Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,490 institutional managers reported holding MRSH for the quarter ended Mar 31, 2026. Together they hold about 89% of shares outstanding; the top 10 hold 43%. 126 opened new positions; 193 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 49.02M | 10.09% | $8.50B | added +5.1% | ≤2013 |
| BlackRock | 42.06M | 8.65% | $7.29B | added +4% | ≤2013 |
| State Street | 22.07M | 4.54% | $3.83B | added +0.9% | ≤2013 |
| Capital Group (American Funds) | 17.97M | 3.70% | $3.11B | added +6.2% | ≤2013 |
| Wellington Management | 17.37M | 3.57% | $3.01B | added +8.6% | ≤2013 |
| Capital International Investors | 15.71M | 3.23% | $2.72B | trimmed -16.3% | ≤2013 |
| Geode Capital | 13.40M | 2.76% | $2.32B | added +15.1% | ≤2013 |
| Capital Research Global Investors | 11.30M | 2.33% | $1.96B | added +41.5% | ≤2013 |
| T. Rowe Price | 10.98M | 2.26% | $1.90B | added +19.1% | ≤2013 |
| FMR (Fidelity) | 10.18M | 2.10% | $1.76B | trimmed -33.1% | ≤2013 |
| UBS | 9.90M | 2.04% | $1.72B | added +18.8% | ≤2013 |
| MFS Investment Management | 8.20M | 1.69% | $1.42B | trimmed -5.3% | 2019 Q2 |
| Morgan Stanley | 6.47M | 1.33% | $1.12B | trimmed -5.8% | ≤2013 |
| Clearbridge Investments, LLC | 6.42M | 1.32% | $1.11B | added +26.5% | ≤2013 |
| Ameriprise Financial INC | 5.49M | 1.13% | $951.3M | added +14.6% | ≤2013 |
| Harris Associates (Oakmark) | 5.17M | 1.06% | $896.0M | opened | 2026 Q1 |
| Northern Trust | 4.97M | 1.02% | $860.6M | trimmed -6.3% | ≤2013 |
| Bank OF America CORP /DE/ | 4.94M | 1.02% | $856.2M | trimmed -10.6% | ≤2013 |
| Artisan Partners | 4.88M | 1.00% | $845.1M | added +45.2% | ≤2013 |
| American Century Companies INC | 4.23M | 0.87% | $733.9M | added +81.7% | ≤2013 |
| Nuveen | 4.17M | 0.86% | $722.4M | added +8% | ≤2013 |
| Ninety One UK LTD | 4.03M | 0.83% | $698.4M | added +13.8% | ≤2013 |
| Invesco | 3.88M | 0.80% | $673.3M | added +12.2% | ≤2013 |
| Deutsche Bank AG\ | 3.70M | 0.76% | $642.0M | added +10% | 2013 Q3 |
| AQR Capital | 3.67M | 0.76% | $636.8M | added +148.6% | ≤2013 |
| Goldman Sachs | 3.67M | 0.76% | $636.6M | trimmed -8.5% | ≤2013 |
| Mawer Investment Management LTD. | 3.48M | 0.71% | $602.4M | trimmed -11% | ≤2013 |
| Arrowstreet Capital | 3.45M | 0.71% | $598.8M | added +25.3% | 2023 Q1 |
| Royal Bank OF Canada | 3.32M | 0.68% | $574.9M | added +4.7% | ≤2013 |
| BNY Mellon | 3.25M | 0.67% | $564.0M | trimmed -2% | ≤2013 |
| Legal & General Group PLC | 3.07M | 0.63% | $531.5M | trimmed -2.5% | ≤2013 |
| Charles Schwab Investment Management | 3.03M | 0.62% | $525.7M | added +2.8% | ≤2013 |
| BNP Paribas Financial Markets | 2.94M | 0.60% | $509.9M | added +53.9% | ≤2013 |
| Wells Fargo & COMPANY/MN | 2.58M | 0.53% | $447.0M | added +5.5% | ≤2013 |
| Stifel Financial CORP | 2.31M | 0.47% | $399.9M | added +6.9% | ≤2013 |
| Amundi | 2.30M | 0.47% | $398.5M | trimmed -31.7% | 2017 Q1 |
| Parnassus Investments | 2.21M | 0.46% | $383.1M | added +1.7% | 2022 Q2 |
| Dimensional Fund Advisors | 2.03M | 0.42% | $352.5M | unchanged | ≤2013 |
| London & Capital Asset Management LTD | 2.02M | 0.42% | $350.8M | added +6.5% | 2025 Q1 |
| AllianceBernstein | 1.98M | 0.41% | $343.4M | added +7.7% | ≤2013 |
| D. E. Shaw | 1.73M | 0.36% | $299.8M | trimmed -33.4% | 2021 Q4 |
| Navera Investment Management LTD. | 1.68M | 0.35% | $291.3M | trimmed -4.2% | 2020 Q4 |
| Lazard Asset Management LLC | 1.62M | 0.33% | $281.4M | trimmed -5% | 2014 Q3 |
| Manufacturers Life Insurance Company, THE | 1.57M | 0.32% | $272.6M | added +3.1% | ≤2013 |
| Franklin Resources | 1.54M | 0.32% | $266.6M | trimmed -1.1% | ≤2013 |
| Mitsubishi UFJ Asset Management CO., LTD. | 1.49M | 0.31% | $257.9M | added +5.5% | ≤2013 |
| Swiss National Bank | 1.44M | 0.30% | $249.2M | added +6.6% | ≤2013 |
| Barclays PLC | 1.38M | 0.28% | $238.4M | trimmed -5.9% | ≤2013 |
| Rathbones Group PLC | 1.36M | 0.28% | $235.2M | added +1.9% | ≤2013 |
| Canada Life Assurance CO | 1.34M | 0.28% | $231.8M | added +1.6% | ≤2013 |
Largest 50 of 1,490 shown; the full ranked, searchable register is at boothcheck.com/holders/MRSH. 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.