IRHYTHM HOLDINGS INC (IRTC)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
290
Reporting holders
$4.3B
Reported value
108.5%
Of shares outstanding
0.4%
Held as options
+6
Holder change
Institutions report 35,758,400 shares against 32,963,003 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Over 100% because an adviser and a sub-adviser can both report the same shares, and both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| BlackRock, Inc. | $355.1M | 2,985,667 | 0.01% | 8q | +8.9%+$29.0M |
| RTW INVESTMENTS, LP | $259.6M | 2,182,631 | 2.22% | 3q | +30.8%+$61.2M |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $227.7M | 1,913,976 | 0.01% | 2q | +6.5%+$14.0M |
| Artisan Partners Limited Partnership | $197.5M | 1,660,307 | 0.31% | 19q | +14.4%+$24.9M |
| VANGUARD CAPITAL MANAGEMENT LLC | $174.0M | 1,463,211 | 0.00% | 2q | +1.2%+$2.1M |
| MILLENNIUM MANAGEMENT LLC | $167.3M | 1,406,454 | 0.06% | 17q | -12.5%-$24.0M |
| FMR LLC | $141.8M | 1,191,982 | 0.01% | 31q | -12.5%-$20.2M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $112.4M | 944,517 | 0.02% | 31q | -9.8%-$12.2M |
| GEODE CAPITAL MANAGEMENT, LLC | $104.9M | 881,899 | 0.01% | 31q | +7.9%+$7.7M |
| EVENTIDE ASSET MANAGEMENT, LLC | $104.7M | 880,338 | 1.40% | 17q | +15.7%+$14.2M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $103.1M | 866,528 | 0.10% | 31q | +13.7%+$12.4M |
| STATE STREET CORP | $101.9M | 856,517 | 0.00% | 31q | +8.7%+$8.1M |
| Holocene Advisors, LP | $93.2M | 783,636 | 0.21% | 28q | -37.2%-$55.3M |
| JPMORGAN CHASE & CO | $90.9M | 766,216 | 0.01% | 31q | +7.2%+$6.1M |
| Stephens Investment Management Group LLC | $82.5M | 693,437 | 0.88% | 23q | +23.5%+$15.7M |
| FULLER & THALER ASSET MANAGEMENT, INC. | $81.5M | 685,496 | 0.22% | 6q | +1.6%+$1.3M |
| BRAIDWELL LP | $77.8M | 654,262 | 2.88% | 15q | +7.2%+$5.2M |
| D. E. Shaw & Co., Inc. | $76.1M | 629,686 | 0.04% | 5q | +13.6%+$9.1M |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | $66.8M | 561,251 | 0.05% | 31q | +43.7%+$20.3M |
| BLAIR WILLIAM & CO/IL | $62.4M | 524,690 | 0.16% | 27q | -16.5%-$12.3M |
| BANK OF AMERICA CORP /DE/ | $55.4M | 465,719 | 0.00% | 31q | +7.7%+$3.9M |
| Polar Capital Holdings Plc | $54.5M | 458,089 | 0.13% | 18q | +8.7%+$4.3M |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | $53.6M | 450,865 | 0.02% | 5q | -22.6%-$15.7M |
| SCHRODER INVESTMENT MANAGEMENT GROUP | $53.1M | 448,259 | 0.04% | 10q | +80.9%+$23.7M |
| GOLDMAN SACHS GROUP INC | $43.1M | 362,346 | 0.00% | 31q | +4.0%+$1.6M |
| LOOMIS SAYLES & CO L P | $41.4M | 347,959 | 0.05% | 5q | -5.4%-$2.4M |
| Capital Research Global Investors | $39.9M | 335,209 | 0.01% | 31q | -34.2%-$20.7M |
| Allspring Global Investments Holdings, LLC | $37.4M | 300,057 | 0.06% | 19q | -35.8%-$20.8M |
| NORTHERN TRUST CORP | $36.6M | 307,995 | 0.00% | 31q | +8.0%+$2.7M |
| JANE STREET GROUP, LLC | $36.0M | 275,262 | 0.00% | 26q | +143.9%+$21.2M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $35.5M | 298,301 | 0.00% | 31q | +5.8%+$2.0M |
| Sixth Street Partners Management Company, L.P. | $35.5M | 298,301 | 0.00% | new | NEW |
| AMERIPRISE FINANCIAL INC | $34.8M | 292,513 | 0.01% | 31q | -38.2%-$21.5M |
| WESTFIELD CAPITAL MANAGEMENT CO LP | $34.4M | 288,924 | 0.11% | new | NEW |
| Point72 Asset Management, L.P. | $32.5M | 273,162 | 0.04% | 6q | -54.4%-$38.8M |
| Qube Research & Technologies Ltd | $32.3M | 271,624 | 0.03% | 5q | +19.7%+$5.3M |
| Rock Springs Capital Management LP | $32.1M | 269,650 | 1.57% | 31q | +3.0%+$939.7K |
| CITIGROUP INC | $29.7M | 249,404 | 0.01% | 31q | +7.4%+$2.1M |
| DEUTSCHE BANK AG\ | $28.3M | 238,193 | 0.01% | 34q | +10.4%+$2.7M |
| VANGUARD FIDUCIARY TRUST CO | $28.1M | 235,963 | 0.01% | 2q | +5.5%+$1.5M |
| PERCEPTIVE ADVISORS LLC | $26.6M | 223,766 | 0.40% | 4q | +113.1%+$14.1M |
| FRED ALGER MANAGEMENT, LLC | $26.3M | 220,789 | 0.09% | 12q | -21.2%-$7.0M |
| OBERWEIS ASSET MANAGEMENT INC/ | $24.0M | 202,004 | 0.50% | 5q | +29.5%+$5.5M |
| Ophir Asset Management Pty Ltd | $24.0M | 201,491 | 1.97% | 7q | -40.0%-$16.0M |
| BARCLAYS PLC | $22.8M | 191,798 | 0.00% | 18q | +1.8%+$410.7K |
| NEXT CENTURY GROWTH INVESTORS LLC | $22.3M | 187,064 | 1.18% | 6q | +10.5%+$2.1M |
| BAMCO INC /NY/ | $21.6M | 181,430 | 0.03% | 2q | -1.3%-$293.8K |
| SEI INVESTMENTS CO | $21.3M | 178,765 | 0.02% | 31q | -10.1%-$2.4M |
| First Light Asset Management, LLC | $19.9M | 167,092 | 1.21% | 7q | -0.6%-$121.8K |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ | $19.7M | 165,998 | 0.01% | 5q | HELD |
| Prosight Management, LP | $19.7M | 165,500 | 3.39% | 2q | +1555.0%+$18.5M |
| Schonfeld Strategic Advisors LLC | $18.1M | 152,062 | 0.06% | 7q | +72.5%+$7.6M |
| NORGES BANK | $17.6M | 148,072 | 0.00% | 2q | +163.3%+$10.9M |
| MORGAN STANLEY | $17.6M | 147,998 | 0.00% | 35q | -37.8%-$10.7M |
| TimesSquare Capital Management, LLC | $16.3M | 137,311 | 0.24% | 5q | +51.5%+$5.6M |
| CITADEL ADVISORS LLC | $16.3M | 95,931 | 0.00% | 31q | -15.6%-$3.0M |
| RAYMOND JAMES FINANCIAL INC | $16.1M | 135,265 | 0.00% | 7q | -6.8%-$1.2M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | $15.8M | 132,475 | 0.15% | 8q | +93.5%+$7.6M |
| Bank of New York Mellon Corp | $14.1M | 118,768 | 0.00% | 31q | +10.2%+$1.3M |
| Nuveen, LLC | $13.6M | 113,918 | 0.00% | 6q | +2.0%+$260.0K |
| Verition Fund Management LLC | $13.3M | 111,974 | 0.03% | 6q | +224.0%+$9.2M |
| SEGALL BRYANT & HAMILL, LLC | $12.8M | 107,467 | 0.15% | 10q | +7.7%+$912.5K |
| USS Investment Management Ltd | $12.7M | 106,957 | 0.05% | new | NEW |
| WCM INVESTMENT MANAGEMENT, LLC | $12.7M | 107,000 | 0.02% | 12q | -1.0%-$127.7K |
| Champlain Investment Partners, LLC | $11.5M | 97,015 | 0.30% | new | NEW |
| Trexquant Investment LP | $11.5M | 96,268 | 0.07% | 6q | -13.5%-$1.8M |
| FEDERATED HERMES, INC. | $11.4M | 95,871 | 0.02% | 5q | -35.9%-$6.4M |
| NEW YORK STATE COMMON RETIREMENT FUND | $11.1M | 92,993 | 0.01% | 31q | -9.4%-$1.1M |
| Integral Health Asset Management, LLC | $10.7M | 90,000 | 0.42% | new | NEW |
| WELLINGTON MANAGEMENT GROUP LLP | $10.5M | 88,257 | 0.00% | 12q | -2.4%-$262.0K |
| SILVERCREST ASSET MANAGEMENT GROUP LLC | $10.2M | 85,830 | 0.07% | 12q | +39.2%+$2.9M |
| Granahan Investment Management, LLC | $10.0M | 83,903 | 0.36% | 8q | -12.6%-$1.4M |
| UBS Group AG | $9.2M | 77,665 | 0.00% | 31q | -15.5%-$1.7M |
| PEREGRINE CAPITAL MANAGEMENT LLC | $9.0M | 75,724 | 0.29% | 17q | +15.0%+$1.2M |
| Squarepoint Ops LLC | $8.5M | 71,862 | 0.01% | 12q | +1065.8%+$7.8M |
| JENNISON ASSOCIATES LLC | $8.1M | 67,924 | 0.00% | 6q | -50.4%-$8.2M |
| Parkman Healthcare Partners LLC | $8.0M | 67,267 | 0.82% | 2q | +67.6%+$3.2M |
| Legal & General Group Plc | $7.8M | 65,304 | 0.00% | 31q | +26.6%+$1.6M |
| PFM Health Sciences, LP | $7.8M | 65,196 | 0.67% | new | NEW |
| Swiss National Bank | $7.7M | 64,800 | 0.00% | 31q | +1.7%+$130.8K |
| NEUBERGER BERMAN GROUP LLC | $7.5M | 63,343 | 0.01% | 5q | +3342.6%+$7.3M |
| PRINCIPAL FINANCIAL GROUP INC | $7.1M | 59,733 | 0.00% | 31q | +11.7%+$744.3K |
| Amundi | $6.7M | 56,534 | 0.00% | 21q | +14.0%+$827.8K |
| Atle Fund Management AB | $6.4M | 54,102 | 1.73% | 6q | +142.4%+$3.8M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6.3M | 18,015 | 0.00% | 31q | -25.4%-$2.2M |
| Susquehanna Portfolio Strategies, LLC | $5.8M | 49,120 | 0.09% | 2q | -35.3%-$3.2M |
| CANADA PENSION PLAN INVESTMENT BOARD | $5.8M | 48,700 | 0.00% | 6q | -17.2%-$1.2M |
| WELLS FARGO & COMPANY/MN | $5.7M | 47,903 | 0.00% | 31q | -11.0%-$701.0K |
| STATE OF WISCONSIN INVESTMENT BOARD | $5.3M | 44,699 | 0.01% | 29q | -7.0%-$398.6K |
| Assenagon Asset Management S.A. | $5.3M | 44,322 | 0.00% | 4q | -83.6%-$26.9M |
| Man Group plc | $5.2M | 43,362 | 0.01% | 5q | -50.8%-$5.3M |
| Connor, Clark & Lunn Investment Management Ltd. | $5.0M | 42,314 | 0.01% | 5q | HELD |
| ALLIANCEBERNSTEIN L.P. | $5.0M | 42,595 | 0.00% | 31q | +17.3%+$743.1K |
| RHUMBLINE ADVISERS | $5.0M | 42,028 | 0.00% | 31q | +6.6%+$310.0K |
| RENAISSANCE TECHNOLOGIES LLC | $4.6M | 38,500 | 0.01% | 6q | -28.4%-$1.8M |
| SIRIOS CAPITAL MANAGEMENT L P | $4.1M | 34,455 | 0.50% | 2q | -0.8%-$34.4K |
| Engineers Gate Manager LP | $3.6M | 30,418 | 0.05% | 8q | -38.3%-$2.2M |
| VANGUARD ASSET MANAGEMENT, Ltd | $3.6M | 30,320 | 0.00% | 2q | +5.8%+$199.2K |
| EFG International AG | $3.4M | 28,913 | 0.06% | 3q | -1.9%-$65.1K |
| SECTORAL ASSET MANAGEMENT INC | $3.1M | 26,070 | 2.16% | new | NEW |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | RTW Investments, LPwith 1 co-filers | 6.6% |
| 2026-08-13 | 13G | Artisan Partners Asset Management Inc.with 3 co-filers | 5.1% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 290 | $4.3B | 35,758,400 | 43 | 107 | 88 | 0.4% |
| Q1 2026 | 284 | $4.2B | 35,573,598 | 34 | 106 | 97 | 0.5% |
| Q4 2025 | 317 | $6.1B | 34,084,427 | 32 | 95 | 116 | 0.4% |
| Q3 2025 | 317 | $5.8B | 33,494,303 | 54 | 99 | 104 | 1.2% |
| Q2 2025 | 288 | $5.3B | 33,757,667 | 65 | 91 | 88 | 1.2% |
| Q1 2025 | 242 | $3.6B | 34,088,496 | 49 | 67 | 75 | 1.0% |
| Q4 2024 | 218 | $3.1B | 35,412,283 | 28 | 63 | 77 | 1.1% |
| Q3 2024 | 228 | $2.6B | 33,905,600 | 46 | 80 | 63 | 3.9% |
| Q2 2024 | 211 | $3.8B | 34,938,508 | 22 | 94 | 58 | 1.3% |
| Q1 2024 | 234 | $4.0B | 34,092,549 | 45 | 70 | 78 | 1.3% |
| Q4 2023 | 205 | $3.6B | 32,831,374 | 25 | 74 | 59 | 1.4% |
| Q3 2023 | 205 | $3.0B | 31,367,005 | 32 | 64 | 65 | 2.4% |
| Q2 2023 | 183 | $3.3B | 30,466,112 | 24 | 58 | 71 | 2.5% |
| Q1 2023 | 185 | $4.3B | 34,078,280 | 31 | 66 | 54 | 1.3% |
| Q4 2022 | 166 | $2.3B | 24,629,867 | 22 | 53 | 57 | 1.8% |
| Q3 2022 | 236 | $4.0B | 30,948,084 | 31 | 88 | 78 | 2.2% |
| Q2 2022 | 239 | $3.3B | 30,436,494 | 47 | 57 | 94 | 1.5% |
| Q1 2022 | 225 | $4.9B | 30,480,639 | 41 | 75 | 76 | 1.1% |
| Q4 2021 | 213 | $3.5B | 29,156,347 | 45 | 61 | 71 | 2.5% |
| Q3 2021 | 184 | $1.7B | 28,055,741 | 34 | 48 | 62 | 3.2% |
| Q2 2021 | 182 | $2.0B | 29,086,513 | 27 | 73 | 53 | 3.0% |
| Q1 2021 | 216 | $4.4B | 31,208,946 | 45 | 61 | 76 | 1.2% |
| Q4 2020 | 245 | $8.8B | 36,476,649 | 35 | 95 | 70 | 1.6% |
| Q3 2020 | 238 | $7.5B | 31,323,677 | 65 | 53 | 96 | 1.1% |
| Q2 2020 | 195 | $3.6B | 30,930,199 | 48 | 59 | 61 | 1.2% |
| Q1 2020 | 169 | $2.7B | 32,658,855 | 25 | 72 | 45 | 0.5% |
| Q4 2019 | 172 | $2.3B | 33,152,784 | 21 | 61 | 57 | 0.7% |
| Q3 2019 | 169 | $2.3B | 31,381,208 | 15 | 67 | 54 | 0.8% |
| Q2 2019 | 174 | $2.4B | 30,494,914 | 27 | 80 | 43 | 1.7% |
| Q1 2019 | 181 | $2.1B | 27,607,037 | 42 | 68 | 56 | 2.0% |
| Q4 2018 | 162 | $1.8B | 25,883,288 | 4 | 4 | 2 | 1.1% |