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 |
|---|---|---|---|---|
| Loews Corporation | 53.9% | 47 | +5.9% | -8.2% |
| Markel Group | 53.4% | 61 | +9.4% | -4.7% |
| Berkshire Hathaway | 26.3% | 47 | +8% | -6% |
| Graham Holdings | 21.4% | 47 | +10.4% | -3.7% |
| Cincinnati Financial | 18.2% | 51 | +5.3% | -8.8% |
| Hingham Institution for Savings | 13.5% | 77 | +13.9% | -0.1% |
| White Mountains Insurance Group | 7.7% | 50 | +25.6% | +11.6% |
| W.R. Berkley | 3% | 47 | +1.9% | -12.1% |
| Nvidia | 0.9% | 47 | +131.1% | +117.1% |
| Alphabet | 0.1% | 54 | +19.5% | +5.4% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.