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 | 59.4% | 53 | +0.5% | -3.3% |
| Loews Corporation | 56.1% | 39 | -1.3% | -5.1% |
| Berkshire Hathaway | 28.9% | 39 | +4.8% | +1% |
| Graham Holdings | 22.3% | 39 | -0.2% | -3.9% |
| Cincinnati Financial | 21% | 47 | +3.7% | -0.1% |
| Hingham Institution for Savings | 20.2% | 63 | +2% | -1.7% |
| White Mountains Insurance Group | 7.2% | 41 | -6.5% | -10.3% |
| W.R. Berkley | 4.2% | 39 | +6% | +2.3% |
| Alphabet | 2% | 46 | -11% | -14.8% |
| Nvidia | 1% | 39 | -12.7% | -16.5% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.