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 ($2.6m this quarter). Holder counts are more reliable. Shares outstanding: 31.2m as of 2024-07-25, 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 ≈ $107.62. Options: 9 managers hold calls ($17.2m notional), 13 hold puts ($33.3m).
Trends to Q2 2024
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 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q4 2022 | 93 | 126 |
| Q1 2023 | 114 | 93 |
| Q2 2023 | 94 | 110 |
| Q3 2023 | 112 | 93 |
| Q4 2023 | 117 | 102 |
| Q1 2024 | 128 | 111 |
| Q2 2024 | 130 | 117 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2023 | $40.1m | $34.6m | 0.86 |
| Q4 2023 | $24.8m | $27.2m | 1.10 |
| Q1 2024 | $27.7m | $27.7m | 1.00 |
| Q2 2024 | $17.2m | $33.3m | 1.94 |
Biggest buyers
| Artisan Partners Limited Partnership | Added | +540.3k |
| MILLENNIUM MANAGEMENT LLC | Added | +371.4k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | Added | +351.9k |
| CITIGROUP INC | Added | +189.8k |
| Champlain Investment Partners, LLC | Added | +163.5k |
| BANK OF AMERICA CORP /DE/ | Added | +154.8k |
| DEUTSCHE BANK AG\ | Added | +147.0k |
| STATE STREET CORP | Added | +127.6k |
| Holocene Advisors, LP | Added | +124.0k |
| BARCLAYS PLC | Added | +119.2k |
Biggest sellers
| LORD, ABBETT & CO. LLC | Sold out | -483.4k |
| First Light Asset Management, LLC | Sold out | -420.9k |
| PERCEPTIVE ADVISORS LLC | Reduced | -210.0k |
| MORGAN STANLEY | Reduced | -200.8k |
| Bank of New York Mellon Corp | Reduced | -181.0k |
| EXCHANGE TRADED CONCEPTS, LLC | Reduced | -164.7k |
| CITADEL ADVISORS LLC | Reduced | -154.0k |
| NORGES BANK | Reduced | -151.2k |
| Legal & General Group Plc | Reduced | -115.6k |
| Balyasny Asset Management L.P. | Reduced | -102.3k |
Biggest calls
| MILLENNIUM MANAGEMENT LLC | Reduced | $7.5m70.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $5.4m50.2k shares |
| CITADEL ADVISORS LLC | Added | $2.5m23.6k shares |
| SIMPLEX TRADING, LLC | Reduced | $645.0k6.0k shares |
| GTS SECURITIES LLC | Added | $366.0k3.4k shares |
| Walleye Capital LLC | Added | $366.0k3.4k shares |
| WOLVERINE TRADING, LLC | Added | $279.9k2.6k shares |
| GROUP ONE TRADING LLC | Reduced | $53.8k500 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| JANE STREET GROUP, LLC | Added | $9.9m91.6k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $5.6m52.4k shares |
| GROUP ONE TRADING LLC | Added | $5.4m49.8k shares |
| UBS Group AG | Unchanged | $3.0m28.0k shares |
| CITADEL ADVISORS LLC | Reduced | $3.0m27.9k shares |
| WOLVERINE TRADING, LLC | Added | $1.7m16.0k shares |
| GTS SECURITIES LLC | Added | $1.1m10.1k shares |
| JPMORGAN CHASE & CO | New | $1.1m10.0k shares |
| SIMPLEX TRADING, LLC | Reduced | $979.0k9.1k shares |
| WOLVERINE ASSET MANAGEMENT LLC | Unchanged | $818.1k7.6k 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 2024
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 2022 | 0 | — | 3 | $2.1m | — |
| Q4 2022 | 0 | — | 3 | $1.8m | — |
| Q1 2023 | 0 | — | 4 | $2.0m | — |
| Q2 2023 | 1 | $997.6k | 1 | $123.6k | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2024-06-03 | Shrishrimal Sumi EVP, Chief Risk Officer | Sold | $100.6k1.1k shares |
| 2024-06-03 | Rosenbaum Marc W. Chief Accounting Officer | Sold | $45.3k510 shares |
| 2024-05-31 | Patterson Chad Chief Commercial Officer | Bought | $21.0k280 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 2024
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 3.0m $320.9m | Added +32.2k |
| Artisan Partners Limited Partnership 0.44% of their portfolio | 2.7m $289.0m | Added +540.3k |
| BlackRock Inc. 0.01% of their portfolio | 2.5m $269.4m | Added +61.2k |
| Capital Research Global Investors 0.06% of their portfolio | 2.5m $268.5m | Reduced -895 |
| SANDS CAPITAL MANAGEMENT, LLC 0.67% of their portfolio | 2.1m $228.8m | Reduced -17.0k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.9m $203.9m | Reduced -31.9k |
| MACKENZIE FINANCIAL CORP 0.23% of their portfolio | 1.4m $153.7m | Added +80.1k |
| ALLIANCEBERNSTEIN L.P. 0.05% of their portfolio | 1.3m $136.5m | Added +33.0k |
| Holocene Advisors, LP 0.47% of their portfolio | 1.0m $112.2m | Added +124.0k |
| STATE STREET CORP 0.00% of their portfolio | 896.9k $96.5m | Added +127.6k |
| BLAIR WILLIAM & CO/IL 0.27% of their portfolio | 799.1k $86.0m | Reduced -33.9k |
| Champlain Investment Partners, LLC 0.49% of their portfolio | 739.3k $79.6m | Added +163.5k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 727.9k $78.4m | Added +37.1k |
| Invesco Ltd. 0.02% of their portfolio | 685.7k $73.8m | Added +101.7k |
| WESTFIELD CAPITAL MANAGEMENT CO LP 0.32% of their portfolio | 609.1k $65.6m | Added +106.4k |
| Point72 Asset Management, L.P. 0.19% of their portfolio | 536.2k $57.7m | Added +58.7k |
| BRAIDWELL LP 1.78% of their portfolio | 526.4k $56.7m | Added +43.1k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.14% of their portfolio | 511.9k $55.1m | Added +24 |
| Slate Path Capital LP 1.11% of their portfolio | 510.5k $55.0m | Unchanged |
| MILLENNIUM MANAGEMENT LLC 0.04% of their portfolio | 496.0k $53.4m | Added +371.4k |
| Allspring Global Investments Holdings, LLC 0.08% of their portfolio | 475.6k $51.2m | Added +60.6k |
| Stephens Investment Management Group LLC 0.63% of their portfolio | 420.6k $45.3m | Added +8.8k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 401.0k $43.2m | Reduced -181.0k |
| Rock Springs Capital Management LP 1.29% of their portfolio | 397.5k $42.8m | Added +5.2k |
| Fiera Capital Corp 0.13% of their portfolio | 393.2k $42.3m | Added +4.3k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio | 386.0k $41.6m | Added +351.9k |
| LOOMIS SAYLES & CO L P 0.05% of their portfolio | 370.5k $39.9m | Added +64.5k |
| FMR LLC 0.00% of their portfolio | 362.7k $39.0m | Added +51.1k |
| MORGAN STANLEY 0.00% of their portfolio | 354.5k $38.2m | Reduced -200.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 354.1k $38.1m | Added +154.8k |
| SCHRODER INVESTMENT MANAGEMENT GROUP 0.04% of their portfolio | 313.9k $33.8m | Added +25.3k |
| Alyeska Investment Group, L.P. 0.19% of their portfolio | 310.7k $33.4m | Added +107.2k |
| SEI INVESTMENTS CO 0.04% of their portfolio | 280.0k $30.1m | Added +44.7k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.50% of their portfolio | 272.1k $29.3m | Added +33.0k |
| BESSEMER GROUP INC 0.05% of their portfolio | 268.3k $28.9m | Reduced -7.7k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 266.7k $28.7m | Reduced -15.2k |
| FRED ALGER MANAGEMENT, LLC 0.13% of their portfolio | 252.4k $27.2m | Added +28.1k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 251.5k $27.1m | Added +7.4k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.03% of their portfolio | 228.2k $24.6m | Added +18.3k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 216.8k $23.3m | Reduced -3.9k |
| CITIGROUP INC 0.02% of their portfolio | 205.9k $22.2m | Added +189.8k |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 201.5k $21.7m | Reduced -7.5k |
| DEUTSCHE BANK AG\ 0.01% of their portfolio | 201.0k $21.6m | Added +147.0k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 185.1k $19.9m | Reduced -25.0k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.02% of their portfolio | 183.0k $19.7m | Added +11.0k |
| CITADEL ADVISORS LLC 0.02% of their portfolio | 164.2k $17.7m | Reduced -154.0k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 158.8k $17.1m | Added +17.0k |
| BARCLAYS PLC 0.01% of their portfolio | 155.7k $16.8m | Added +119.2k |
| WCM INVESTMENT MANAGEMENT, LLC 0.03% of their portfolio | 141.3k $14.7m | Added +2.9k |
| SEGALL BRYANT & HAMILL, LLC 0.25% of their portfolio | 129.9k $14.0m | Added +27.5k |
| GILDER GAGNON HOWE & CO LLC 0.17% of their portfolio | 126.4k $13.6m | Added +80.4k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 109.4k $11.8m | Added +19.8k |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 97.0k $10.4m | Reduced -9.9k |
| SILVERCREST ASSET MANAGEMENT GROUP LLC 0.07% of their portfolio | 96.0k $10.3m | Added +1.4k |
| Alberta Investment Management Corp 0.11% of their portfolio | 94.7k $10.2m | Unchanged |
| NORGES BANK 0.00% of their portfolio | 83.9k $9.0m | Reduced -151.2k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.26% of their portfolio | 81.6k $8.8m | Added +12.7k |
| C WorldWide Group Holding A/S 0.09% of their portfolio | 80.0k $8.6m | Unchanged |
| Polar Capital Holdings Plc 0.05% of their portfolio | 76.7k $8.3m | Added +13.3k |
| Polar Asset Management Partners Inc. 0.20% of their portfolio | 72.6k $7.8m | Added +41.8k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.02% of their portfolio | 69.9k $7.5m | Added +1.5k |
| EAGLE ASSET MANAGEMENT INC 0.04% of their portfolio | 69.5k $7.4m | Reduced -12.1k |
| AXA S.A. 0.01% of their portfolio | 66.0k $7.1m | Added +33.0k |
| Swiss National Bank 0.00% of their portfolio | 61.3k $6.6m | Added +800 |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 60.5k $6.5m | Added +20.4k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 57.3k $6.2m | Added +3.0k |
| AEGON ASSET MANAGEMENT UK Plc 0.09% of their portfolio | 56.8k $6.1m | Not comparable |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 52.6k $5.7m | Added +5.7k |
| Assenagon Asset Management S.A. 0.01% of their portfolio | 49.0k $5.3m | Added +38.3k |
| BAMCO INC /NY/ 0.01% of their portfolio | 46.5k $5.0m | Added +1.5k |
| Susquehanna Portfolio Strategies, LLC 0.20% of their portfolio | 46.0k $5.0m | Reduced -6.7k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 45.7k $4.9m | Added +2.2k |
| COMERICA BANK 0.02% of their portfolio | 45.1k $4.9m | Added +6.2k |
| California Public Employees Retirement System 0.00% of their portfolio | 44.2k $4.8m | Added +83 |
| DLD Asset Management, LP 1.11% of their portfolio | 44.1k $4.8m | New |
| Legal & General Group Plc 0.00% of their portfolio | 41.6k $4.5m | Reduced -115.6k |
| FORMULA GROWTH LTD 1.58% of their portfolio | 40.4k $4.3m | Added +8.4k |
| Baird Financial Group, Inc. 0.01% of their portfolio | 40.3k $4.3m | Reduced -1.5k |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 39.4k $4.2m | Reduced -102.3k |
| BANQUE PICTET & CIE SA 0.04% of their portfolio | 39.1k $4.2m | Reduced -1.2k |
| PERCEPTIVE ADVISORS LLC 0.09% of their portfolio | 35.2k $3.8m | Reduced -210.0k |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.01% of their portfolio | 32.7k $3.5m | First filing |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 30.4k $3.3m | Reduced -273 |
| Trexquant Investment LP 0.05% of their portfolio | 27.5k $3.0m | Added +5.4k |
| Kampmann Melissa S. 2.05% of their portfolio | 26.1k $2.8m | Reduced -25 |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 25.7k $2.8m | Reduced -33.1k |
| UBS Group AG 0.00% of their portfolio | 24.6k $2.7m | Reduced -13.8k |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 22.5k $2.4m | Added +3.3k |
| HARBOR CAPITAL ADVISORS, INC. 0.18% of their portfolio | 21.5k $2.3m | Added +17.0k |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 21.4k $2.3m | Reduced -4.8k |
| Homestead Advisers Corp 0.06% of their portfolio | 21.3k $2.3m | Added +4.4k |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.02% of their portfolio | 20.9k $2.2m | Reduced -904 |
| B. Metzler seel. Sohn & Co. AG 0.02% of their portfolio | 20.5k $2.2m | Unchanged |
| Lighthouse Investment Partners, LLC 0.12% of their portfolio | 19.2k $2.1m | New |
| FIRST TRUST ADVISORS LP 0.00% of their portfolio | 19.1k $2.1m | Added +6.2k |
| Millrace Asset Group, Inc. 1.95% of their portfolio | 18.7k $2.0m | New |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.06% of their portfolio | 18.3k $2.0m | Reduced -600 |
| MetLife Investment Management, LLC 0.01% of their portfolio | 18.1k $1.9m | Added +2.4k |
| Corebridge Financial, Inc. 0.01% of their portfolio | 16.8k $1.8m | First filing |
| TRUIST FINANCIAL CORP 0.00% of their portfolio | 14.1k $1.5m | Reduced -281 |