Irhythm HoldingsIRTC
13F holders, Q1 2026 (March 31)305holders −30
38new positions
68sold out
7famous investors
$118.07avg. 13F price*
At the end of Q1 2026, 305 institutions reported holding Irhythm Holdings Inc. (IRTC) in their 13F filings, down 30 from Q4 2025. 38 opened new positions and 68 sold out. The largest holders were BlackRock, Inc. ($323.6M), Vanguard Portfolio Management LLC ($212.0M) and RTW Investments, LP ($196.9M). 7 famous investors held it, including Israel Englander (0.1% of Millennium Management's portfolio), Steve Cohen (0.1% of Point72 Asset Management's portfolio) and Ron Baron (0.1% of Baron Capital (BAMCO)'s portfolio).
- Company
- Irhythm Holdings Inc.
- CUSIP
- 450056106
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 38 | $86.0M |
| Exits | 68 | $574.2M |
All 13F filers, Q4 2025 → Q1 2026: 6,721,378 shares bought and 6,502,354 shares sold, net +219,024 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 305 holders
| BlackRock, Inc. | 0.01% | Reduce -2.6% | 2,741,505 | $323.6M |
| Vanguard Portfolio Management LLC | 0.01% | — | 1,796,372 | $212.0M |
| RTW Investments, LP | 1.96% | Add +41.2% | 1,668,500 | $196.9M |
| Millennium Management | 0.15% | Add +94.6% | 1,608,014 | $189.8M |
| Artisan Partners Limited Partnership | 0.28% | Reduce -4.0% | 1,450,907 | $171.2M |
| Vanguard Capital Management LLC | 0.00% | — | 1,445,710 | $170.6M |
| FMR LLC | 0.01% | Add +116.6% | 1,361,919 | $160.7M |
| Holocene Advisors, LP | 0.36% | Add +82.7% | 1,248,658 | $147.4M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 0.03% | Add +26.2% | 1,047,452 | $123.6M |
| Geode Capital Management, LLC | 0.01% | Reduce -4.8% | 817,110 | $96.5M |
| State Street Corp. | 0.00% | Add +3.1% | 788,302 | $93.0M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 0.10% | Add +30.7% | 762,062 | $89.9M |
| Eventide Asset Management, LLC | 1.48% | Add +9.9% | 760,825 | $89.8M |
| JPMorgan Chase & Co. | 0.01% | Reduce -5.8% | 714,896 | $81.6M |
| Fuller & Thaler Asset Management, Inc. | 0.27% | Add +5.5% | 674,698 | $79.6M |
| Blair William & Co. | 0.21% | Reduce -12.6% | 628,385 | $74.2M |
| Braidwell LP | 2.74% | Add +180.8% | 610,192 | $72.0M |
| Point72 Asset Management | 0.13% | Add +173.1% | 599,405 | $70.7M |
| Arrowstreet Capital, Limited Partnership | 0.04% | Reduce -4.0% | 582,879 | $68.8M |
| Stephens Investment Management Group LLC | 0.91% | Add +8.1% | 561,530 | $66.3M |
| D. E. Shaw & Co. | 0.06% | Add +53.7% | 554,266 | $65.4M |
| Capital Research Global Investors | 0.01% | Reduce -57.0% | 509,590 | $60.1M |
| Allspring Global Investments Holdings, LLC | 0.09% | Add +14.7% | 467,113 | $55.2M |
| Bank of America Corp. | 0.00% | Add +21.9% | 432,539 | $51.0M |
| Polar Capital Holdings Plc | 0.22% | Add +36.8% | 421,612 | $49.8M |
| Manufacturers Life Insurance Company, The | 0.04% | Add +99.2% | 390,577 | $46.1M |
| Mackenzie Financial Corp. | 0.05% | Add +7.0% | 371,475 | $43.8M |
| Loomis Sayles & Co. L P | 0.06% | Reduce -6.2% | 367,894 | $43.4M |
| Goldman Sachs Group Inc. | 0.01% | Add +5.9% | 348,563 | $41.1M |
| Ophir Asset Management Pty Ltd | 4.62% | Add +163.0% | 335,807 | $39.6M |
| Invesco Ltd. | 0.00% | Reduce -40.3% | 297,452 | $35.1M |
| Northern Trust Corp. | 0.00% | Add +2.2% | 285,086 | $33.6M |
| Charles Schwab Investment Management Inc. | 0.01% | Reduce -1.5% | 281,897 | $33.3M |
| Fred Alger Management, LLC | 0.15% | Reduce -9.8% | 280,040 | $33.1M |
| Assenagon Asset Management S.A. | 0.05% | Add +20.0% | 270,221 | $31.9M |
| Rock Springs Capital Management LP | 1.82% | Add +11.4% | 261,750 | $30.9M |
| Schroder Investment Management Group | 0.02% | Add +52.9% | 247,746 | $28.3M |
| Morgan Stanley | 0.00% | Add +39.9% | 237,799 | $28.1M |
| Ameriprise Financial Inc. | 0.01% | Add +91.5% | 236,786 | $27.9M |
| Citigroup Inc. | 0.02% | Add +21.9% | 232,123 | $27.4M |
| Qube Research & Technologies Ltd | 0.04% | Add +56.9% | 226,884 | $26.8M |
| Vanguard Fiduciary Trust Co. | 0.01% | — | 223,699 | $26.4M |
| Deutsche Bank AG | 0.01% | Add +15.0% | 215,758 | $25.5M |
| Sei Investments Co. | 0.02% | Reduce -2.2% | 198,904 | $23.5M |
| Balyasny Asset Management L.P. | 0.05% | Add +16.2% | 194,429 | $22.9M |
| Barclays PLC | 0.01% | Reduce -2.9% | 188,345 | $22.2M |
| Baron Capital (BAMCO) | 0.07% | New | 183,900 | $21.7M |
| Next Century Growth Investors LLC | 1.45% | Reduce -2.0% | 169,306 | $20.0M |
| First Light Asset Management, LLC | 1.78% | Add +9.3% | 168,116 | $19.8M |
| Massachusetts Financial Services Co. | 0.01% | Add +10.9% | 166,637 | $19.7M |
| Oberweis Asset Management Inc./ | 0.54% | Add +30.3% | 156,004 | $18.4M |
| Federated Hermes, Inc. | 0.03% | Add +40.5% | 149,459 | $17.6M |
| Raymond James Financial Inc. | 0.01% | Reduce -5.7% | 145,123 | $16.7M |
| Jennison Associates LLC | 0.01% | Reduce -1.4% | 137,040 | $16.2M |
| Franklin Resources Inc. | 0.00% | Add +2.5% | 121,558 | $14.3M |
| Citadel Advisors | 0.01% | New | 113,600 | $13.4M |
| Jane Street Group, LLC | 0.01% | Reduce -41.3% | 112,864 | $13.3M |
| Nuveen, LLC | 0.00% | Reduce -16.4% | 111,732 | $13.2M |
| Trexquant Investment LP | 0.10% | Add +41.5% | 111,311 | $13.1M |
| Bank of New York Mellon Corp | 0.00% | Reduce -3.9% | 107,789 | $12.7M |
| Perceptive Advisors LLC | 0.25% | Reduce -2.8% | 105,026 | $12.4M |
| WCM Investment Management, LLC | 0.03% | Add +47.5% | 108,078 | $12.3M |
| New York State Common Retirement Fund | 0.02% | Reduce -20.9% | 102,594 | $12.1M |
| Segall Bryant & Hamill, LLC | 0.17% | Reduce -10.7% | 99,796 | $11.8M |
| Granahan Investment Management, LLC | 0.55% | Add +567.9% | 96,022 | $11.3M |
| UBS Group AG | 0.00% | Reduce -40.0% | 91,903 | $10.8M |
| TimesSquare Capital Management, LLC | 0.18% | Add +51.5% | 90,652 | $10.7M |
| Wellington Management Group LLP | 0.00% | Reduce -77.8% | 90,460 | $10.7M |
| Man Group plc | 0.02% | Add +57.0% | 88,210 | $10.4M |
| Schonfeld Strategic Advisors LLC | 0.09% | Add +682.9% | 88,133 | $10.4M |
| M&G PLC | 0.05% | Add +1.1% | 85,062 | $10.0M |
| C WorldWide Group Holding A/S | 0.20% | No change | 80,000 | $9.4M |
| Susquehanna Portfolio Strategies, LLC | 0.13% | New | 75,961 | $9.0M |
| Thrivent Financial for Lutherans | 0.02% | New | 75,162 | $8.9M |
| Frontier Capital Management Co. LLC | 0.08% | Reduce -3.6% | 68,454 | $8.1M |
| Peregrine Capital Management LLC | 0.29% | Add +15.8% | 65,875 | $7.8M |
| Swiss National Bank | 0.00% | Add +0.5% | 63,700 | $7.5M |
| Silvercrest Asset Management Group LLC | 0.05% | Add +28.8% | 61,681 | $7.3M |
| Canada Pension Plan Investment Board | 0.00% | Add +95.3% | 58,800 | $6.9M |
| Alliancebernstein L.P. | 0.00% | Reduce -3.2% | 36,299 | $6.4M |
| Renaissance Technologies | 0.01% | Reduce -48.2% | 53,800 | $6.3M |
| Principal Financial Group Inc. | 0.00% | Reduce -23.0% | 53,476 | $6.3M |
| Atle Fund Management AB | 2.02% | Reduce -40.6% | 22,322 | $6.3M |
| Two Sigma Investments, LP | 0.01% | New | 52,600 | $6.2M |
| Legal & General Group Plc | 0.00% | Reduce -1.0% | 51,569 | $6.1M |
| Amundi | 0.00% | Add +48.4% | 49,575 | $5.9M |
| Engineers Gate Manager LP | 0.07% | Reduce -36.1% | 49,269 | $5.8M |
| State of Wisconsin Investment Board | 0.01% | Reduce -6.1% | 48,050 | $5.7M |
| First Trust Advisors LP | 0.00% | Reduce -21.7% | 47,589 | $5.6M |
| Jump Financial, LLC | 0.09% | Add +119.1% | 44,984 | $5.3M |
| Connor, Clark & Lunn Investment Management Ltd. | 0.01% | Add +0.5% | 42,346 | $5.0M |
| Campbell & CO Investment Adviser LLC | 0.27% | New | 40,818 | $4.8M |
| Parkman Healthcare Partners LLC | 0.49% | New | 40,125 | $4.7M |
| Rhumbline Advisers | 0.00% | Reduce -2.9% | 39,422 | $4.7M |
| California State Teachers Retirement System | 0.00% | Add +22.1% | 37,324 | $4.4M |
| T. Rowe Price Associates Inc. | 0.00% | Reduce -92.9% | 35,687 | $4.2M |
| Hillsdale Investment Management Inc. | 0.11% | Add +2.6% | 34,950 | $4.1M |
| Sirios Capital Management L P | 0.50% | New | 34,744 | $4.1M |
| AQR Capital Management | 0.00% | Reduce -13.9% | 34,590 | $4.1M |
| Verition Fund Management LLC | 0.04% | Add +76.3% | 34,565 | $4.1M |
"% of holder's portfolio" is IRTC's weight in each manager's 13F, not the share of Irhythm Holdings Inc. the manager owns.