Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
900 institutional managers reported holding MKL for the quarter ended Mar 31, 2026. Together they hold about 76% of shares outstanding; the top 10 hold 35%. 93 opened new positions; 97 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 1.18M | 9.35% | $2.26B | added +0.7% | ≤2013 |
| BlackRock | 710.6k | 5.63% | $1.36B | unchanged | ≤2013 |
| Principal Financial Group INC | 402.4k | 3.19% | $770.0M | trimmed -24.6% | ≤2013 |
| Davis Selected Advisers | 383.4k | 3.04% | $733.7M | trimmed -7.6% | ≤2013 |
| Select Equity Group | 377.6k | 2.99% | $722.6M | trimmed -11.7% | 2025 Q1 |
| Morgan Stanley | 357.1k | 2.83% | $683.3M | trimmed -8.9% | ≤2013 |
| State Street | 307.0k | 2.43% | $587.4M | added +0.7% | ≤2013 |
| Boston Partners | 251.0k | 1.99% | $480.2M | trimmed -4.3% | 2020 Q1 |
| VAN Lanschot Kempen Investment Management N.v. | 226.1k | 1.79% | $432.7M | added +10.4% | 2023 Q1 |
| Geode Capital | 221.7k | 1.75% | $424.2M | trimmed -1.5% | ≤2013 |
| Davenport & CO LLC | 207.2k | 1.64% | $396.4M | trimmed -1.3% | ≤2013 |
| Baillie Gifford | 175.1k | 1.39% | $335.0M | trimmed -7.1% | ≤2013 |
| T. Rowe Price Investment Management, INC. | 155.4k | 1.23% | $297.3M | added +52.3% | 2023 Q1 |
| Dimensional Fund Advisors | 137.0k | 1.08% | $262.1M | added +4.9% | ≤2013 |
| Bank OF America CORP /DE/ | 136.1k | 1.08% | $260.4M | trimmed -7.6% | ≤2013 |
| UBS | 130.5k | 1.03% | $249.8M | added +19.4% | ≤2013 |
| Wellington Management | 106.7k | 0.84% | $204.1M | trimmed -4.7% | ≤2013 |
| Bank Julius Baer & CO. LTD, Zurich | 97.4k | 0.77% | $186.3M | trimmed -0.6% | 2021 Q1 |
| Madison Avenue Partners, LP (focused) | 87.9k | 0.70% | $168.2M | unchanged | 2025 Q1 |
| Fenimore Asset Management INC | 86.6k | 0.69% | $165.7M | trimmed -1.9% | ≤2013 |
| Northern Trust | 85.7k | 0.68% | $163.9M | added +1.2% | ≤2013 |
| Douglass Winthrop Advisors, LLC | 80.5k | 0.64% | $154.0M | trimmed -1.8% | ≤2013 |
| Polar Capital Holdings PLC | 80.0k | 0.63% | $153.1M | added +3.9% | ≤2013 |
| Fort Washington Investment Advisors INC /OH/ | 79.8k | 0.63% | $152.7M | unchanged | 2021 Q1 |
| Barr E S & CO | 77.2k | 0.61% | $147.8M | trimmed -1% | ≤2013 |
| Check Capital Management INC/CA (focused) | 76.9k | 0.61% | $147.1M | trimmed -0.6% | 2014 Q2 |
| JANA Partners (focused) | 75.3k | 0.60% | $144.1M | trimmed -7.3% | 2024 Q4 |
| Qube Research & Technologies LTD | 71.7k | 0.57% | $137.2M | added +284.8% | 2023 Q2 |
| Jennison Associates LLC | 71.4k | 0.57% | $136.7M | trimmed -2.4% | 2023 Q1 |
| Legal & General Group PLC | 70.7k | 0.56% | $135.3M | added +2.5% | ≤2013 |
| Davis Asset Management, L.p. | 70.6k | 0.56% | $135.2M | added +41.3% | 2022 Q3 |
| Charles Schwab Investment Management | 70.6k | 0.56% | $135.0M | added +4.7% | ≤2013 |
| Raymond James Financial INC | 67.9k | 0.54% | $129.9M | unchanged | 2013 Q4 |
| HighTower Advisors, LLC | 62.7k | 0.50% | $119.9M | trimmed -4.6% | 2015 Q2 |
| Scharf Investments, LLC | 61.1k | 0.48% | $117.0M | trimmed -11.6% | 2020 Q4 |
| Wells Fargo & COMPANY/MN | 59.1k | 0.47% | $113.1M | added +1.7% | ≤2013 |
| Epoch Investment Partners, INC. | 58.3k | 0.46% | $111.5M | trimmed -17.3% | 2022 Q4 |
| Graham Holdings CO Master Retirement Trust (focused) | 58.0k | 0.46% | $111.0M | unchanged | 2023 Q2 |
| Graham Holdings CO (focused) | 55.4k | 0.44% | $106.1M | unchanged | 2021 Q4 |
| Marshall Wace | 53.9k | 0.43% | $103.1M | added +183.7% | 2024 Q2 |
| Goldman Sachs | 49.3k | 0.39% | $94.3M | added +4% | ≤2013 |
| TD Asset Management INC | 49.1k | 0.39% | $93.9M | trimmed -12.5% | 2018 Q3 |
| Avenir CORP | 45.8k | 0.36% | $87.7M | trimmed -1.2% | ≤2013 |
| Giverny Capital INC. | 42.9k | 0.34% | $82.2M | trimmed -2.4% | 2015 Q1 |
| Steginsky Capital LLC (focused) | 42.9k | 0.34% | $82.0M | added +4.6% | 2016 Q4 |
| Royal Bank OF Canada | 42.7k | 0.34% | $81.8M | added +1.6% | ≤2013 |
| Quilter PLC | 38.7k | 0.31% | $74.0M | added +6.5% | 2023 Q1 |
| Envestnet Asset Management INC | 37.7k | 0.30% | $72.1M | trimmed -9.6% | ≤2013 |
| Swiss National Bank | 37.0k | 0.29% | $70.8M | added +6.7% | 2015 Q4 |
| BNY Mellon | 36.5k | 0.29% | $69.8M | trimmed -6.6% | ≤2013 |
Largest 50 of 900 shown; the full ranked, searchable register is at boothcheck.com/holders/MKL. 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.