IRHYTHM TECHNOLOGIES INC IRTC
COM · Common Stock · CUSIP 450056106 · ISIN US4500561067
- SectorHealth care
- IndustrySurgical & Medical Instruments & Apparatus
- HeadquartersSan Francisco, CA
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.0m this quarter). Holder counts are more reliable. Shares outstanding: 33.0m as of 2026-07-30, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $118.98. Options: 7 managers hold calls ($7.3m notional), 7 hold puts ($7.9m).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 233 |
| Q4 2022 | 208 |
| Q1 2023 | 209 |
| Q2 2023 | 204 |
| Q3 2023 | 225 |
| Q4 2023 | 223 |
| Q1 2024 | 254 |
| Q2 2024 | 229 |
| Q3 2024 | 243 |
| Q4 2024 | 228 |
| Q1 2025 | 257 |
| Q2 2025 | 306 |
| Q3 2025 | 337 |
| Q4 2025 | 335 |
| Q1 2026 | 305 |
| Q2 2026 | 305 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2024 | 131 | 100 |
| Q4 2024 | 99 | 134 |
| Q1 2025 | 133 | 102 |
| Q2 2025 | 167 | 116 |
| Q3 2025 | 171 | 142 |
| Q4 2025 | 141 | 163 |
| Q1 2026 | 149 | 174 |
| Q2 2026 | 161 | 131 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $24.5m | $44.1m | 1.80 |
| Q4 2025 | $7.0m | $19.7m | 2.81 |
| Q1 2026 | $12.0m | $9.0m | 0.75 |
| Q2 2026 | $7.3m | $7.9m | 1.08 |
Biggest buyers
| RTW INVESTMENTS, LP | Added | +514.1k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | New | +288.9k |
| BlackRock, Inc. | Added | +244.2k |
| Artisan Partners Limited Partnership | Added | +209.4k |
| SCHRODER INVESTMENT MANAGEMENT GROUP | Added | +200.5k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE | Added | +170.7k |
| JANE STREET GROUP, LLC | Added | +162.4k |
| Prosight Management, LP | Added | +155.5k |
| Stephens Investment Management Group LLC | Added | +131.9k |
| EVENTIDE ASSET MANAGEMENT, LLC | Added | +119.5k |
Biggest sellers
| Holocene Advisors, LP | Reduced | -465.0k |
| MACKENZIE FINANCIAL CORP | Sold out | -371.5k |
| Point72 Asset Management, L.P. | Reduced | -326.2k |
| Invesco Ltd. | Reduced | -275.3k |
| Assenagon Asset Management S.A. | Reduced | -225.9k |
| MILLENNIUM MANAGEMENT LLC | Reduced | -201.6k |
| Balyasny Asset Management L.P. | Reduced | -188.9k |
| Capital Research Global Investors | Reduced | -174.4k |
| FMR LLC | Reduced | -169.9k |
| Allspring Global Investments Holdings, LLC | Reduced | -167.1k |
Biggest calls
| JANE STREET GROUP, LLC | Added | $2.4m20.3k shares |
| CITADEL ADVISORS LLC | Added | $2.0m16.8k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $1.3m11.2k shares |
| D. E. Shaw & Co., Inc. | New | $701.8k5.9k shares |
| IMC-Chicago, LLC | Added | $689.9k5.8k shares |
| Walleye Capital LLC | New | $119.0k1.0k shares |
| Raiffeisen Bank International AG | Unchanged | $80.9k680 shares |
Biggest puts
| CITADEL ADVISORS LLC | Added | $2.9m24.5k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $2.9m24.1k shares |
| JANE STREET GROUP, LLC | Reduced | $856.4k7.2k shares |
| IMC-Chicago, LLC | Added | $654.2k5.5k shares |
| D. E. Shaw & Co., Inc. | Reduced | $475.8k4.0k shares |
| Walleye Capital LLC | New | $119.0k1.0k shares |
| SIMPLEX TRADING, LLC | Reduced | $11.9k100 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| RTW INVESTMENTS, LP 13G · institution +1.4 pts · filed 2026-08-14 | 6.6% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-28 | 5.6% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-04-27 | 5.2% |
| Artisan Partners Limited Partnership 13G · institution +0.4 pts · filed 2026-08-13 | 5.1% |
Fell to 5% or below in the last year: MILLENNIUM MANAGEMENT LLC (1.1%, 2026-10-13), SANDS CAPITAL MANAGEMENT, LLC (0.0%, 2026-05-08), VANGUARD GROUP INC (0.0%, 2026-03-26; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 1 | $500.9k | 2 | $1.5m | — |
| Q1 2025 | 0 | — | 8 | $10.1m | — |
| Q2 2025 | 0 | — | 4 | $2.2m | $644.9k |
| Q3 2025 | 0 | — | 8 | $8.0m | $7.1m |
| Q4 2025 | 0 | — | 5 | $5.7m | $2.6m |
| Q1 2026 | 0 | — | 9 | $15.2m | $1.2m |
| Q2 2026 | 1 | — | 4 | $1.0m | $626.4k |
| Q3 2026 | 0 | — | 9 | $6.0m | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2026-09-02 | Wilson Daniel G. Chief Financial Officer | Sold | $94.2k773 shares |
| 2026-08-10 | Blackford Quentin S. President and CEO, director | Sold | $3.3m26.9k shares |
| 2026-08-10 | Patterson Chad CHIEF COMM & PRODUCT OFFICER | Sold | $884.1k7.1k shares |
| 2026-08-10 | Murphy Patrick Michael CBO and CLO | Sold | $884.1k7.1k shares |
| 2026-08-10 | Turakhia Minang CHIEF MED/SCI OFCR EVP ADVTECH | Sold | $884.1k7.1k shares |
| 2026-08-10 | Shrishrimal Sumi EVP, Chief Risk Officer | Sold | $669.6k5.4k shares |
| 2026-08-03 | Patterson Chad CHIEF COMM & PRODUCT OFFICER | Sold | $331.2k2.7k shares |
| 2026-08-03 | Rodda Julianne EVP, CHIEF PEOPLE OFFICER | Sold | $257.9k2.1k shares |
| 2026-08-03 | Smith Mervin EVP Strategic Business Ops | Sold | $75.3k617 shares |
| 2026-07-02 | Turakhia Minang CHIEF MED/SCI OFCR EVP ADVTECH | Sold | $177.5k1.4k shares |
| 2026-07-02 | Freeman Sean Clinton EVP, Strategy & Corp Devt | Sold | $114.5k918 shares |
| 2026-06-02 | Shrishrimal Sumi EVP, Chief Risk Officer | Sold | $185.7k1.7k shares |
| 2026-06-02 | Rosenbaum Marc Wade Chief Accounting Officer | Sold | $78.9k729 shares |
| 2026-05-11 | TALWALKAR ABHIJIT Y Director | Sold plan | $626.4k5.3k shares |
| 2026-05-11 | TALWALKAR ABHIJIT Y Director | Bought plan | —5.3k shares |
| 2026-05-04 | Lawrence Brian Lee Chief Technology Officer | Sold | $122.5k1.0k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| BlackRock, Inc. 0.01% of their portfolio | 3.0m $355.1m | Added +244.2k |
| RTW INVESTMENTS, LP 2.22% of their portfolio | 2.2m $259.6m | Added +514.1k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.01% of their portfolio | 1.9m $227.7m | Added +117.6k |
| Artisan Partners Limited Partnership 0.32% of their portfolio | 1.7m $197.5m | Added +209.4k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.5m $174.0m | Added +17.5k |
| MILLENNIUM MANAGEMENT LLC 0.11% of their portfolio | 1.4m $167.3m | Reduced -201.6k |
| FMR LLC 0.01% of their portfolio | 1.2m $141.8m | Reduced -169.9k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio | 944.5k $112.4m | Reduced -102.9k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 881.9k $104.9m | Added +64.8k |
| EVENTIDE ASSET MANAGEMENT, LLC 1.40% of their portfolio | 880.3k $104.7m | Added +119.5k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.10% of their portfolio | 866.5k $103.1m | Added +104.5k |
| STATE STREET CORP 0.00% of their portfolio | 856.5k $101.9m | Added +68.2k |
| Holocene Advisors, LP 0.21% of their portfolio | 783.6k $93.2m | Reduced -465.0k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 766.2k $90.9m | Added +51.3k |
| Stephens Investment Management Group LLC 0.88% of their portfolio | 693.4k $82.5m | Added +131.9k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.22% of their portfolio | 685.5k $81.5m | Added +10.8k |
| BRAIDWELL LP 2.88% of their portfolio | 654.3k $77.8m | Added +44.1k |
| D. E. Shaw & Co., Inc. 0.05% of their portfolio | 629.7k $74.9m | Added +75.4k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.05% of their portfolio | 561.3k $66.8m | Added +170.7k |
| BLAIR WILLIAM & CO/IL 0.16% of their portfolio | 524.7k $62.4m | Reduced -103.7k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 465.7k $55.4m | Added +33.2k |
| Polar Capital Holdings Plc 0.15% of their portfolio | 458.1k $54.5m | Added +36.5k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 0.02% of their portfolio | 450.9k $53.6m | Reduced -132.0k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.04% of their portfolio | 448.3k $53.1m | Added +200.5k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 362.3k $43.1m | Added +13.8k |
| LOOMIS SAYLES & CO L P 0.05% of their portfolio | 348.0k $41.4m | Reduced -19.9k |
| Capital Research Global Investors 0.01% of their portfolio | 335.2k $39.9m | Reduced -174.4k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 308.0k $36.6m | Added +22.9k |
| Allspring Global Investments Holdings, LLC 0.06% of their portfolio | 300.1k $37.4m | Reduced -167.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 298.3k $35.5m | Added +16.4k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 292.5k $34.8m | Added +55.7k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.11% of their portfolio | 288.9k $34.4m | New |
| JANE STREET GROUP, LLC 0.02% of their portfolio | 275.3k $32.7m | Added +162.4k |
| Point72 Asset Management, L.P. 0.05% of their portfolio | 273.2k $32.5m | Reduced -326.2k |
| Qube Research & Technologies Ltd 0.04% of their portfolio | 271.6k $32.3m | Added +44.7k |
| Rock Springs Capital Management LP 1.57% of their portfolio | 269.6k $32.1m | Added +7.9k |
| CITIGROUP INC 0.01% of their portfolio | 249.4k $29.7m | Added +17.3k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 238.2k $28.3m | Added +22.4k |
| VANGUARD FIDUCIARY TRUST CO 0.01% of their portfolio | 236.0k $28.1m | Added +12.3k |
| PERCEPTIVE ADVISORS LLC 0.41% of their portfolio | 223.8k $26.6m | Added +118.7k |
| FRED ALGER MANAGEMENT, LLC 0.09% of their portfolio | 220.8k $26.3m | Reduced -59.3k |
| OBERWEIS ASSET MANAGEMENT INC/ 0.50% of their portfolio | 202.0k $24.0m | Added +46.0k |
| Ophir Asset Management Pty Ltd 1.97% of their portfolio | 201.5k $24.0m | Reduced -134.3k |
| BARCLAYS PLC 0.01% of their portfolio | 191.8k $22.8m | Added +3.5k |
| NEXT CENTURY GROWTH INVESTORS LLC 1.18% of their portfolio | 187.1k $22.3m | Added +17.8k |
| BAMCO INC /NY/ 0.03% of their portfolio | 181.4k $21.6m | Reduced -2.5k |
| SEI INVESTMENTS CO 0.02% of their portfolio | 178.8k $21.3m | Reduced -20.1k |
| First Light Asset Management, LLC 1.21% of their portfolio | 167.1k $19.9m | Reduced -1.0k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.01% of their portfolio | 166.0k $19.7m | Reduced -639 |
| Prosight Management, LP 3.39% of their portfolio | 165.5k $19.7m | Added +155.5k |
| Schonfeld Strategic Advisors LLC 0.10% of their portfolio | 152.1k $18.1m | Added +63.9k |
| NORGES BANK 0.00% of their portfolio | 148.1k $17.6m | Not comparable |
| MORGAN STANLEY 0.00% of their portfolio | 148.0k $17.6m | Reduced -89.8k |
| TimesSquare Capital Management, LLC 0.24% of their portfolio | 137.3k $16.3m | Added +46.7k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 135.3k $16.1m | Reduced -9.9k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.15% of their portfolio | 132.5k $15.8m | Added +64.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 118.8k $14.1m | Added +11.0k |
| Nuveen, LLC 0.00% of their portfolio | 113.9k $13.6m | Added +2.2k |
| SEGALL BRYANT & HAMILL, LLC 0.15% of their portfolio | 107.5k $12.8m | Added +7.7k |
| WCM INVESTMENT MANAGEMENT, LLC 0.02% of their portfolio | 107.0k $12.7m | Reduced -1.1k |
| USS Investment Management Ltd 0.05% of their portfolio | 107.0k $12.7m | New |
| Champlain Investment Partners, LLC 0.30% of their portfolio | 97.0k $11.5m | New |
| Trexquant Investment LP 0.07% of their portfolio | 96.3k $11.5m | Reduced -15.0k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 95.9k $11.4m | Reduced -17.7k |
| FEDERATED HERMES, INC. 0.02% of their portfolio | 95.9k $11.4m | Reduced -53.6k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.01% of their portfolio | 93.0k $11.1m | Reduced -9.6k |
| Integral Health Asset Management, LLC 0.44% of their portfolio | 90.0k $10.7m | New |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 88.3k $10.5m | Reduced -2.2k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.07% of their portfolio | 85.8k $10.2m | Added +24.1k |
| Granahan Investment Management, LLC 0.36% of their portfolio | 83.9k $10.0m | Reduced -12.1k |
| C WorldWide Group Holding A/S 0.23% of their portfolio | 80.0k $9.5m | Unchanged |
| UBS Group AG 0.00% of their portfolio | 77.7k $9.2m | Reduced -14.2k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.29% of their portfolio | 75.7k $9.0m | Added +9.8k |
| Squarepoint Ops LLC 0.02% of their portfolio | 71.9k $8.5m | Added +65.7k |
| JENNISON ASSOCIATES LLC 0.00% of their portfolio | 67.9k $8.1m | Reduced -69.1k |
| Parkman Healthcare Partners LLC 0.82% of their portfolio | 67.3k $8.0m | Added +27.1k |
| Legal & General Group Plc 0.00% of their portfolio | 65.3k $7.8m | Added +13.7k |
| PFM Health Sciences, LP 0.67% of their portfolio | 65.2k $7.8m | New |
| Swiss National Bank 0.00% of their portfolio | 64.8k $7.7m | Added +1.1k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 63.3k $7.5m | Added +61.5k |
| PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio | 59.7k $7.1m | Added +6.3k |
| Amundi 0.00% of their portfolio | 56.5k $6.7m | Added +7.0k |
| Verition Fund Management LLC 0.05% of their portfolio | 56.0k $6.7m | Added +21.4k |
| Atle Fund Management AB 1.73% of their portfolio | 54.1k $6.4m | Added +31.8k |
| Susquehanna Portfolio Strategies, LLC 0.09% of their portfolio | 49.1k $5.8m | Reduced -26.8k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio | 48.7k $5.8m | Reduced -10.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 47.9k $5.7m | Added +21.0k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 44.7k $5.3m | Reduced -3.4k |
| Assenagon Asset Management S.A. 0.00% of their portfolio | 44.3k $5.3m | Reduced -225.9k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 44.2k $5.3m | Added +8.6k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 44.1k $5.2m | Added +6.7k |
| Man Group plc 0.01% of their portfolio | 43.4k $5.2m | Reduced -44.8k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 42.6k $5.0m | Added +6.3k |
| Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio | 42.3k $5.0m | Reduced -32 |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 42.0k $5.0m | Added +2.6k |
| RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio | 38.5k $4.6m | Reduced -15.3k |
| SIRIOS CAPITAL MANAGEMENT L P 0.50% of their portfolio | 34.5k $4.1m | Reduced -289 |
| Engineers Gate Manager LP 0.05% of their portfolio | 30.4k $3.6m | Reduced -18.9k |
| VANGUARD ASSET MANAGEMENT, Ltd 0.00% of their portfolio | 30.3k $3.6m | Added +1.7k |
| EFG International AG 0.06% of their portfolio | 28.9k $3.4m | Reduced -547 |