⚠ The Pool Can Stall or ShrinkLow threat
Berkshire Hathaway (BRK.B) — threat to the moat
Float grows only when there's profitable risk worth writing.
The float's growth is not guaranteed, and at Berkshire's scale it has become genuinely hard to move. To grow the pool meaningfully now requires writing tens of billions of dollars of new, sensibly priced risk — and in soft markets, when capital is abundant and prices are poor, that business simply does not exist at rates a disciplined underwriter will accept. In those years the float stalls, and it can even shrink as old policies run off faster than profitable new ones replace them.
There is a deeper, slower worry too. GEICO, long the organic engine of float growth, has faced sharper competition and had to work hard to keep pace with rivals who moved faster on telematics and pricing technology. If the auto-insurance business matures or loses share, one of the pool's most reliable sources of expansion weakens, and the burden of growth falls on lumpier, less predictable reinsurance and large-risk deals.
This caps how much the engine can contribute rather than threatening it. A flat float still throws off free leverage on an enormous base, and Berkshire has always preferred a stagnant, profitable pool to a growing, unprofitable one. But an owner expecting the float to keep compounding as it did in leaner decades should temper that expectation: at this size, and with this discipline, holding the pool profitable matters far more than growing it, and growth will come in fits rather than a steady climb — as the recent path already shows: $164 billion in 2022, $169 billion in 2023, $171 billion in 2024 and $176 billion in 2025.12
- ReportedBut an owner expecting the float to keep compounding as it did in leaner decades should temper that expectation: at this size, and with this discipline, holding the pool profitable matters far more than growing it, and growth will come in fits rather than a steady climb — as the recent path already shows: $164 billion in 2022, $169 billion in 2023, $171 billion in 2024 and $176 billion in 2025.Berkshire Hathaway Form 10-K, FY2024 - float $171 billion (2024), $169 billion (2023) and $164 billion (2022); after-tax earnings by line 2022-2024 (insurance investment income $13,670M in 2024, net earnings $88,995M, investment gains $41,558M); $2.9 billion of share repurchases in 2024 and $9.2 billion in 2023; about 392,400 employees — FY2022-FY2024 · publ. February 2025 · source ↗
- ReportedBut an owner expecting the float to keep compounding as it did in leaner decades should temper that expectation: at this size, and with this discipline, holding the pool profitable matters far more than growing it, and growth will come in fits rather than a steady climb — as the recent path already shows: $164 billion in 2022, $169 billion in 2023, $171 billion in 2024 and $176 billion in 2025.Berkshire Hathaway Form 10-K, FY2025 - float $176 billion; after-tax earnings 2023-2025 (underwriting $7,258M, insurance investment income $12,513M, BNSF $5,476M, BHE $3,979M, manufacturing, service and retailing $13,647M in 2025; net earnings $66,968M incl. $30,737M investment gains and an $8,255M Kraft Heinz/Occidental impairment); revenues $371,444M; segment revenues (insurance $104,212M incl. premiums earned $88,902M and investment income $15,310M, BNSF $23,533M, BHE $26,297M, manufacturing $78,487M, service and retailing $42,647M, McLane $50,998M, Pilot $42,198M); pre-tax underwriting GEICO $6,824M, Primary $785M, Reinsurance $1,851M; GEICO combined ratio 84.7% (81.5%, 90.7%) and loss ratio 72.3%; capex $20,927M and D&A by segment; identifiable assets and goodwill by segment; 65% of equity fair value in five companies; equity securities $297.8B ($271.6B); BNSF volumes by business group; no share repurchases in 2025; no cash dividend since 1967; about 387,800 employees — FY2023-FY2025 · publ. March 2026 · source ↗