Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Held by 13F filers
649,230,200
selection includes debt or preferreds — no % of shares outstanding
Holders
50
-2 vs 2026-03-31 · 13 new, 15 exited
Value
$724.2M
shares +12.4% vs prior quarter
13F holdings exceed the share count. This is normal for heavily shorted stocks: shares lent to short sellers are reported by the lender and again by whoever bought them. Related filers occasionally report the same position twice as well.
Share classes (cover page of the 10-Q filed 2026-08-06, as of 2026-07-30)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | IRTC · NASDAQ | 32,963,003 | 35,652,872 | 108.2% | 305 | 450056106 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (50 of 50 · 450056AB2)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | TENOR CAPITAL MANAGEMENT Co., L.P. | 87,500,000 | — | $97.1M | +2,500,000 (+2.9%) |
| 2 | WOLVERINE ASSET MANAGEMENT LLC | 66,375,000 | — | $73.2M | +19,362,000 (+41.2%) |
| 3 | UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | 59,300,000 | — | $65.0M | NEW |
| 4 | ADVENT CAPITAL MANAGEMENT /DE/ | 47,419,000 | — | $52.5M | NEW |
| 5 | LMR Partners LLP | 42,500,000 | — | $46.8M | +12,500,000 (+41.7%) |
| 6 | Opti Capital Management, LP | 41,000,000 | — | $45.3M | +6,000,000 (+17.1%) |
| 7 | DeepCurrents Investment Group LLC | 38,500,000 | — | $42.5M | +4,000,000 (+11.6%) |
| 8 | STEELHEAD PARTNERS LLC | 38,122,000 | — | $42.1M | +2,000,000 (+5.5%) |
| 9 | MacKay Shields LLC | 32,598,000 | — | $35.9M | -33,000 (-0.1%) |
| 10 | CITADEL ADVISORS LLC | 31,580,000 | — | $34.9M | NEW |
| 11 | BlackRock, Inc. | 30,880,000 | — | $33.9M | -26,435,000 (-46.1%) |
| 12 | TUDOR INVESTMENT CORP ET AL | 21,750,000 | — | $24.0M | +1,750,000 (+8.8%) |
| 13 | STATE STREET CORP | 16,860,000 | — | $18.7M | +3,150,000 (+23.0%) |
| 14 | Universal- Beteiligungs- und Servicegesellschaft mbH | 12,620,000 | — | $14.0M | NEW |
| 15 | Mirabaud Asset Management (France) SAS | 11,660,000 | — | $12.9M | NEW |
| 16 | PenderFund Capital Management Ltd. | 9,260,000 | — | $10.2M | NEW |
| 17 | AMERIPRISE FINANCIAL INC | 8,900,000 | — | $9.8M | — |
| 18 | FMR LLC | 7,633,000 | — | $8.4M | -45,000 (-0.6%) |
| 19 | Lombard Odier Asset Management (Europe) Ltd | 5,828,000 | — | $6.5M | — |
| 20 | Calamos Advisors LLC | 5,000,000 | — | $5.5M | — |
| 21 | SSI INVESTMENT MANAGEMENT LLC | 4,636,000 | — | $5.1M | — |
| 22 | STATE OF WISCONSIN INVESTMENT BOARD | 4,000,000 | — | $4.4M | +1,000,000 (+33.3%) |
| 23 | JPMORGAN CHASE & CO | 3,822,000 | — | $4.2M | -6,521,000 (-63.0%) |
| 24 | SHENKMAN CAPITAL MANAGEMENT INC | 3,574,000 | — | $4.0M | -426,000 (-10.7%) |
| 25 | LAZARD ASSET MANAGEMENT LLC | 2,596,000 | — | $29K | NEW |
| 26 | BNP PARIBAS ASSET MANAGEMENT Holding S.A. | 2,500,000 | — | $2.8M | — |
| 27 | Invesco Ltd. | 2,475,000 | — | $2.7M | -1,000,000 (-28.8%) |
| 28 | TORONTO DOMINION BANK | 2,000,000 | — | $2.2M | NEW |
| 29 | Man Group plc | 1,875,000 | — | $2.1M | +400,000 (+27.1%) |
| 30 | RWC Asset Management LLP | 1,402,000 | — | $1.5M | -71,000 (-4.8%) |
| 31 | Balyasny Asset Management L.P. | 1,000,000 | — | $1.1M | -2,000,000 (-66.7%) |
| 32 | Zurcher Kantonalbank (Zurich Cantonalbank) | 900,000 | — | $982K | +500,000 (+125.0%) |
| 33 | WELLS FARGO & COMPANY/MN | 600,000 | — | $662K | -7,000 (-1.2%) |
| 34 | Kohlberg Kravis Roberts & Co. L.P. | 450,000 | — | $496K | — |
| 35 | BANK OF AMERICA CORP /DE/ | 422,000 | — | $463K | NEW |
| 36 | BARCLAYS PLC | 310,000 | — | $342K | NEW |
| 37 | SEI INVESTMENTS CO | 269,000 | — | $295K | — |
| 38 | Jefferies Financial Group Inc. | 261,000 | — | $289K | -1,951,000 (-88.2%) |
| 39 | Central Pacific Bank - Trust Division | 249,000 | — | $273K | — |
| 40 | Bank of New York Mellon Corp | 200,000 | — | $221K | — |
| 41 | Virtus Fixed Income Advisers, LLC | 177,000 | — | $194K | NEW |
| 42 | OPPENHEIMER ASSET MANAGEMENT INC. | 69,000 | — | $76K | -1,000 (-1.4%) |
| 43 | VIRTUS ADVISERS, LLC | 41,000 | — | $45K | — |
| 44 | UBS Group AG | 36,000 | — | $39K | +19,000 (+111.8%) |
| 45 | CSS LLC/IL | 23,000 | — | $25K | — |
| 46 | STEPHENS INC /AR/ | 20,000 | — | $22K | -1,000 (-4.8%) |
| 47 | SG Americas Securities, LLC | 18,500 | — | $2.0M | NEW |
| 48 | MORGAN STANLEY | 12,000 | — | $13K | -300,000 (-96.2%) |
| 49 | NINE MASTS CAPITAL Ltd | 5,000 | — | $5.5M | NEW |
| 50 | Alken Asset Management Ltd | 2,700 | — | $3.0M | +800 (+42.1%) |
Exited since 2026-03-31 (15 filers; largest 15 shown)
| Point72 Asset Management, L.P. | −33,000,000 |
| Alberta Investment Management Corp | −20,000,000 |
| Jain Global LLC | −15,000,000 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | −13,000,000 |
| MILLENNIUM MANAGEMENT LLC | −11,000,000 |
| READYSTATE ASSET MANAGEMENT LP | −10,000,000 |
| CITIGROUP INC | −5,097,000 |
| Linden Advisors LP | −4,086,000 |
| GOLDMAN SACHS GROUP INC | −3,950,000 |
| Warberg Asset Management LLC | −2,000,000 |
| JANE STREET GROUP, LLC | −1,400,000 |
| OAKTREE CAPITAL MANAGEMENT LP | −1,350,000 |
| Boussard & Gavaudan Investment Management LLP | −11,000 |
| Balboa Wealth Partners | −11,000 |
| ROYAL BANK OF CANADA | −3,000 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| Roderick Wong | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 2,182,631 | 6.6% |
| RTW Investments, LP | SCHEDULE 13G/A | 2026-08-14 | 2026-06-30 | 2,182,631 | 6.6% |
| Artisan Partners Limited Partnership | SCHEDULE 13G | 2026-08-13 | 2026-06-30 | 1,660,307 | 5.1% |
| Artisan Investments GP LLC | SCHEDULE 13G | 2026-08-13 | 2026-06-30 | 1,660,307 | 5.1% |
| Artisan Partners Holdings LP | SCHEDULE 13G | 2026-08-13 | 2026-06-30 | 1,660,307 | 5.1% |
| Artisan Partners Asset Management Inc. | SCHEDULE 13G | 2026-08-13 | 2026-06-30 | 1,660,307 | 5.1% |
| SANDS CAPITAL MANAGEMENT, LLC | SCHEDULE 13G/A | 2026-05-08 | 2026-03-31 | 0 | 0% |
| SANDS FRANK M. | SCHEDULE 13G/A | 2026-05-08 | 2026-03-31 | 0 | 0% |
| Vanguard Portfolio Management | SCHEDULE 13G | 2026-04-28 | 2026-03-31 | 1,824,090 | 5.64% |
| Vanguard Capital Management | SCHEDULE 13G | 2026-04-27 | 2026-03-31 | 1,691,483 | 5.23% |
| The Vanguard Group | SCHEDULE 13G/A | 2026-03-26 | 2026-03-13 | 0 | 0% |
| Israel A. Englander | SCHEDULE 13G | 2026-03-23 | 2026-03-16 | 1,664,203 | 5.1% |
| Millennium Group Management LLC | SCHEDULE 13G | 2026-03-23 | 2026-03-16 | 1,664,203 | 5.1% |
| Millennium Management LLC | SCHEDULE 13G | 2026-03-23 | 2026-03-16 | 1,664,203 | 5.1% |
| Capital Research Global Investors | SCHEDULE 13G/A | 2025-08-13 | 2025-06-30 | 1,506,864 | 4.7% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.