# $BRK.B: defensive by cash, cyclical by business
Latent Equity · published Oct 19, 2026 · Macro history
Post: https://x.com/Latent_Equity/status/2112198201688150425

Our read: $BRK.B trades like a safe haven, but most of what Berkshire owns still rises and falls with the economy. It's defensive by cash, cyclical by business.

How it trades: in the risk-off week of Oct 9–16, $BRK.B rose 3.2% while $SPY fell 2.0% (our calc). Consumer staples ($XLP) did even better, at +5.0%. Its 1-year beta – how much a stock tends to move when the market moves – is −0.03, about zero (our calc, daily closes). As recently as January it was 0.47.

What it owns: we split Berkshire's enterprise value (market cap plus debt and deferred tax) into defensive and cyclical pieces. About 45% is defensive, and roughly 60% of that defensive part is cash and T-bills: $364.7bn at Jun 30, net of unsettled T-bill purchases, per the 10-Q. Exclude the cash and Berkshire is nearly three-quarters cyclical (our calc).

The businesses tell the same story. The BNSF railroad, the manufacturing, service and retail group, and equity-method stakes made 49.3% of Q2 after-tax operating earnings, excluding an FX gain (our calc). And 84% of the $299.25bn stock portfolio is cyclical by sector, led by $AAPL, $AXP, $GOOGL and $BAC (our calc, Q2 13F).

The catch: cash income shrinks when short-term rates fall. Pre-tax interest income fell 12.8% from a year earlier in Q2, which the 10-Q attributes to lower short-term rates. Our read: in a recession with Fed cuts, the cyclical businesses and the T-bill income could fall together. The defensiveness is a balance-sheet property, not an earnings property.

Is the strong run a warning sign for the market? Not by history. Over 30 years, there were 79 earlier times $BRK.B beat $SPY by more than 5 points over 10 days while $SPY fell (Oct 16 qualifies: +5.8% vs −0.8%). Over the next 3 months, $SPY averaged +4.1%, vs +2.8% for any 3-month window (our calc). The windows overlap, and we haven't tested this statistically. Drawdowns along the way were somewhat deeper (average max −6.6% vs −5.1%). Our read: volatility tends to persist. It's not a "the top is in" signal.

What would prove us wrong:
- The Q3 10-Q (early Nov) shows BNSF and the manufacturing, service and retail group holding or growing year over year while $SPY earnings estimates fall.
- The 1-year beta climbs back above ~0.6 by Q1 2027 without a change in the cash pile.
- Cash and T-bills drop below ~20% of total assets (from 28.9%) through deals or share repurchases.
- Interest income stops falling year over year, even if the Fed cuts.
- $SPY falls more than 10% within 3 months of Oct 16. One case wouldn't overturn 79, but we'd note it.

General research, the same for every reader. Not investment advice.