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 ($2.1m this quarter). Holder counts are more reliable. Shares outstanding: 30.6m as of 2023-07-24, 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 ≈ $104.28. Options: 12 managers hold calls ($23.8m notional), 12 hold puts ($62.8m).
Trends to Q2 2023
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 233 |
| Q4 2022 | 208 |
| Q1 2023 | 209 |
| Q2 2023 | 204 |
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 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2022 | $49.0m | $36.1m | 0.74 |
| Q4 2022 | $27.3m | $22.2m | 0.81 |
| Q1 2023 | $46.1m | $33.9m | 0.73 |
| Q2 2023 | $23.8m | $62.8m | 2.64 |
Biggest buyers
| Capital Research Global Investors | Added | +539.6k |
| Artisan Partners Limited Partnership | Added | +229.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ | Added | +138.7k |
| Man Group plc | New | +131.5k |
| LORD, ABBETT & CO. LLC | Added | +126.9k |
| MILLENNIUM MANAGEMENT LLC | Added | +123.5k |
| BlackRock Inc. | Added | +104.5k |
| Slate Path Capital LP | Added | +90.0k |
| STATE STREET CORP | Added | +86.2k |
| RENAISSANCE TECHNOLOGIES LLC | Added | +73.9k |
Biggest sellers
| FMR LLC | Reduced | -2.9m |
| BANK OF AMERICA CORP /DE/ | Reduced | -444.2k |
| Fiera Capital Corp | Reduced | -289.8k |
| JANUS HENDERSON GROUP PLC | Reduced | -230.0k |
| Man Group plc | Sold out | -109.0k |
| Invesco Ltd. | Reduced | -90.5k |
| NEW YORK STATE COMMON RETIREMENT FUND | Reduced | -84.7k |
| Saraza Management, LP | Reduced | -80.0k |
| MORGAN STANLEY | Reduced | -58.3k |
| Holocene Advisors, LP | Reduced | -55.1k |
Biggest calls
| MILLENNIUM MANAGEMENT LLC | Reduced | $6.3m60.0k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $5.0m48.3k shares |
| CITADEL ADVISORS LLC | Reduced | $3.7m35.0k shares |
| Jefferies Financial Group Inc. | Added | $2.1m20.3k shares |
| PFM Health Sciences, LP | New | $2.1m20.0k shares |
| SIMPLEX TRADING, LLC | Added | $1.4m13.5k shares |
| JANE STREET GROUP, LLC | Reduced | $1.4m13.1k shares |
| D. E. Shaw & Co., Inc. | Reduced | $646.8k6.2k shares |
| Walleye Trading LLC | Reduced | $500.7k4.8k shares |
| WOLVERINE TRADING, LLC | New | $383.3k3.7k shares |
Biggest puts
| CITADEL ADVISORS LLC | Added | $20.4m195.2k shares |
| JANE STREET GROUP, LLC | Added | $16.9m162.4k shares |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $6.5m62.3k shares |
| SIMPLEX TRADING, LLC | Added | $4.2m40.6k shares |
| PURA VIDA INVESTMENTS, LLC | New | $3.9m37.7k shares |
| Walleye Trading LLC | Added | $3.5m33.5k shares |
| UBS Group AG | Unchanged | $3.1m30.0k shares |
| MILLENNIUM MANAGEMENT LLC | Reduced | $2.4m23.0k shares |
| GROUP ONE TRADING LLC | Added | $970.2k9.3k shares |
| Jefferies Financial Group Inc. | New | $521.6k5.0k 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 2023
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 2021 | 0 | — | 0 | — | — |
| Q4 2021 | 0 | — | 0 | — | — |
| Q1 2022 | 0 | — | 5 | $3.6m | — |
| Q2 2022 | 0 | — | 1 | $55.9k | — |
| 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 | — |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2023-06-06 | Blackford Quentin S. President and CEO, director | Bought | $997.6k9.8k shares |
| 2023-06-02 | Shrishrimal Sumi EVP, Chief Risk Officer | Sold | $123.6k1.1k 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 2023
| Manager | Shares | Change |
|---|---|---|
| VANGUARD GROUP INC 0.01% of their portfolio | 2.9m $305.8m | Added +17.5k |
| SANDS CAPITAL MANAGEMENT, LLC 0.77% of their portfolio | 2.4m $249.0m | Reduced -31.8k |
| BlackRock Inc. 0.01% of their portfolio | 2.4m $247.6m | Added +104.5k |
| Capital Research Global Investors 0.06% of their portfolio | 2.3m $238.7m | Added +539.6k |
| FMR LLC 0.01% of their portfolio | 1.6m $168.5m | Reduced -2.9m |
| Artisan Partners Limited Partnership 0.27% of their portfolio | 1.6m $167.2m | Added +229.4k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 1.2m $129.1m | Added +64.4k |
| MACKENZIE FINANCIAL CORP 0.19% of their portfolio | 1.2m $127.0m | Reduced -16.3k |
| ALLIANCEBERNSTEIN L.P. 0.05% of their portfolio | 1.1m $113.4m | Reduced -41.1k |
| BLAIR WILLIAM & CO/IL 0.40% of their portfolio | 1.0m $108.7m | Added +33.7k |
| Saraza Management, LP 16.24% of their portfolio | 905.0k $94.4m | Reduced -80.0k |
| STATE STREET CORP 0.00% of their portfolio | 862.9k $90.0m | Added +86.2k |
| Invesco Ltd. 0.02% of their portfolio | 757.8k $79.1m | Reduced -90.5k |
| Allspring Global Investments Holdings, LLC 0.10% of their portfolio | 619.1k $64.6m | Added +14.7k |
| GEODE CAPITAL MANAGEMENT, LLC 0.01% of their portfolio | 613.1k $64.0m | Added +27.3k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.01% of their portfolio | 609.9k $63.6m | Added +138.7k |
| NORGES BANK 0.01% of their portfolio | 593.5k $61.9m | Added +13.9k |
| Slate Path Capital LP 2.19% of their portfolio | 575.0k $60.0m | Added +90.0k |
| LORD, ABBETT & CO. LLC 0.09% of their portfolio | 500.7k $52.2m | Added +126.9k |
| CREDIT SUISSE AG/ 0.05% of their portfolio | 491.8k $51.3m | Reduced -3.1k |
| PFM Health Sciences, LP 2.04% of their portfolio | 485.5k $50.6m | Unchanged |
| BRAIDWELL LP 1.63% of their portfolio | 478.6k $49.9m | Added +24.4k |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.15% of their portfolio | 451.9k $47.1m | Reduced -40.5k |
| Holocene Advisors, LP 0.19% of their portfolio | 427.4k $44.6m | Reduced -55.1k |
| BESSEMER GROUP INC 0.09% of their portfolio | 397.1k $41.4m | Added +7.3k |
| Fiera Capital Corp 0.12% of their portfolio | 390.4k $40.7m | Reduced -289.8k |
| Balyasny Asset Management L.P. 0.11% of their portfolio | 363.6k $37.9m | Reduced -13.2k |
| Bank of New York Mellon Corp 0.01% of their portfolio | 341.3k $35.6m | Reduced -7.3k |
| Rock Springs Capital Management LP 0.77% of their portfolio | 309.4k $32.3m | Unchanged |
| Stephens Investment Management Group LLC 0.50% of their portfolio | 305.3k $31.9m | Added +7.5k |
| NORTHERN TRUST CORP 0.01% of their portfolio | 295.3k $30.8m | Added +10.6k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 289.8k $30.2m | Reduced -43.7k |
| JANUS HENDERSON GROUP PLC 0.02% of their portfolio | 248.5k $25.9m | Reduced -230.0k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.01% of their portfolio | 240.7k $25.1m | Added +4.9k |
| EVENTIDE ASSET MANAGEMENT, LLC 0.42% of their portfolio | 239.1k $24.9m | Unchanged |
| SEI INVESTMENTS CO 0.04% of their portfolio | 222.0k $23.2m | Reduced -4.2k |
| EXCHANGE TRADED CONCEPTS, LLC 0.55% of their portfolio | 214.3k $22.4m | Added +32.2k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.03% of their portfolio | 194.1k $20.3m | Reduced -84.7k |
| Legal & General Group Plc 0.01% of their portfolio | 192.4k $20.1m | Added +30.0k |
| MORGAN STANLEY 0.00% of their portfolio | 152.6k $15.9m | Reduced -58.3k |
| VICTORY CAPITAL MANAGEMENT INC 0.02% of their portfolio | 152.2k $15.9m | Reduced -579 |
| MILLENNIUM MANAGEMENT LLC 0.02% of their portfolio | 142.1k $14.8m | Added +123.5k |
| Man Group plc 0.04% of their portfolio | 131.5k $13.7m | New |
| D. E. Shaw & Co., Inc. 0.02% of their portfolio | 104.8k $10.9m | Added +62.3k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 103.9k $10.8m | Reduced -444.2k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.01% of their portfolio | 99.2k $10.3m | Added +43.6k |
| Alberta Investment Management Corp 0.09% of their portfolio | 94.7k $9.9m | Unchanged |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 84.1k $8.8m | Reduced -19.2k |
| RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio | 83.5k $8.7m | Added +73.9k |
| EAGLE ASSET MANAGEMENT INC 0.05% of their portfolio | 81.9k $8.5m | Reduced -2.5k |
| C WorldWide Group Holding A/S 0.11% of their portfolio | 80.0k $8.3m | Unchanged |
| JANE STREET GROUP, LLC 0.01% of their portfolio | 79.7k $8.3m | Added +33.0k |
| PEREGRINE CAPITAL MANAGEMENT LLC 0.22% of their portfolio | 78.2k $8.2m | Added +5.1k |
| Mirae Asset Global Investments Co., Ltd. 0.02% of their portfolio | 72.1k $7.5m | Reduced -7.3k |
| Swiss National Bank 0.00% of their portfolio | 66.4k $6.9m | Added +1.4k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 63.3k $6.6m | Reduced -11.1k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 56.0k $5.8m | Reduced -26.9k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.01% of their portfolio | 47.2k $4.9m | Reduced -1.4k |
| California Public Employees Retirement System 0.00% of their portfolio | 46.9k $4.9m | Reduced -2.1k |
| UBS Group AG 0.00% of their portfolio | 43.4k $4.5m | Added +37.6k |
| Western Standard LLC 3.87% of their portfolio | 42.8k $4.5m | New |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 42.4k $4.4m | Added +1.3k |
| Cinctive Capital Management LP 0.17% of their portfolio | 42.1k $4.4m | Reduced -25.6k |
| AXA S.A. 0.01% of their portfolio | 38.0k $4.0m | Added +3.0k |
| NEUBERGER BERMAN GROUP LLC 0.00% of their portfolio | 38.0k $4.0m | Added +9.0k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio | 37.0k $3.9m | Reduced -661 |
| Prosight Management, LP 1.10% of their portfolio | 36.0k $3.8m | New |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 33.7k $4.2m | Unchanged |
| Bridgewater Associates, LP 0.02% of their portfolio | 33.2k $3.5m | Reduced -2.6k |
| TUDOR INVESTMENT CORP ET AL 0.05% of their portfolio | 32.3k $3.4m | New |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 31.9k $3.3m | Reduced -2.3k |
| SECTORAL ASSET MANAGEMENT INC 0.52% of their portfolio | 30.0k $3.1m | Reduced -29.1k |
| BANQUE PICTET & CIE SA 0.03% of their portfolio | 29.2k $3.0m | Reduced -20.7k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 28.6k $3.0m | Added +15.2k |
| MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC 0.03% of their portfolio | 26.1k $2.7m | Reduced -2.0k |
| TWINBEECH CAPITAL LP 0.05% of their portfolio | 22.9k $2.4m | New |
| TD Asset Management Inc 0.00% of their portfolio | 22.9k $2.4m | Added +8.5k |
| GILDER GAGNON HOWE & CO LLC 0.03% of their portfolio | 22.0k $2.3m | Reduced -161 |
| State of New Jersey Common Pension Fund D 0.01% of their portfolio | 21.0k $2.2m | Reduced -1.1k |
| ClariVest Asset Management LLC 0.11% of their portfolio | 20.3k $2.1m | Reduced -2.9k |
| EULAV Asset Management 0.08% of their portfolio | 20.3k $2.1m | Unchanged |
| BARCLAYS PLC 0.00% of their portfolio | 20.1k $2.1m | Added +4.8k |
| Quantbot Technologies LP 0.13% of their portfolio | 19.8k $2.1m | New |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 18.7k $2.0m | Reduced -14.7k |
| ALGERT GLOBAL LLC 0.08% of their portfolio | 17.9k $1.9m | Reduced -222 |
| Baird Financial Group, Inc. 0.00% of their portfolio | 17.8k $1.9m | Reduced -280 |
| MACQUARIE GROUP LTD 0.00% of their portfolio | 17.1k $1.8m | Added +3.6k |
| MetLife Investment Management, LLC 0.01% of their portfolio | 16.0k $1.7m | Added +270 |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 15.6k $1.6m | Reduced -7.6k |
| TRUIST FINANCIAL CORP 0.00% of their portfolio | 15.1k $1.6m | Reduced -1.5k |
| Bradley Mark J. 1.56% of their portfolio | 15.0k $1.6m | Reduced -10.3k |
| AMERICAN INTERNATIONAL GROUP, INC. 0.01% of their portfolio | 14.8k $1.5m | Added +214 |
| CITIGROUP INC 0.00% of their portfolio | 14.6k $1.5m | Added +8.0k |
| COMERICA BANK 0.00% of their portfolio | 14.0k $76 | First filing |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 13.8k $1.4m | Added +1.1k |
| MCKINLEY CAPITAL MANAGEMENT LLC 0.18% of their portfolio | 13.1k $1.4m | New |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) 0.03% of their portfolio | 12.5k $1.3m | Reduced -3.2k |
| WoodTrust Financial Corp 0.24% of their portfolio | 12.4k $1.3m | Added +1.0k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 12.1k $1.3m | Added +648 |
| Orion Porfolio Solutions, LLC 0.01% of their portfolio | 12.1k $1.3m | Reduced -9.2k |