Who owns IRTC (IRTC)
Which tracked institutional funds hold IRTC, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See IRTC company fundamentals →
Ownership as of the 2026-Q1 13F filings. 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on IRTC is one-sided between 2025-Q4 and 2026-Q1: 48 added or opened and 165 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
IRTC’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes IRTC more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in IRTC divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 303 tracked filers holding IRTC, 156 increased or opened the position and 182 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in IRTC between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 21
- VANGUARD PORTFOLIO MANAGEMENT LLC$212M
- VANGUARD CAPITAL MANAGEMENT LLC$171M
- VANGUARD FIDUCIARY TRUST CO$26M
- TUDOR INVESTMENT CORP ET AL$22M
- BAMCO INC /NY/$22M
- Susquehanna Portfolio Strategies, LLC$9M
Full exits 38
- VANGUARD GROUP INC$579M
- SANDS CAPITAL MANAGEMENT, LLC$302M
- WESTFIELD CAPITAL MANAGEMENT CO LP$58M
- LORD, ABBETT & CO. LLC$49M
- Driehaus Capital Management LLC$48M
- Integral Health Asset Management, LLC$23M
Largest adds
- FMR LLC$49M
- MILLENNIUM MANAGEMENT LLC$43M
- BRAIDWELL LP$33M
- Point72 Asset Management, L.P.$32M
- Holocene Advisors, LP$26M
- Ophir Asset Management Pty Ltd$17M
Largest trims
- BlackRock, Inc.$347M
- Capital Research Global Investors$150M
- Artisan Partners Limited Partnership$97M
- PRICE T ROWE ASSOCIATES INC /MD/$85M
- WELLINGTON MANAGEMENT GROUP LLP$62M
- BESSEMER GROUP INC$57M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 1,796,372 | $212M | 4.2% | 2026-Q1 |
| RTW INVESTMENTS, LP added | 1,668,500 | $197M | 3.9% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 1,608,014 | $190M | 3.7% | 2026-Q1 |
| Artisan Partners Limited Partnership trimmed | 1,450,907 | $171M | 3.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,445,710 | $171M | 3.4% | 2026-Q1 |
| FMR LLC added | 1,361,751 | $161M | 3.2% | 2026-Q1 |
| BlackRock, Inc. trimmed | 1,288,917 | $152M | 3.0% | 2026-Q1 |
| Holocene Advisors, LP added | 1,248,658 | $147M | 2.9% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC added | 1,047,452 | $124M | 2.4% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 817,110 | $96M | 1.9% | 2026-Q1 |
| STATE STREET CORP added | 788,302 | $93M | 1.8% | 2026-Q1 |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. added | 762,062 | $90M | 1.8% | 2026-Q1 |
| EVENTIDE ASSET MANAGEMENT, LLC added | 760,825 | $90M | 1.8% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 714,896 | $82M | 1.6% | 2026-Q1 |
| FULLER & THALER ASSET MANAGEMENT, INC. added | 674,698 | $80M | 1.6% | 2026-Q1 |
| BLAIR WILLIAM & CO/IL trimmed | 628,385 | $74M | 1.5% | 2026-Q1 |
| BRAIDWELL LP added | 610,192 | $72M | 1.4% | 2026-Q1 |
| Point72 Asset Management, L.P. added | 599,405 | $71M | 1.4% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP trimmed | 582,879 | $69M | 1.4% | 2026-Q1 |
| Stephens Investment Management Group LLC added | 561,530 | $66M | 1.3% | 2026-Q1 |
| D. E. Shaw & Co., Inc. added | 554,266 | $65M | 1.3% | 2026-Q1 |
| Capital Research Global Investors trimmed | 509,590 | $60M | 1.2% | 2026-Q1 |
| Allspring Global Investments Holdings, LLC added | 467,113 | $55M | 1.1% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ added | 432,539 | $51M | 1.0% | 2026-Q1 |
| Polar Capital Holdings Plc added | 421,612 | $50M | 1.0% | 2026-Q1 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 390,577 | $46M | 0.9% | 2026-Q1 |
| MACKENZIE FINANCIAL CORP added | 371,475 | $44M | 0.9% | 2026-Q1 |
| LOOMIS SAYLES & CO L P trimmed | 367,894 | $43M | 0.9% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 348,563 | $41M | 0.8% | 2026-Q1 |
| Ophir Asset Management Pty Ltd added | 335,807 | $40M | 0.8% | 2026-Q1 |
| NORTHERN TRUST CORP added | 285,086 | $34M | 0.7% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 281,897 | $33M | 0.7% | 2026-Q1 |
| FRED ALGER MANAGEMENT, LLC trimmed | 280,040 | $33M | 0.7% | 2026-Q1 |
| Assenagon Asset Management S.A. added | 270,221 | $32M | 0.6% | 2026-Q1 |
| Invesco Ltd. trimmed | 270,163 | $32M | 0.6% | 2026-Q1 |
| Rock Springs Capital Management LP added | 261,750 | $31M | 0.6% | 2026-Q1 |
| SCHRODER INVESTMENT MANAGEMENT GROUP added | 247,746 | $28M | 0.6% | 2026-Q1 |
| MORGAN STANLEY added | 237,799 | $28M | 0.6% | 2026-Q1 |
| AMERIPRISE FINANCIAL INC added | 236,786 | $28M | 0.6% | 2026-Q1 |
| CITIGROUP INC added | 232,123 | $27M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 226,884 | $27M | 0.5% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 223,699 | $26M | 0.5% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 215,758 | $25M | 0.5% | 2026-Q1 |
| SEI INVESTMENTS CO trimmed | 198,904 | $23M | 0.5% | 2026-Q1 |
| BARCLAYS PLC trimmed | 188,345 | $22M | 0.4% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 20,000,000 | $22M | 0.4% | 2026-Q1 |
| BAMCO INC /NY/ added | 183,900 | $22M | 0.4% | 2026-Q1 |
| NEXT CENTURY GROWTH INVESTORS LLC trimmed | 169,306 | $20M | 0.4% | 2026-Q1 |
| First Light Asset Management, LLC added | 168,116 | $20M | 0.4% | 2026-Q1 |
| MASSACHUSETTS FINANCIAL SERVICES CO /MA/ added | 166,637 | $20M | 0.4% | 2026-Q1 |
| OBERWEIS ASSET MANAGEMENT INC/ added | 156,004 | $18M | 0.4% | 2026-Q1 |
| FEDERATED HERMES, INC. added | 149,459 | $18M | 0.3% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 145,123 | $17M | 0.3% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 137,040 | $16M | 0.3% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 121,558 | $14M | 0.3% | 2026-Q1 |
| CITADEL ADVISORS LLC added | 113,600 | $13M | 0.3% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 112,864 | $13M | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 111,732 | $13M | 0.3% | 2026-Q1 |
| Trexquant Investment LP added | 111,311 | $13M | 0.3% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 107,789 | $13M | 0.3% | 2026-Q1 |
| PERCEPTIVE ADVISORS LLC trimmed | 105,026 | $12M | 0.2% | 2026-Q1 |
| WCM INVESTMENT MANAGEMENT, LLC added | 108,078 | $12M | 0.2% | 2026-Q1 |
| NEW YORK STATE COMMON RETIREMENT FUND trimmed | 102,594 | $12M | 0.2% | 2026-Q1 |
| SEGALL BRYANT & HAMILL, LLC trimmed | 99,796 | $12M | 0.2% | 2026-Q1 |
| Granahan Investment Management, LLC added | 96,022 | $11M | 0.2% | 2026-Q1 |
| UBS Group AG trimmed | 91,903 | $11M | 0.2% | 2026-Q1 |
| TimesSquare Capital Management, LLC added | 90,652 | $11M | 0.2% | 2026-Q1 |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 90,460 | $11M | 0.2% | 2026-Q1 |
| Man Group plc added | 88,210 | $10M | 0.2% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 88,133 | $10M | 0.2% | 2026-Q1 |
| M&G PLC added | 85,062 | $10M | 0.2% | 2026-Q1 |
| C WorldWide Group Holding A/S | 80,000 | $9M | 0.2% | 2026-Q1 |
| Susquehanna Portfolio Strategies, LLC added | 75,961 | $9M | 0.2% | 2026-Q1 |
| Thrivent Financial for Lutherans added | 75,162 | $9M | 0.2% | 2026-Q1 |
| FRONTIER CAPITAL MANAGEMENT CO LLC trimmed | 68,454 | $8M | 0.2% | 2026-Q1 |
| PEREGRINE CAPITAL MANAGEMENT LLC added | 65,875 | $8M | 0.2% | 2026-Q1 |
| Swiss National Bank added | 63,700 | $8M | 0.1% | 2026-Q1 |
| SILVERCREST ASSET MANAGEMENT GROUP LLC added | 61,681 | $7M | 0.1% | 2026-Q1 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 58,800 | $7M | 0.1% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. trimmed | 36,299 | $6M | 0.1% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 53,800 | $6M | 0.1% | 2026-Q1 |
| PRINCIPAL FINANCIAL GROUP INC trimmed | 53,476 | $6M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 3,261,167 | $579M | 11.4% | 2025-Q4 stale |
| SANDS CAPITAL MANAGEMENT, LLC trimmed | 1,699,645 | $302M | 5.9% | 2025-Q4 stale |
| Champlain Investment Partners, LLC trimmed | 365,627 | $63M | 1.2% | 2025-Q3 stale |
| WESTFIELD CAPITAL MANAGEMENT CO LP added | 325,063 | $58M | 1.1% | 2025-Q4 stale |
| LORD, ABBETT & CO. LLC trimmed | 277,212 | $49M | 1.0% | 2025-Q4 stale |
| Driehaus Capital Management LLC added | 267,968 | $48M | 0.9% | 2025-Q4 stale |
| Slate Path Capital LP trimmed | 365,400 | $38M | 0.8% | 2025-Q1 stale |
| Integral Health Asset Management, LLC added | 130,000 | $23M | 0.5% | 2025-Q4 stale |
| Walleye Capital LLC added | 127,596 | $23M | 0.4% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC trimmed | 89,220 | $15M | 0.3% | 2025-Q3 stale |
| Alberta Investment Management Corp | 145,166 | $15M | 0.3% | 2025-Q1 stale |
| Freestone Grove Partners LP trimmed | 63,140 | $11M | 0.2% | 2025-Q4 stale |
| PFM Health Sciences, LP trimmed | 64,998 | $11M | 0.2% | 2025-Q3 stale |
| NORGES BANK trimmed | 56,237 | $10M | 0.2% | 2025-Q4 stale |
| Jain Global LLC trimmed | 54,844 | $10M | 0.2% | 2025-Q4 stale |
| MACQUARIE GROUP LTD trimmed | 51,421 | $9M | 0.2% | 2025-Q3 stale |
| STEADFAST CAPITAL MANAGEMENT LP added | 41,000 | $7M | 0.1% | 2025-Q4 stale |
| Informed Momentum Co LLC trimmed | 37,092 | $7M | 0.1% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.