Catastrophe CapacityNarrow moat

Berkshire Hathaway (BRK.B) — moat facet

A balance sheet big enough to insure what no one else will touch — and priced accordingly.

Berkshire's balance sheet lets it do something almost no other insurer can: cheerfully insure the enormous, lumpy catastrophes that would bankrupt a smaller company if they went wrong. A single hurricane or earthquake can produce claims in the tens of billions, and most insurers must cap their exposure to survive a bad year. Berkshire, with its fortress reserves and diversified earnings, can absorb a loss that would destroy a competitor — and so it can write the coverage others cannot.

Five straight losing years, then four profitable ones: the lumpy book that only a fortress can write.

That capacity is a genuine competitive advantage because it lets Berkshire charge handsomely for bearing risk no one else will take, and to be greedy for such business precisely when a disaster has frightened everyone else out of the market. After a mega-catastrophe, when reinsurance prices spike and timid capital flees, Berkshire can step forward and write large volumes at attractive rates. Its willingness to lose a great deal in a single bad year, in exchange for profiting handsomely across many, is a form of courage underwritten by the strength of the whole enterprise.

The risk is inherent and worth naming: catastrophe cover produces volatile, occasionally huge losses, and a truly unprecedented event could deliver a loss even Berkshire would feel. Berkshire manages this by pricing conservatively and keeping its exposures within what the balance sheet can bear, but the capacity to insure the un-insurable is, by its nature, the capacity to lose spectacularly in a single year — a bargain only an enterprise this strong — $365.5 billion of cash and Treasury bills at the end of June 2026 strong¹² — can afford to make.

Moat trajectory: Holding steady

Holding steady. Berkshire's ability to insure the catastrophes others can't rests on the strength of its balance sheet, and that strength is intact — indeed, with record capital behind it, the capacity to bear enormous risk has never been greater. What keeps this from widening is the other side of the ledger: a warming climate is making the largest catastrophes harder to price and potentially larger, raising the stakes on the bet. Capacity and risk are rising together, leaving the advantage durable and roughly stable.

The number that tests this moat

Reported

Reinsurance pre-tax underwriting earnings, first half

$1,286M in H1 2026, from $343M

BHRG writes the large-risk and catastrophe book. A quiet half flatters it; the test is a large-loss year, when this line should fall without the float shrinking.

Source: Berkshire Form 10-Q, quarter ended 30 June 2026 ↗

⚠ Threats to the moat

⚠ THREAT 01

The Unprecedented Year

The loss bigger than the models is the business's defining risk — and climate keeps raising the odds.

References

ReportedBerkshire manages this by pricing conservatively and keeping its exposures within what the balance sheet can bear, but the capacity to insure the un-insurable is, by its nature, the capacity to lose spectacularly in a single year — a bargain only an enterprise this strong — $365.5 billion of cash and Treasury bills at the end of June 2026 strong — can afford to make.
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 ↗
Moat Explorer calcBerkshire manages this by pricing conservatively and keeping its exposures within what the balance sheet can bear, but the capacity to insure the un-insurable is, by its nature, the capacity to lose spectacularly in a single year — a bargain only an enterprise this strong — $365.5 billion of cash and Treasury bills at the end of June 2026 strong — can afford to make.
Moat Explorer calculation from Berkshire's Forms 10-K FY2016-FY2025 and 10-Qs for Q1 and Q2 2026: operating earnings = net earnings less after-tax investment gains and the 2025 impairments (FY2023 $37,350M, FY2024 $47,437M, FY2025 $44,486M; Q2 2026 $12,983M vs $11,160M; H1 2026 $24,329M vs $20,801M); consolidated cash and Treasury Bills $397.4B (31 March 2026) and $365.5B (30 June 2026); underwriting as a share of float; OxyChem at 2.6% of the cash pile; five-line after-tax earnings sums — 2016 to Q2 2026 · publ. 2026-09-23 · source ↗

Sources

Generated September 23, 2026