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 | 57.1% | 78 | +0.7% | -1.6% |
| Loews Corporation | 54.3% | 64 | -1% | -3.4% |
| Berkshire Hathaway | 27.6% | 64 | +5.7% | +3.3% |
| Hingham Institution for Savings | 21.9% | 88 | +5.2% | +2.9% |
| Graham Holdings | 21.6% | 64 | +1.6% | -0.8% |
| Cincinnati Financial | 20.9% | 72 | +6.1% | +3.7% |
| White Mountains Insurance Group | 7.1% | 66 | -3.9% | -6.3% |
| W.R. Berkley | 3.8% | 64 | +5.4% | +3.1% |
| Alphabet | 2% | 71 | -14.8% | -17.2% |
| Nvidia | 0.9% | 64 | -27.7% | -30.1% |
Data updates nightly after U.S. market close. 13-F positions reflect last quarterly filing; prices marked to most recent close.