Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
323 institutional managers reported holding IAC for the quarter ended Mar 31, 2026. Together they hold about 92% of shares outstanding; the top 10 hold 54%. 37 opened new positions; 64 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 7.95M | 10.35% | $318.0M | added +2.2% | ≤2013 |
| Vanguard Group | 7.04M | 9.17% | $281.6M | added +1.6% | ≤2013 |
| Aristeia Capital, L.l.c. | 5.91M | 7.70% | $236.5M | added +3.6% | 2025 Q2 |
| Southeastern Asset Management INC/TN/ (focused) | 4.02M | 5.24% | $161.0M | added +0.8% | 2021 Q3 |
| Helikon Investments LTD (focused) | 3.52M | 4.58% | $140.8M | added +88.5% | 2025 Q2 |
| Corvex Management LP (focused) | 3.36M | 4.37% | $134.3M | unchanged | 2022 Q4 |
| Patient Capital Management, LLC (focused) | 2.70M | 3.52% | $108.0M | added +13.7% | 2023 Q2 |
| Davis Selected Advisers | 2.41M | 3.15% | $96.6M | trimmed -4% | 2020 Q3 |
| State Street | 2.26M | 2.94% | $90.3M | added +2.9% | ≤2013 |
| AQR Capital | 2.20M | 2.87% | $88.2M | added +33.4% | ≤2013 |
| Bank OF Montreal /CAN/ | 2.04M | 2.65% | $81.6M | trimmed -34.9% | 2024 Q2 |
| Thompson Siegel & Walmsley LLC | 1.82M | 2.37% | $72.9M | trimmed -5.2% | 2020 Q4 |
| Geode Capital | 1.19M | 1.56% | $47.8M | added +1.3% | ≤2013 |
| Wallace Capital Management INC. | 1.12M | 1.46% | $44.8M | added +26.6% | 2025 Q3 |
| UBS | 928.6k | 1.21% | $37.2M | trimmed -7.3% | ≤2013 |
| Boston Partners | 873.3k | 1.14% | $35.0M | added +17.3% | 2025 Q4 |
| Charles Schwab Investment Management | 867.3k | 1.13% | $34.7M | added +11.3% | ≤2013 |
| Bank OF America CORP /DE/ | 832.0k | 1.08% | $33.3M | trimmed -0.6% | ≤2013 |
| Empyrean Capital Partners, LP | 820.0k | 1.07% | $32.8M | added +21.1% | 2025 Q4 |
| Morgan Stanley | 815.9k | 1.06% | $32.7M | trimmed -10.1% | ≤2013 |
| Allen Holding INC /NY (focused) | 601.1k | 0.78% | $24.1M | unchanged | ≤2013 |
| Public Sector Pension Investment Board | 594.0k | 0.77% | $23.8M | added +18.3% | 2024 Q2 |
| Highbridge Capital Management LLC | 568.5k | 0.74% | $22.7M | added +36.2% | 2023 Q4 |
| JPMorgan Chase | 568.5k | 0.74% | $22.7M | trimmed -10.6% | ≤2013 |
| Allspring Global Investments Holdings, LLC | 553.9k | 0.72% | $22.2M | trimmed -6.6% | 2021 Q4 |
| Goldman Sachs | 495.0k | 0.65% | $19.8M | added +76.7% | ≤2013 |
| Northern Trust | 472.4k | 0.62% | $18.9M | added +5.6% | ≤2013 |
| Royal Bank OF Canada | 458.4k | 0.60% | $18.3M | added +5.9% | ≤2013 |
| ACR Alpine Capital Research, LLC (focused) | 450.8k | 0.59% | $18.0M | added +4.6% | 2021 Q2 |
| BNP Paribas Financial Markets | 411.9k | 0.54% | $16.5M | added +105.1% | 2024 Q4 |
| Diamond Hill Capital Management INC | 387.0k | 0.50% | $15.5M | added +25.4% | 2025 Q4 |
| Bragg Financial Advisors, INC | 369.2k | 0.48% | $14.8M | unchanged | 2022 Q2 |
| State OF Wisconsin Investment Board | 356.1k | 0.46% | $14.3M | added +22.2% | ≤2013 |
| Royce & Associates | 338.6k | 0.44% | $13.6M | added +11.2% | 2022 Q3 |
| Allen Investment Management, LLC | 333.3k | 0.43% | $13.3M | unchanged | ≤2013 |
| BNY Mellon | 332.8k | 0.43% | $13.3M | trimmed -4.5% | ≤2013 |
| Principal Financial Group INC | 316.0k | 0.41% | $12.6M | added +2% | 2017 Q1 |
| Brooktree Capital Management (focused) | 314.4k | 0.41% | $12.6M | trimmed -2% | 2020 Q3 |
| Applied Fundamental Research, LLC (focused) | 305.1k | 0.40% | $12.2M | trimmed -31.9% | 2020 Q4 |
| Franklin Resources | 300.6k | 0.39% | $12.0M | added +4567.9% | 2025 Q3 |
| Invesco | 287.9k | 0.38% | $11.5M | trimmed -21.9% | ≤2013 |
| Foursixthree Capital LP (focused) | 274.6k | 0.36% | $11.0M | opened | 2026 Q1 |
| Arex Capital Management, LP (focused) | 250.0k | 0.33% | $10.0M | added +437.6% | 2024 Q3 |
| Acadian Asset Management | 247.8k | 0.32% | $9.9M | trimmed -21.3% | 2024 Q2 |
| Harspring Capital Management, LLC (focused) | 245.0k | 0.32% | $9.8M | trimmed -22.2% | 2020 Q3 |
| HRT Financial LP | 233.4k | 0.30% | $9.3M | trimmed -40.6% | 2025 Q2 |
| Gotham Asset Management | 217.8k | 0.28% | $8.7M | added +44.9% | 2024 Q2 |
| Whitebox Advisors LLC | 217.4k | 0.28% | $8.7M | added +71.8% | 2022 Q4 |
| Yakira Capital Management, INC. | 215.9k | 0.28% | $8.6M | added +6.5% | 2017 Q3 |
| Millennium Management | 214.2k | 0.28% | $8.6M | added +859.7% | ≤2013 |
Largest 50 of 323 shown; the full ranked, searchable register is at boothcheck.com/holders/IAC. 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.