Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
292 institutional managers reported holding IRTC for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 50%. 36 opened new positions; 74 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 3.52M | 10.82% | $415.5M | added +6.2% | 2016 Q4 |
| BlackRock | 2.74M | 8.43% | $323.7M | trimmed -2.6% | 2016 Q4 |
| RTW Investments, LP | 1.67M | 5.13% | $197.0M | added +41.2% | 2025 Q4 |
| Millennium Management | 1.61M | 4.95% | $189.9M | added +94.6% | 2016 Q4 |
| Artisan Partners | 1.45M | 4.46% | $171.3M | trimmed -4% | 2021 Q4 |
| FMR (Fidelity) | 1.36M | 4.19% | $160.8M | added +116.6% | 2016 Q4 |
| Holocene Advisors | 1.25M | 3.84% | $147.5M | added +82.7% | 2019 Q3 |
| UBS | 1.14M | 3.50% | $134.5M | added +15.9% | 2016 Q4 |
| Geode Capital | 817.1k | 2.51% | $96.5M | trimmed -4.8% | 2016 Q4 |
| State Street | 788.3k | 2.42% | $93.1M | added +3.1% | 2016 Q4 |
| BNP Paribas Financial Markets | 782.1k | 2.41% | $92.4M | added +19.1% | 2017 Q1 |
| Eventide Asset Management, LLC | 760.8k | 2.34% | $89.8M | added +9.9% | 2022 Q2 |
| Fuller & Thaler Asset Management, INC. | 674.7k | 2.08% | $79.7M | added +5.5% | 2025 Q1 |
| Blair William & CO/IL | 628.4k | 1.93% | $74.2M | trimmed -12.6% | 2019 Q4 |
| Braidwell LP | 610.2k | 1.88% | $72.1M | added +180.7% | 2022 Q4 |
| Point72 | 599.4k | 1.84% | $70.8M | added +173.1% | 2023 Q4 |
| Arrowstreet Capital | 582.9k | 1.79% | $68.8M | trimmed -4% | 2025 Q2 |
| Stephens Investment Management Group LLC | 561.5k | 1.73% | $66.3M | added +8.1% | 2020 Q4 |
| D. E. Shaw | 554.3k | 1.71% | $65.5M | added +53.7% | 2025 Q2 |
| Capital Research Global Investors | 509.6k | 1.57% | $60.2M | trimmed -57% | 2016 Q4 |
| Allspring Global Investments Holdings, LLC | 467.1k | 1.44% | $55.2M | added +14.7% | 2021 Q4 |
| Bank OF America CORP /DE/ | 432.5k | 1.33% | $51.1M | added +21.9% | 2016 Q4 |
| Polar Capital Holdings PLC | 421.6k | 1.30% | $49.8M | added +36.8% | 2022 Q1 |
| Manufacturers Life Insurance Company, THE | 390.6k | 1.20% | $46.1M | added +99.2% | 2016 Q4 |
| Mackenzie Financial CORP | 371.5k | 1.14% | $43.9M | added +7% | 2021 Q2 |
| Loomis Sayles & CO L P | 367.9k | 1.13% | $43.4M | trimmed -6.2% | 2025 Q2 |
| Goldman Sachs | 348.6k | 1.07% | $41.2M | added +5.9% | 2016 Q4 |
| Ophir Asset Management Pty LTD (focused) | 335.8k | 1.03% | $39.7M | added +163% | 2024 Q4 |
| Invesco | 297.5k | 0.92% | $35.1M | trimmed -40.3% | 2018 Q1 |
| Northern Trust | 285.1k | 0.88% | $33.7M | added +2.2% | 2016 Q4 |
| Charles Schwab Investment Management | 281.9k | 0.87% | $33.3M | trimmed -1.5% | 2016 Q4 |
| Fred Alger Management, LLC | 280.0k | 0.86% | $33.1M | trimmed -9.8% | 2023 Q1 |
| Assenagon Asset Management S.a. | 270.2k | 0.83% | $31.9M | added +20% | 2025 Q3 |
| Rock Springs Capital Management LP | 261.8k | 0.81% | $30.9M | added +11.4% | 2017 Q3 |
| Schroder Investment Management Group | 247.7k | 0.76% | $29.3M | added +52.9% | 2024 Q1 |
| Morgan Stanley | 237.8k | 0.73% | $28.1M | added +39.9% | 2016 Q4 |
| Ameriprise Financial INC | 236.8k | 0.73% | $28.0M | added +91.5% | 2016 Q4 |
| Citigroup INC | 232.1k | 0.71% | $27.4M | added +22% | 2016 Q4 |
| Qube Research & Technologies LTD | 226.9k | 0.70% | $26.8M | added +56.9% | 2024 Q3 |
| Deutsche Bank AG\ | 215.8k | 0.66% | $25.5M | added +15% | 2016 Q4 |
| SEI Investments CO | 198.9k | 0.61% | $23.5M | trimmed -2.2% | 2018 Q1 |
| Balyasny Asset Management | 194.4k | 0.60% | $23.0M | added +16.2% | 2022 Q3 |
| Barclays PLC | 188.3k | 0.58% | $22.2M | trimmed -2.9% | 2017 Q1 |
| Bamco INC /NY/ | 183.9k | 0.57% | $21.7M | opened | 2026 Q1 |
| Next Century Growth Investors LLC | 169.3k | 0.52% | $20.0M | trimmed -2% | 2025 Q1 |
| First Light Asset Management, LLC (focused) | 168.1k | 0.52% | $19.9M | added +9.3% | 2024 Q4 |
| MFS Investment Management | 166.6k | 0.51% | $19.7M | added +10.9% | 2025 Q2 |
| Oberweis Asset Management INC/ | 156.0k | 0.48% | $18.4M | added +30.3% | 2025 Q2 |
| Federated Hermes, INC. | 149.5k | 0.46% | $17.6M | added +40.5% | 2025 Q2 |
| Raymond James Financial INC | 145.1k | 0.45% | $17.1M | trimmed -5.6% | 2022 Q3 |
Largest 50 of 292 shown; the full ranked, searchable register is at boothcheck.com/holders/IRTC. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.