Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
590 institutional managers reported holding MGM for the quarter ended Mar 31, 2026. Together they hold about 65% of shares outstanding; the top 10 hold 38%. 83 opened new positions; 87 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Davis Selected Advisers | 24.30M | 9.38% | $898.7M | trimmed -9.4% | 2023 Q3 |
| Vanguard Group | 22.15M | 8.55% | $819.2M | trimmed -7% | ≤2013 |
| BlackRock | 12.91M | 4.99% | $477.6M | trimmed -2.5% | ≤2013 |
| State Street | 6.99M | 2.70% | $258.6M | trimmed -7% | ≤2013 |
| Invesco | 6.66M | 2.57% | $246.3M | added +13.9% | ≤2013 |
| Corvex Management LP (focused) | 5.35M | 2.07% | $197.8M | trimmed -0.7% | 2018 Q2 |
| Geode Capital | 5.09M | 1.97% | $188.2M | trimmed -2.6% | ≤2013 |
| Morgan Stanley | 4.93M | 1.91% | $182.5M | trimmed -4.3% | ≤2013 |
| Goldentree Asset Management LP (focused) | 4.77M | 1.84% | $176.5M | added +0.8% | 2024 Q1 |
| Point72 | 4.26M | 1.65% | $157.7M | opened | 2026 Q1 |
| Goldman Sachs | 3.23M | 1.25% | $119.6M | added +48.6% | ≤2013 |
| AQR Capital | 3.18M | 1.23% | $117.8M | trimmed -56.7% | ≤2013 |
| Helikon Investments LTD (focused) | 2.88M | 1.11% | $106.3M | trimmed -3.8% | 2025 Q1 |
| LSV Asset Management | 2.49M | 0.96% | $91.9M | trimmed -5.5% | 2024 Q2 |
| Dimensional Fund Advisors | 2.38M | 0.92% | $88.0M | added +1.6% | ≤2013 |
| Arrowstreet Capital | 2.17M | 0.84% | $80.4M | trimmed -69.4% | 2024 Q3 |
| Suvretta Capital Management, LLC | 2.16M | 0.83% | $79.9M | added +79.6% | 2025 Q4 |
| Bank OF America CORP /DE/ | 2.09M | 0.81% | $77.4M | trimmed -27.3% | ≤2013 |
| Charles Schwab Investment Management | 2.07M | 0.80% | $76.7M | trimmed -1% | ≤2013 |
| Northern Trust | 1.93M | 0.75% | $71.4M | trimmed -1.3% | ≤2013 |
| UBS | 1.85M | 0.71% | $68.2M | trimmed -16.7% | ≤2013 |
| Wells Fargo & COMPANY/MN | 1.78M | 0.69% | $65.8M | trimmed -19.8% | ≤2013 |
| Southeastern Asset Management INC/TN/ (focused) | 1.66M | 0.64% | $61.5M | trimmed -18.2% | 2020 Q3 |
| BNY Mellon | 1.55M | 0.60% | $57.4M | added +1.5% | ≤2013 |
| FMR (Fidelity) | 1.17M | 0.45% | $43.2M | trimmed -14.6% | 2013 Q4 |
| Royal Bank OF Canada | 1.11M | 0.43% | $41.1M | added +1% | ≤2013 |
| Deutsche Bank AG\ | 1.08M | 0.42% | $39.8M | added +21.6% | ≤2013 |
| Bamco INC /NY/ | 996.5k | 0.39% | $36.9M | opened | 2026 Q1 |
| Allianz Asset Management GmbH | 988.6k | 0.38% | $36.6M | trimmed -5.5% | 2013 Q4 |
| Connor, Clark & Lunn Investment Management LTD. | 946.8k | 0.37% | $35.0M | added +28.2% | 2025 Q2 |
| Mudita Advisors LLP (focused) | 945.9k | 0.36% | $35.0M | added +9.9% | 2025 Q2 |
| Two Sigma | 904.8k | 0.35% | $33.5M | added +136.8% | 2025 Q3 |
| ArrowMark Colorado Holdings LLC | 851.8k | 0.33% | $31.5M | trimmed -41.2% | 2021 Q3 |
| Raymond James Financial INC | 832.3k | 0.32% | $30.8M | trimmed -0.7% | ≤2013 |
| Interval Partners, LP | 788.2k | 0.30% | $29.2M | opened | 2026 Q1 |
| Hosking Partners LLP | 733.9k | 0.28% | $27.1M | added +0.6% | 2015 Q3 |
| Amundi | 721.5k | 0.28% | $26.7M | added +7.9% | 2015 Q2 |
| Teachers Retirement System OF THE State OF Kentucky | 701.2k | 0.27% | $25.9M | trimmed -3.1% | 2017 Q3 |
| Todd Asset Management LLC | 684.6k | 0.26% | $25.3M | trimmed -3.5% | 2025 Q2 |
| Barclays PLC | 586.2k | 0.23% | $21.7M | added +15.2% | ≤2013 |
| Jane Street | 559.0k | 0.22% | $20.7M | added +2754.1% | 2014 Q1 |
| GMT Capital CORP | 525.7k | 0.20% | $19.4M | trimmed -32.6% | 2025 Q1 |
| Envestnet Asset Management INC | 489.6k | 0.19% | $18.1M | added +3.1% | ≤2013 |
| BNP Paribas Financial Markets | 485.5k | 0.19% | $18.0M | trimmed -70.5% | ≤2013 |
| Artisan Partners | 472.2k | 0.18% | $17.5M | trimmed -10.2% | 2024 Q3 |
| Clough Capital Partners L P | 428.4k | 0.17% | $15.8M | opened | 2026 Q1 |
| CalPERS | 424.5k | 0.16% | $15.7M | added +6.3% | ≤2013 |
| Nuveen | 420.6k | 0.16% | $15.6M | added +4.5% | 2014 Q3 |
| Nokomis Capital, L.l.c. (focused) | 419.3k | 0.16% | $15.5M | trimmed -35.3% | 2024 Q3 |
| Swiss National Bank | 405.9k | 0.16% | $15.0M | added +0.8% | ≤2013 |
Largest 50 of 590 shown; the full ranked, searchable register is at boothcheck.com/holders/MGM. 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.