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 ($33.9m this quarter). Holder counts are more reliable. Shares outstanding: 32.1m as of 2025-07-24, 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 ≈ $153.76. Options: 12 managers hold calls ($27.3m notional), 10 hold puts ($37.6m).
Trends to Q2 2025
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 |
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 2023 | 112 | 93 |
| Q4 2023 | 117 | 102 |
| Q1 2024 | 128 | 111 |
| Q2 2024 | 130 | 117 |
| Q3 2024 | 131 | 100 |
| Q4 2024 | 99 | 134 |
| Q1 2025 | 133 | 102 |
| Q2 2025 | 167 | 116 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2024 | $66.8m | $40.8m | 0.61 |
| Q4 2024 | $11.4m | $25.8m | 2.25 |
| Q1 2025 | $14.4m | $24.0m | 1.66 |
| Q2 2025 | $27.3m | $37.6m | 1.38 |
Biggest buyers
| Holocene Advisors, LP | Added | +298.3k |
| Man Group plc | New | +267.6k |
| LOOMIS SAYLES & CO L P | New | +255.5k |
| D. E. Shaw & Co., Inc. | New | +247.8k |
| WELLINGTON MANAGEMENT GROUP LLP | Added | +229.7k |
| BNP PARIBAS FINANCIAL MARKETS | Added | +179.8k |
| Driehaus Capital Management LLC | New | +161.6k |
| ROYAL BANK OF CANADA | Added | +147.9k |
| Squarepoint Ops LLC | Added | +130.5k |
| VANGUARD GROUP INC | Added | +127.5k |
Biggest sellers
| Capital Research Global Investors | Reduced | -695.8k |
| MACKENZIE FINANCIAL CORP | Reduced | -426.1k |
| Slate Path Capital LP | Sold out | -365.4k |
| WESTFIELD CAPITAL MANAGEMENT CO LP | Reduced | -326.5k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Reduced | -295.4k |
| BRAIDWELL LP | Reduced | -256.4k |
| Ophir Asset Management Pty Ltd | Reduced | -175.6k |
| Champlain Investment Partners, LLC | Reduced | -161.6k |
| UBS Group AG | Reduced | -147.8k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | Reduced | -145.2k |
Biggest calls
| Point72 Asset Management, L.P. | New | $12.3m80.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $5.6m36.5k shares |
| CITADEL ADVISORS LLC | Reduced | $3.4m21.9k shares |
| NOMURA HOLDINGS INC | New | $2.6m17.2k shares |
| JANE STREET GROUP, LLC | Reduced | $1.5m10.0k shares |
| WOLVERINE TRADING, LLC | Added | $1.3m8.2k shares |
| Walleye Trading LLC | Reduced | $200.1k1.3k shares |
| SIMPLEX TRADING, LLC | Reduced | $123.0k800 shares |
| Cubist Systematic Strategies, LLC | New | $92.4k600 shares |
| SteelPeak Wealth, LLC | New | $46.2k300 shares |
Biggest puts
| JANE STREET GROUP, LLC | Reduced | $14.8m96.4k shares |
| GROUP ONE TRADING LLC | Added | $8.3m54.1k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $8.0m51.7k shares |
| CITADEL ADVISORS LLC | Added | $3.2m20.7k shares |
| Squarepoint Ops LLC | Unchanged | $1.1m7.4k shares |
| WOLVERINE TRADING, LLC | Added | $1.1m6.9k shares |
| NOMURA HOLDINGS INC | New | $893.0k5.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $138.0k900 shares |
| WOLVERINE ASSET MANAGEMENT LLC | Unchanged | $46.2k300 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 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 in Q2 2025
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 |
|---|---|---|---|---|---|
| Q3 2023 | 0 | — | 4 | $597.9k | — |
| Q4 2023 | 0 | — | 1 | $149.8k | — |
| Q1 2024 | 0 | — | 8 | $6.8m | — |
| Q2 2024 | 1 | $21.0k | 2 | $145.9k | — |
| Q3 2024 | 0 | — | 4 | $521.1k | — |
| Q4 2024 | 1 | $500.9k | 2 | $1.5m | — |
| Q1 2025 | 0 | — | 8 | $10.1m | — |
| Q2 2025 | 0 | — | 4 | $2.2m | $644.9k |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-06-23 | Wilson Daniel G. Chief Financial Officer | Sold plan | $450.0k3.0k shares |
| 2025-06-23 | Patterson Chad Chief Commercial Officer | Sold plan | $140.4k936 shares |
| 2025-06-10 | Patterson Chad Chief Commercial Officer | Sold plan | $54.5k363 shares |
| 2025-06-02 | Shrishrimal Sumi EVP, Chief Risk Officer | Sold | $225.5k1.6k shares |
| 2025-06-02 | Rosenbaum Marc W. Chief Accounting Officer | Sold | $97.6k696 shares |
| 2025-05-02 | Patterson Chad Chief Commercial Officer | Sold | $1.0m8.5k shares |
| 2025-05-02 | Wilson Daniel G. Chief Financial Officer | Sold | $250.0k2.0k 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 2025
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 3.2m $498.2m | Added +127.5k |
| SANDS CAPITAL MANAGEMENT, LLC 1.29% of their portfolio | 2.9m $448.9m | Reduced -100.7k |
| BlackRock, Inc. 0.01% of their portfolio | 2.7m $423.3m | Added +46.3k |
| Artisan Partners Limited Partnership 0.63% of their portfolio | 2.7m $422.0m | Reduced -73.4k |
| Capital Research Global Investors 0.05% of their portfolio | 1.5m $232.0m | Reduced -695.8k |
| STATE STREET CORP 0.01% of their portfolio | 868.5k $133.7m | Reduced -49.2k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 767.3k $118.2m | Added +17.0k |
| BLAIR WILLIAM & CO/IL 0.32% of their portfolio | 739.3k $113.8m | Reduced -50.7k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.28% of their portfolio | 734.6k $113.1m | Reduced -145.2k |
| MACKENZIE FINANCIAL CORP 0.15% of their portfolio | 729.8k $112.4m | Reduced -426.1k |
| EVENTIDE ASSET MANAGEMENT, LLC 1.87% of their portfolio | 691.6k $106.5m | Reduced -48.5k |
| Champlain Investment Partners, LLC 0.71% of their portfolio | 661.2k $101.8m | Reduced -161.6k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.02% of their portfolio | 607.7k $93.6m | Reduced -295.4k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.33% of their portfolio | 586.5k $90.3m | Added +68.2k |
| BESSEMER GROUP INC 0.14% of their portfolio | 569.2k $87.6m | Reduced -4.9k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 563.2k $86.7m | Added +687 |
| Stephens Investment Management Group LLC 1.12% of their portfolio | 552.9k $85.1m | Added +32.3k |
| Allspring Global Investments Holdings, LLC 0.11% of their portfolio | 434.3k $63.4m | Reduced -84.3k |
| FMR LLC 0.00% of their portfolio | 420.2k $64.7m | Reduced -43.0k |
| WELLINGTON MANAGEMENT GROUP LLP 0.01% of their portfolio | 395.3k $60.9m | Added +229.7k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 394.6k $60.8m | Reduced -39.2k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 349.3k $53.8m | Reduced -8.2k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 347.6k $53.5m | Reduced -24.3k |
| MILLENNIUM MANAGEMENT LLC 0.05% of their portfolio | 336.3k $51.8m | Reduced -63.4k |
| FRED ALGER MANAGEMENT, LLC 0.22% of their portfolio | 325.5k $50.1m | Added +75.8k |
| Point72 Asset Management, L.P. 0.12% of their portfolio | 322.1k $49.6m | Reduced -98.2k |
| Holocene Advisors, LP 0.12% of their portfolio | 313.1k $48.2m | Added +298.3k |
| BRAIDWELL LP 1.58% of their portfolio | 300.0k $46.2m | Reduced -256.4k |
| JENNISON ASSOCIATES LLC 0.03% of their portfolio | 297.5k $45.8m | Added +17.3k |
| SEI INVESTMENTS CO 0.05% of their portfolio | 290.6k $44.7m | Reduced -22.1k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.19% of their portfolio | 290.6k $44.7m | Reduced -326.5k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 289.3k $44.5m | Reduced -2.7k |
| LORD, ABBETT & CO. LLC 0.14% of their portfolio | 287.5k $44.3m | Added +28.8k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 271.5k $41.8m | Added +16.9k |
| Man Group plc 0.09% of their portfolio | 267.6k $41.2m | New |
| LOOMIS SAYLES & CO L P 0.05% of their portfolio | 255.5k $39.3m | New |
| D. E. Shaw & Co., Inc. 0.04% of their portfolio | 247.8k $38.2m | New |
| Rock Springs Capital Management LP 2.33% of their portfolio | 242.5k $37.3m | Reduced -11.8k |
| NEXT CENTURY GROWTH INVESTORS LLC 2.67% of their portfolio | 224.9k $34.6m | Added +16.6k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.03% of their portfolio | 221.0k $34.2m | Reduced -93.7k |
| BARCLAYS PLC 0.01% of their portfolio | 215.3k $33.1m | Added +14.8k |
| Nuveen, LLC 0.01% of their portfolio | 214.0k $32.9m | Added +121.3k |
| Ophir Asset Management Pty Ltd 4.50% of their portfolio | 202.1k $28.3m | Reduced -175.6k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.03% of their portfolio | 195.6k $30.1m | Reduced -716 |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 192.2k $29.6m | Reduced -12.7k |
| First Light Asset Management, LLC 3.74% of their portfolio | 187.4k $28.8m | Reduced -137.7k |
| BNP PARIBAS FINANCIAL MARKETS 0.02% of their portfolio | 183.3k $28.2m | Added +179.8k |
| MORGAN STANLEY 0.00% of their portfolio | 177.9k $27.4m | Reduced -54.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.03% of their portfolio | 170.0k $26.2m | Added +9.1k |
| CITIGROUP INC 0.02% of their portfolio | 166.7k $25.7m | Reduced -18.4k |
| Driehaus Capital Management LLC 0.20% of their portfolio | 161.6k $24.9m | New |
| Squarepoint Ops LLC 0.05% of their portfolio | 160.4k $24.7m | Added +130.5k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 155.4k $23.9m | Added +147.9k |
| Freestone Grove Partners LP 0.18% of their portfolio | 154.3k $23.8m | Added +17.3k |
| RENAISSANCE TECHNOLOGIES LLC 0.03% of their portfolio | 141.2k $21.7m | Added +119.1k |
| SEGALL BRYANT & HAMILL, LLC 0.30% of their portfolio | 137.3k $21.1m | Added +6.5k |
| AMERIPRISE FINANCIAL INC 0.01% of their portfolio | 135.3k $20.8m | Added +66.6k |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ 0.01% of their portfolio | 126.5k $19.5m | New |
| RAYMOND JAMES FINANCIAL INC 0.01% of their portfolio | 116.5k $17.9m | Added +6.3k |
| Cubist Systematic Strategies, LLC 0.18% of their portfolio | 110.7k $17.0m | Added +67.0k |
| FRONTIER CAPITAL MANAGEMENT CO LLC 0.15% of their portfolio | 106.4k $16.4m | Reduced -118.5k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 100.0k $15.4m | Added +96.9k |
| Invesco Ltd. 0.00% of their portfolio | 94.3k $14.5m | Added +72.1k |
| JANE STREET GROUP, LLC 0.02% of their portfolio | 88.2k $13.6m | Added +42.4k |
| PFM Health Sciences, LP 1.18% of their portfolio | 88.2k $13.6m | New |
| Verition Fund Management LLC 0.08% of their portfolio | 87.5k $13.5m | Reduced -79.0k |
| OBERWEIS ASSET MANAGEMENT INC/ 0.54% of their portfolio | 81.2k $12.5m | New |
| C WorldWide Group Holding A/S 0.17% of their portfolio | 80.0k $12.3m | Unchanged |
| PRINCIPAL FINANCIAL GROUP INC 0.01% of their portfolio | 79.2k $12.2m | Added +28.7k |
| WCM INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio | 77.2k $11.9m | Reduced -61.3k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.36% of their portfolio | 76.6k $11.8m | Reduced -6.5k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.02% of their portfolio | 75.0k $11.5m | Reduced -25.0k |
| Engineers Gate Manager LP 0.14% of their portfolio | 74.8k $11.5m | Added +20.3k |
| M&G PLC 0.06% of their portfolio | 74.4k $11.5m | New |
| Walleye Capital LLC 0.11% of their portfolio | 73.8k $11.4m | New |
| TimesSquare Capital Management, LLC 0.16% of their portfolio | 71.7k $11.0m | New |
| STATE OF WISCONSIN INVESTMENT BOARD 0.03% of their portfolio | 68.5k $10.5m | Reduced -6.6k |
| Trexquant Investment LP 0.11% of their portfolio | 65.2k $10.0m | Added +44.4k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.02% of their portfolio | 64.7k $10.0m | Added +9.6k |
| Jump Financial, LLC 0.12% of their portfolio | 62.8k $9.7m | New |
| Amundi 0.00% of their portfolio | 60.6k $8.7m | Reduced -35.2k |
| Swiss National Bank 0.01% of their portfolio | 60.0k $9.2m | Reduced -700 |
| VICTORY CAPITAL MANAGEMENT INC 0.01% of their portfolio | 59.9k $9.2m | Added +56.2k |
| MACQUARIE GROUP LTD 0.01% of their portfolio | 57.5k $8.9m | Added +2.6k |
| FIRST TRUST ADVISORS LP 0.01% of their portfolio | 56.2k $8.7m | Added +22.3k |
| Connor, Clark & Lunn Investment Management Ltd. 0.03% of their portfolio | 53.9k $8.3m | New |
| Point72 (DIFC) Ltd 0.61% of their portfolio | 50.0k $7.7m | Reduced -22.1k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.05% of their portfolio | 49.1k $7.6m | Reduced -45.8k |
| RHUMBLINE ADVISERS 0.01% of their portfolio | 48.5k $7.5m | Added +2.5k |
| FEDERATED HERMES, INC. 0.01% of their portfolio | 48.4k $7.5m | New |
| CASTLEARK MANAGEMENT LLC 0.22% of their portfolio | 48.2k $7.4m | Reduced -110 |
| Qube Research & Technologies Ltd 0.01% of their portfolio | 47.4k $7.3m | New |
| PRUDENTIAL FINANCIAL INC 0.01% of their portfolio | 45.8k $7.1m | Added +43.5k |
| Balyasny Asset Management L.P. 0.02% of their portfolio | 44.7k $6.9m | Added +34.1k |
| Legal & General Group Plc 0.00% of their portfolio | 44.0k $6.8m | Added +1.1k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.17% of their portfolio | 41.9k $6.4m | Reduced -550 |
| Integral Health Asset Management, LLC 0.58% of their portfolio | 40.0k $6.2m | New |
| Hillsdale Investment Management Inc. 0.21% of their portfolio | 37.5k $5.8m | New |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 37.4k $5.8m | Added +547 |
| UBS Group AG 0.00% of their portfolio | 35.3k $5.4m | Reduced -147.8k |