The Policyholders Who Fund EverythingWide moat

Berkshire Hathaway (BRK.B) — moat facet

Customers who hand over $177.5 billion years before it is owed, and who — if the underwriting is good — pay for the privilege.

Insurance customers occupy the strangest position in this company. They pay premiums today for claims that may be settled years or decades from now, and in the interval Berkshire invests the money and keeps the returns. That pool was $177.5 billion at the end of June 2026,1 and it is the single most important asset Berkshire owns that does not appear as one.

Insurance premiums earned by unit, 2025 ($B)GEICO$44.5BReinsurance Group$25.7BPrimary Group$18.7B$88.9B in total; Berkshire Form 10-K FY2025, segment data
Half the premiums come from auto drivers, who fund the float a policy at a time.

The reason this is better than borrowing is the cost. A lender charges interest; a policyholder, if the insurance is underwritten well, effectively pays Berkshire to hold the money, because premiums collected exceed claims and expenses. Berkshire has achieved that across most of its history. The customer relationship is therefore inverted: these are customers who provide capital rather than consume it.

The risk is that they can also destroy it. Underwriting badly to grow float turns a free loan into an expensive one, which is the mistake most insurers eventually make and the discipline the moat pages describe Berkshire resisting. Catastrophe exposure means a single year can consume a decade of underwriting profit.

Watch the cost of float — whether underwriting produces a profit or a loss across a full cycle. Float that grows while underwriting loses money is not an asset being built; it is leverage being taken on, and it looks identical from outside until a bad year arrives.

Moat trajectory: Holding steady

Float reached $177.5 billion in June 2026, up about $1 billion in six months, and underwriting stayed profitable. GEICO's combined ratio rising to 91.2% from 83.5% is the one strain; the usual way to grow float quickly is to underwrite badly, and Berkshire has not.

The number that tests this moat
Reported
Investment income earned on the float, latest quarter
$3,059M after tax in Q2 2026, from $3,367M

Down 9.1% on lower interest rates. The policyholders' money earns what Treasury bills pay.

Source: Berkshire Form 10-Q, quarter ended 30 June 2026 ↗
References
  1. ReportedThat pool was $177.5 billion at the end of June 2026, and it is the single most important asset Berkshire owns that does not appear as one.
    Berkshire Hathaway Form 10-Q, quarter ended 30 June 2026 - after-tax earnings (underwriting $1,731M vs $1,992M, insurance investment income $3,059M vs $3,367M, BNSF $1,558M vs $1,466M, BHE $891M vs $702M, manufacturing, service and retailing $4,470M vs $3,601M, investment gains $12,684M, net earnings $25,667M); GEICO pre-tax underwriting $994M vs $1,821M, combined ratio 91.2% vs 83.5%; Reinsurance $913M vs $650M; float $177.5B; insurance and other cash and Treasury Bills net $359.2B; consolidated cash $35,096M + $324,905M + $5,513M; equity securities $323.8B; H1 purchases of equities $39.4B and sales $27.8B; acquisitions of businesses net of cash $9.7B; $4.8B of treasury stock acquired in H1, most in Q2; OxyChem about $9.4B on 2 January; Taylor Morrison agreed 31 May at $72.50 a share, about $6.8B, closed 24 July; notes payable of insurance and other $43.3B; shareholders' equity $747.9B; BNSF revenue $6,601M vs $5,769M, fuel $1,173M vs $698M; BHE revenue $6,735M vs $6,418M; investment income down 9.1% on lower interest rates — Q2 2026 · publ. August 2026 · source ↗
Sources
Generated September 23, 2026