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 | 60% | 62 | -2.1% | -4.4% |
| Loews Corporation | 53.8% | 48 | -7.3% | -9.6% |
| Berkshire Hathaway | 28.4% | 48 | +1.9% | -0.4% |
| Graham Holdings | 22.2% | 48 | -1.7% | -3.9% |
| Cincinnati Financial | 21.6% | 56 | +1.7% | -0.5% |
| Hingham Institution for Savings | 21.5% | 72 | -0.5% | -2.7% |
| White Mountains Insurance Group | 6.9% | 50 | -12.7% | -14.9% |
| W.R. Berkley | 4.1% | 48 | +2.8% | +0.6% |
| Alphabet | 2.1% | 55 | -11.8% | -14% |
| Nvidia | 1% | 48 | -13.7% | -15.9% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.