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 | 56.4% | 46 | +9.1% | -3.9% |
| Loews Corporation | 52.5% | 32 | -1.4% | -14.4% |
| Berkshire Hathaway | 26.8% | 32 | +8.7% | -4.3% |
| Cincinnati Financial | 21.2% | 36 | +11.5% | -1.5% |
| Graham Holdings | 20.7% | 32 | +9.5% | -3.5% |
| Hingham Institution for Savings | 13.7% | 62 | +10.5% | -2.5% |
| White Mountains Insurance Group | 6.9% | 35 | +9.7% | -3.3% |
| W.R. Berkley | 3.1% | 32 | +3.7% | -9.3% |
| Nvidia | 0.8% | 32 | +114.7% | +101.6% |
| Alphabet | 0.1% | 39 | +18.3% | +5.3% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.