Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
667 institutional managers reported holding MOS for the quarter ended Mar 31, 2026. Together they hold about 88% of shares outstanding; the top 10 hold 51%. 134 opened new positions; 105 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 38.87M | 12.24% | $990.8M | trimmed -0.8% | ≤2013 |
| FMR (Fidelity) | 29.08M | 9.16% | $741.2M | trimmed -27.4% | ≤2013 |
| BlackRock | 23.65M | 7.45% | $602.8M | trimmed -2.7% | ≤2013 |
| Dimensional Fund Advisors | 14.24M | 4.49% | $363.0M | added +6.2% | ≤2013 |
| State Street | 13.41M | 4.22% | $341.8M | added +1.8% | ≤2013 |
| Invesco | 11.24M | 3.54% | $286.4M | trimmed -5.1% | ≤2013 |
| AQR Capital | 10.92M | 3.44% | $278.5M | added +40.8% | 2018 Q4 |
| Geode Capital | 8.75M | 2.76% | $223.1M | added +3.2% | ≤2013 |
| Goldman Sachs | 6.79M | 2.14% | $173.0M | added +18.3% | ≤2013 |
| T. Rowe Price | 5.49M | 1.73% | $140.1M | added +255.9% | ≤2013 |
| Northern Trust | 5.17M | 1.63% | $131.8M | added +7% | ≤2013 |
| Morgan Stanley | 4.91M | 1.55% | $125.1M | trimmed -1% | ≤2013 |
| Donald Smith & CO., INC. | 4.62M | 1.45% | $117.7M | unchanged | 2019 Q4 |
| BNY Mellon | 4.14M | 1.30% | $105.4M | added +0.6% | ≤2013 |
| Charles Schwab Investment Management | 3.90M | 1.23% | $99.4M | added +2.8% | ≤2013 |
| Arrowstreet Capital | 3.24M | 1.02% | $82.6M | added +252.2% | 2025 Q1 |
| Citadel Advisors | 3.07M | 0.97% | $78.2M | added +42.2% | 2016 Q3 |
| Thompson Siegel & Walmsley LLC | 3.04M | 0.96% | $77.4M | added +2% | 2017 Q1 |
| Deutsche Bank AG\ | 2.86M | 0.90% | $72.9M | added +15.7% | ≤2013 |
| UBS | 2.83M | 0.89% | $72.1M | trimmed -11.8% | ≤2013 |
| Wellington Management | 2.53M | 0.80% | $64.6M | added +75.5% | ≤2013 |
| Bank OF America CORP /DE/ | 2.49M | 0.78% | $63.4M | added +7.4% | ≤2013 |
| Allianz Asset Management GmbH | 2.38M | 0.75% | $60.6M | added +1.8% | 2021 Q1 |
| DNB Asset Management AS | 2.25M | 0.71% | $57.5M | opened | 2026 Q1 |
| Victory Capital Management INC | 2.11M | 0.67% | $53.8M | trimmed -22.7% | 2015 Q2 |
| Marshall Wace | 2.09M | 0.66% | $53.2M | opened | 2026 Q1 |
| Raymond James Financial INC | 1.66M | 0.52% | $42.4M | added +21.3% | ≤2013 |
| BNP Paribas Financial Markets | 1.65M | 0.52% | $42.2M | added +18.1% | ≤2013 |
| VAN ECK Associates CORP | 1.57M | 0.49% | $40.0M | added +25.5% | ≤2013 |
| LSV Asset Management | 1.55M | 0.49% | $39.5M | trimmed -3.1% | 2021 Q2 |
| Amundi | 1.50M | 0.47% | $38.2M | added +2.5% | 2017 Q4 |
| Squarepoint Ops LLC | 1.43M | 0.45% | $36.4M | trimmed -60.8% | 2018 Q4 |
| Randolph CO INC (focused) | 1.38M | 0.43% | $35.2M | unchanged | 2025 Q4 |
| Nuveen | 1.26M | 0.40% | $32.2M | trimmed -8.4% | 2018 Q1 |
| Caisse de depot et placement du Quebec | 1.20M | 0.38% | $30.5M | trimmed -40.7% | ≤2013 |
| Barclays PLC | 1.08M | 0.34% | $27.4M | added +1.8% | ≤2013 |
| Storebrand Asset Management AS | 1.00M | 0.32% | $25.5M | trimmed -1.5% | 2025 Q4 |
| S&co INC | 963.7k | 0.30% | $24.6M | trimmed -1% | 2013 Q3 |
| Wells Fargo & COMPANY/MN | 952.7k | 0.30% | $24.3M | added +140.2% | ≤2013 |
| First Trust Advisors LP | 949.2k | 0.30% | $24.2M | added +77.2% | ≤2013 |
| Goehring & Rozencwajg Associates, LLC (focused) | 922.3k | 0.29% | $23.5M | added +104.5% | 2022 Q4 |
| Aegis Financial CORP (focused) | 853.6k | 0.27% | $21.8M | unchanged | 2025 Q4 |
| Terril Brothers, INC. | 772.6k | 0.24% | $19.7M | added +1.4% | 2021 Q3 |
| HRT Financial LP | 751.3k | 0.24% | $19.2M | trimmed -28.6% | 2022 Q2 |
| Russell Investments Group, LTD. | 744.1k | 0.23% | $19.0M | trimmed -27.3% | 2016 Q4 |
| Managed Asset Portfolios, LLC | 728.2k | 0.23% | $18.6M | added +3.9% | 2017 Q2 |
| Ceredex Value Advisors LLC | 712.2k | 0.22% | $18.2M | trimmed -2.9% | 2025 Q4 |
| Susquehanna Portfolio Strategies, LLC | 694.2k | 0.22% | $17.7M | opened | 2026 Q1 |
| Foundation Resource Management INC | 683.7k | 0.21% | $17.4M | added +5% | 2016 Q3 |
| Susquehanna International Group | 667.7k | 0.21% | $17.0M | trimmed -29.5% | ≤2013 |
Largest 50 of 667 shown; the full ranked, searchable register is at boothcheck.com/holders/MOS. 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.