ETF exposure
Sprint 56All ETFs holding this ticker — weight, shares, and flow-of-funds impact.
Citable ownership snapshot
MCO's latest 13F holder table lists Berkshire Hathaway as the largest holder in this view with 24,669,778 shares valued at $10.76B.
| Holder | Report date | Value | Portfolio weight |
|---|---|---|---|
| Berkshire Hathaway | Mar 31, 2026 | $10.76B | 4.1% |
| TCI Fund Management | Mar 31, 2026 | $6.25B | 13.8% |
| Valley Forge Capital | Mar 31, 2026 | $574.62M | 17.0% |
| AQR Capital Management | Mar 31, 2026 | $196.79M | 0.1% |
| Citadel Advisors | Mar 31, 2026 | $110.20M | 0.0% |
| D.E. Shaw & Co. | Mar 31, 2026 | $108.38M | 0.1% |
| Renaissance Technologies | Mar 31, 2026 | $48.89M | 0.1% |
| Coatue Management | Dec 31, 2025 | $32.83M | 0.1% |
Source: SEC EDGAR 13F filings; period Mar 31, 2026; filed May 15, 2026.
Continue research
Follow same-sector companies and source explainers connected to the ownership view.
A factual guide to 13F filings, what they show, what they omit, and how Aerarium Research turns them into holder and overlap views.
A factual guide to Schedule 13D and 13G beneficial ownership reports for holders with more than 5% stakes.
A factual guide to definitive proxy statements, shareholder voting matters, board information, and executive compensation disclosures.
A factual guide to Form 4 — who must file, what insider buys and sells disclose, and why a single transaction rarely explains itself.