Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
1,334 institutional managers reported holding MCO for the quarter ended Mar 31, 2026. Together they hold about 90% of shares outstanding; the top 10 hold 51%. 137 opened new positions; 198 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Berkshire Hathaway (focused) | 24.67M | 13.91% | $10.77B | unchanged | ≤2013 |
| Vanguard Group | 15.36M | 8.67% | $6.71B | unchanged | ≤2013 |
| TCI Fund Management (focused) | 14.33M | 8.09% | $6.26B | added +7.7% | 2015 Q2 |
| BlackRock | 13.13M | 7.40% | $5.73B | trimmed -6.4% | ≤2013 |
| State Street | 7.14M | 4.03% | $3.12B | unchanged | ≤2013 |
| FMR (Fidelity) | 4.99M | 2.81% | $2.18B | trimmed -8.9% | ≤2013 |
| Geode Capital | 4.08M | 2.30% | $1.78B | added +2.9% | ≤2013 |
| Fiera Capital CORP | 2.36M | 1.33% | $1.03B | trimmed -0.7% | ≤2013 |
| PineStone Asset Management INC. (focused) | 2.35M | 1.32% | $1.03B | trimmed -1.1% | 2022 Q4 |
| BNY Mellon | 2.35M | 1.32% | $1.03B | added +3.2% | ≤2013 |
| Morgan Stanley | 2.32M | 1.31% | $1.01B | trimmed -2% | ≤2013 |
| Goldman Sachs | 2.16M | 1.22% | $941.7M | added +45.2% | ≤2013 |
| UBS | 1.98M | 1.11% | $862.6M | added +8.9% | ≤2013 |
| T. Rowe Price | 1.83M | 1.03% | $799.2M | added +6.7% | ≤2013 |
| Northern Trust | 1.75M | 0.99% | $765.2M | added +4% | ≤2013 |
| Egerton Capital (focused) | 1.55M | 0.87% | $674.8M | added +99.9% | 2025 Q4 |
| Windacre Partnership LLC (focused) | 1.33M | 0.75% | $581.9M | added +19.1% | 2022 Q3 |
| MFS Investment Management | 1.33M | 0.75% | $579.8M | added +1.3% | ≤2013 |
| Valley Forge Capital Management, LP (focused) | 1.32M | 0.74% | $575.0M | unchanged | 2016 Q4 |
| Akre Capital (focused) | 1.25M | 0.70% | $544.0M | trimmed -28.2% | ≤2013 |
| Charles Schwab Investment Management | 1.15M | 0.65% | $500.5M | added +3.2% | ≤2013 |
| Rothschild & CO Wealth Management UK LTD (focused) | 1.11M | 0.63% | $484.1M | trimmed -0.7% | 2017 Q3 |
| Principal Financial Group INC | 1.09M | 0.61% | $473.7M | added +72.1% | ≤2013 |
| Legal & General Group PLC | 1.04M | 0.59% | $456.1M | trimmed -13.1% | ≤2013 |
| Invesco | 1.03M | 0.58% | $449.3M | added +2% | ≤2013 |
| Schroder Investment Management Group | 890.7k | 0.50% | $388.8M | added +57.8% | 2017 Q1 |
| Dimensional Fund Advisors | 883.0k | 0.50% | $385.5M | added +7.2% | ≤2013 |
| Altarock Partners LP (focused) | 862.0k | 0.49% | $376.3M | added +5.8% | 2014 Q4 |
| Amundi | 843.0k | 0.47% | $368.0M | trimmed -7.1% | 2017 Q4 |
| Ninety One UK LTD | 840.3k | 0.47% | $366.8M | added +0.5% | ≤2013 |
| Royal Bank OF Canada | 786.9k | 0.44% | $343.6M | unchanged | ≤2013 |
| Baillie Gifford | 764.3k | 0.43% | $333.7M | added +11.2% | ≤2013 |
| Deutsche Bank AG\ | 746.9k | 0.42% | $326.1M | added +6.5% | 2013 Q3 |
| Barclays PLC | 709.8k | 0.40% | $309.9M | trimmed -38.3% | ≤2013 |
| Longview Partners (Guernsey) LTD (focused) | 709.6k | 0.40% | $309.8M | trimmed -26.6% | 2022 Q1 |
| Allen Investment Management, LLC | 701.8k | 0.40% | $306.4M | trimmed -2.5% | 2013 Q4 |
| APG Asset Management N.v. | 684.1k | 0.39% | $298.7M | added +20.2% | ≤2013 |
| Neuberger Berman Group LLC | 680.9k | 0.38% | $297.3M | added +2.6% | ≤2013 |
| Bank OF America CORP /DE/ | 671.9k | 0.38% | $293.3M | trimmed -15.2% | ≤2013 |
| Nuveen | 659.9k | 0.37% | $288.1M | trimmed -7% | ≤2013 |
| Stifel Financial CORP | 655.9k | 0.37% | $286.4M | trimmed -2.6% | 2014 Q3 |
| BNP Paribas Financial Markets | 645.6k | 0.36% | $281.9M | added +91.1% | ≤2013 |
| Russell Investments Group, LTD. | 614.4k | 0.35% | $268.2M | added +7% | 2016 Q4 |
| Nordea Investment Management AB | 558.3k | 0.32% | $243.7M | added +1% | ≤2013 |
| Marshfield Associates (focused) | 539.0k | 0.30% | $235.3M | trimmed -4.4% | ≤2013 |
| BLS Capital Fondsmaeglerselskab A/S (focused) | 518.2k | 0.29% | $226.2M | added +91.9% | 2016 Q1 |
| Mitsubishi UFJ Asset Management CO., LTD. | 515.8k | 0.29% | $225.2M | unchanged | ≤2013 |
| AKO Capital LLP (focused) | 510.8k | 0.29% | $223.0M | trimmed -30.6% | 2016 Q4 |
| National Pension Service | 499.3k | 0.28% | $218.0M | trimmed -2.9% | 2014 Q3 |
| Hsbc Holdings PLC | 459.6k | 0.26% | $200.6M | added +1.7% | ≤2013 |
Largest 50 of 1,334 shown; the full ranked, searchable register is at boothcheck.com/holders/MCO. 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.