)
33% less capital invested
Capital invested by funds: $6.24B → $4.19B (-$2.05B)
33% less first-time investments, than exits
New positions opened: 46 | Existing positions closed: 69
50% less funds holding in top 10
Funds holding in top 10: 2 → 1 (-1)
Top Buyers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Millennium Management
New York
|
+$113M |
| 2 |
Fidelity Investments
Boston,
Massachusetts
|
+$106M |
| 3 |
Holocene Advisors
New York
|
+$81.5M |
| 4 |
RI
RTW Investments
New York
|
+$70.2M |
| 5 |
B
Braidwell
Stamford,
Connecticut
|
+$56.7M |
Top Sellers
| Rank | Fund | Capital Flow |
|---|---|---|
| 1 |
Sands Capital Management
Arlington,
Virginia
|
-$302M |
| 2 |
Capital Research Global Investors
Los Angeles,
California
|
-$97.4M |
| 3 |
T. Rowe Price Associates
Baltimore,
Maryland
|
-$67.3M |
| 4 |
Westfield Capital Management
Boston,
Massachusetts
|
-$57.7M |
| 5 |
Lord, Abbett & Co
Jersey City,
New Jersey
|
-$49.2M |
IRTC Hedge Fund Activity: Q1 2026 in Review
305 of the 8,187 institutional investors tracked by Wall St. Rank reported a position in iRhythm Holdings (IRTC) for Q1 2026, worth a combined $4.19B — down 33% from $6.24B a quarter earlier.
Sellers outnumbered buyers: 69 funds closed out of IRTC and 46 opened new positions — a net loss of 23 holders — while 105 trimmed existing stakes and 111 added.
The largest buyer was Millennium Management, adding an estimated $113M. The largest seller was Sands Capital Management, exiting entirely with an estimated $302M sold.
- 305 institutional investors held iRhythm Holdings (IRTC) as of Q1 2026, down from 333 in Q4 2025.
- Funds reported $4.19B of iRhythm Holdings stock for Q1 2026, down 33% quarter-over-quarter.
- 46 funds opened new iRhythm Holdings positions in Q1 2026 and 69 closed out, a net change of -23 holders.
- The largest iRhythm Holdings buyer in Q1 2026 was Millennium Management, an estimated $113M added.
- The largest iRhythm Holdings seller in Q1 2026 was Sands Capital Management, an estimated $302M sold.
Based on aggregated 13F filings for Q1 2026.