HoldcoTracker marks the reported 13-F equity portfolios of operating and holding companies to last close. Institutional investors with over $100 million in U.S. equities file 13-Fs disclosing those holdings within 45 days of each quarter-end; the lead column below sizes each filer's equity book against the parent company's market cap.
| Company | 13-F as % of Mkt Cap | Days Since Filing | Since Filing | vs S&P since filing |
|---|---|---|---|---|
| Markel Group | 58.8% | 75 | +0.3% | -4% |
| Loews Corporation | 54% | 61 | -3.4% | -7.7% |
| Berkshire Hathaway | 28% | 61 | +5% | +0.6% |
| Graham Holdings | 22.2% | 61 | +1.9% | -2.4% |
| Hingham Institution for Savings | 22.1% | 85 | +4.9% | +0.6% |
| Cincinnati Financial | 21.5% | 69 | +5.4% | +1.1% |
| White Mountains Insurance Group | 7% | 63 | -7.7% | -12% |
| W.R. Berkley | 3.9% | 61 | +6.4% | +2.1% |
| Alphabet | 2.1% | 68 | -8.8% | -13.1% |
| Nvidia | 0.9% | 61 | -18.8% | -23.1% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.