DaveManuel.com · Institutional Ownership · Who Owns It
IRHYTHM HOLDINGS INC (IRTC)
Institutional ownership reported to the SEC as of Q2 2026, across 32 quarters.
308
Reporting holders
$4.3B
Reported value
108.2%
Of shares outstanding
0.2%
Calls
0.2%
Puts
+0
Holder change
Institutions report 35,652,873 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.
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
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 incl. $1.2M options CALL+PUT | 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 incl. $3.3M options CALL+PUT | 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 |
| AMERIPRISE FINANCIAL INC | $34.8M | 292,513 | 0.01% | 31q | +23.5%+$6.6M |
| 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 incl. $4.9M options CALL+PUT | 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 |
| 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 |
| C WorldWide Group Holding A/S | $9.5M | 80,000 | 0.23% | 23q | HELD |
| 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 |
| Verition Fund Management LLC | $6.7M | 55,987 | 0.03% | 6q | +62.0%+$2.5M |
| Atle Fund Management AB | $6.4M | 54,102 | 1.73% | 6q | +142.4%+$3.8M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $6.3M incl. $4.2M options CALL+PUT | 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 | +78.1%+$2.5M |
| 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 |
| PRICE T ROWE ASSOCIATES INC /MD/ | $5.3M | 44,239 | 0.00% | 31q | +24.0%+$1.0M |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | $5.2M | 44,067 | 0.00% | 31q | +18.1%+$802.1K |
| 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 |
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 |
|---|---|---|---|
| 2026-10-13 | 13G/A | Millennium Management LLCwith 2 co-filers | 1.1% |
What the company announced
Form 8-K filings from the last 120 days, showing only the items worth a reader's attention. Earnings releases, exhibit attachments and general disclosures are filed constantly and are left out. Filed is when the SEC received it; event is the date the company says the thing happened.
| Filed | Event date | What | Source |
|---|---|---|---|
| 2026-08-13 | 2026-08-11 | Directors or officers departed or appointed | filing |
| 2026-08-06 | 2026-08-05 | Material agreement entered | filing |
| 2026-08-06 | 2026-07-31 | Material agreement entered | filing |
What the insiders did
Open market purchases and sales reported on Form 4 in the last 180 days. Grants, option exercises and shares surrendered to cover tax are left out: they are compensation rather than a decision to buy or sell. Where a broker filled one order in tranches the lines are summed, because it was one decision.
Officers and directors
| Date | Insider | Role | Side | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-10 | Blackford Quentin S. | President and CEO | Sold | 26,859 | $3.3M |
| 2026-08-10 | Patterson Chad | CHIEF COMM & PRODUCT OFFICER | Sold | 7,093 | $884.2K |
| 2026-08-10 | Murphy Patrick Michael | CBO and CLO | Sold | 7,093 | $884.2K |
| 2026-08-10 | Turakhia Minang | CHIEF MED/SCI OFCR EVP ADVTECH | Sold | 7,093 | $884.2K |
| 2026-08-10 | Shrishrimal Sumi | EVP, Chief Risk Officer | Sold | 5,372 | $669.6K |
| 2026-05-11 | TALWALKAR ABHIJIT Y | Director | Sold | 5,312 | $626.4K ×5 |
| 2026-08-03 | Patterson Chad | CHIEF COMM & PRODUCT OFFICER | Sold | 2,712 | $331.2K |
| 2026-08-03 | Rodda Julianne | EVP, CHIEF PEOPLE OFFICER | Sold | 2,112 | $257.9K |
| 2026-06-02 | Shrishrimal Sumi | EVP, Chief Risk Officer | Sold | 1,716 | $185.7K |
| 2026-07-02 | Turakhia Minang | CHIEF MED/SCI OFCR EVP ADVTECH | Sold | 1,423 | $177.5K |
| 2026-07-02 | Freeman Sean Clinton | EVP, Strategy & Corp Devt | Sold | 918 | $114.5K |
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 |
|---|---|---|---|---|---|---|---|
| Q3 2026 | 66 | $23.0M | 201,819 | 12 | 17 | 14 | 0.4% |
| Q2 2026 | 308 | $4.3B | 35,652,873 | 40 | 121 | 89 | 0.4% |
| Q1 2026 | 308 | $4.2B | 35,530,027 | 39 | 109 | 104 | 0.5% |
| Q4 2025 | 340 | $6.4B | 35,846,530 | 33 | 104 | 120 | 0.4% |
| Q3 2025 | 342 | $6.1B | 35,145,176 | 61 | 104 | 114 | 1.1% |
| Q2 2025 | 308 | $5.5B | 35,468,652 | 68 | 97 | 93 | 1.2% |
| Q1 2025 | 260 | $3.8B | 35,991,795 | 51 | 74 | 79 | 1.0% |
| Q4 2024 | 234 | $3.3B | 37,092,349 | 29 | 70 | 83 | 1.1% |
| Q3 2024 | 245 | $2.7B | 35,241,393 | 48 | 85 | 67 | 3.9% |
| Q2 2024 | 231 | $4.0B | 36,509,546 | 25 | 103 | 64 | 1.3% |
| Q1 2024 | 257 | $4.2B | 36,077,719 | 51 | 75 | 89 | 1.3% |
| Q4 2023 | 226 | $3.8B | 34,617,157 | 27 | 83 | 65 | 1.4% |
| Q3 2023 | 230 | $3.2B | 33,367,955 | 37 | 70 | 75 | 2.3% |
| Q2 2023 | 206 | $3.6B | 33,556,059 | 26 | 68 | 78 | 2.4% |
| Q1 2023 | 213 | $4.6B | 36,163,553 | 35 | 78 | 60 | 1.8% |
| Q4 2022 | 211 | $3.0B | 31,275,299 | 25 | 60 | 84 | 1.7% |
| Q3 2022 | 226 | $4.8B | 37,790,069 | 30 | 84 | 74 | 1.8% |
| Q2 2022 | 233 | $4.1B | 37,039,890 | 47 | 54 | 92 | 1.3% |
| Q1 2022 | 219 | $10.2B | 64,228,162 | 41 | 71 | 75 | 0.5% |
| Q4 2021 | 209 | $13.2B | 111,255,848 | 45 | 60 | 70 | 0.7% |
| Q3 2021 | 180 | $8.9B | 151,426,452 | 34 | 47 | 61 | 0.6% |
| Q2 2021 | 178 | $2.2B | 32,130,839 | 26 | 73 | 51 | 2.7% |
| Q1 2021 | 212 | $6.3B | 45,083,342 | 44 | 59 | 75 | 0.8% |
| Q4 2020 | 242 | $12.0B | 50,150,139 | 35 | 94 | 69 | 1.2% |
| Q3 2020 | 235 | $9.4B | 39,129,243 | 65 | 52 | 94 | 0.9% |
| Q2 2020 | 192 | $4.6B | 39,103,993 | 48 | 57 | 60 | 1.0% |
| Q1 2020 | 167 | $4.5B | 55,185,174 | 25 | 71 | 44 | 0.3% |
| Q4 2019 | 169 | $2.8B | 41,235,629 | 21 | 59 | 57 | 0.6% |
| Q3 2019 | 166 | $2.9B | 39,376,738 | 15 | 65 | 54 | 0.6% |
| Q2 2019 | 171 | $3.1B | 38,377,992 | 27 | 79 | 43 | 1.3% |
| Q1 2019 | 178 | $2.9B | 38,609,082 | 42 | 66 | 56 | 1.4% |
| Q4 2018 | 159 | $2.4B | 34,286,482 | 4 | 4 | 2 | 0.8% |