As Warren Buffett Enters Retirement, An Overlooked Berkshire Trade From Last Year Is Back in Focus. Should Investors Be Worried Heading Into 2026?

Berkshire Hathaway disclosed in its Q4 2024 13F that it exited positions in two S&P 500 ETFs (VOO and SPY), a move the author attributes to valuation concerns as the Shiller CAPE approached ~37 at year-end (now closer to 40) amid a tech/AI-driven market rally. The piece notes Berkshire has shifted into cash and Treasury bills while Buffett prepares to hand the CEO role to Greg Abel in 2026, and it highlights that despite high valuations and concentrated mega-cap leadership, long-term S&P 500 returns remain historically attractive.

Analysis

Market structure: The sell-off of VOO/SPY by a large, value-oriented holder signals two simultaneous forces — concentration risk in a handful of AI mega-caps (NVDA, etc.) that are propping the S&P, and marginally increased demand for cash/T-bills from large allocators. Winners: short-term Treasury issuers (T-bills, BIL/SHV), active value managers, exchanges (NDAQ) that benefit from volatility and flows; losers: crowded passive tech exposures and leveraged long-volatility structures if a snap reversion occurs. Cross-assets: expect downward pressure on term premiums if cash is parked in Treasuries (yields modestly lower), USD bid as safe haven, and cyclical commodities vulnerable to a growth scare.

Risk assessment: Tail scenarios include a 25–40% drawdown in the S&P within 6–12 months if earnings disappoint or AI regulation/antitrust hits top caps, and a liquidity squeeze in ETFs if passive flows reverse quickly. Immediate (days) risk is elevated realized vol; short-term (weeks–months) is sector rotation and earnings beats/misses; long-term (quarters–years) is structural valuation re-rating if AI margins normalize. Hidden dependencies: derivatives positions (index options, volatility swaps) concentrated on mega-caps and financing/leverage in quant funds that can amplify moves. Key catalysts: Fed pivot/no-pivot within 60–90 days, Q1 2026 earnings for top-10 market-cap names, and any material AI regulatory announcements.

Trade implications: Reduce plain S&P beta and add asymmetric protection: shift 3–5% of portfolio into short-term Treasuries (BIL/SHV) within 7–30 days and buy 9–12 month SPY downside protection (see actions). Favor selective longs in financially leveraged/valuation-recovery names (BRK.B, NDAQ, XLF) sized 1–3% each and hedge with a 12-month short QQQ position (or buy QQQ put spread) to capture expected mean reversion. Use options: buy put spreads on SPY (9-month, 15–25% OTM) and use call-selling on NVDA to monetize time decay if you hold exposure.

Contrarian angles: Consensus treats a high CAPE as definitive sell signal; that omission ignores earnings-driven index skew — AI earnings growth can structurally lift indices without broad participation. The market may overprice a blanket de-risking opportunity: a 10–20% sell-off would likely create high-quality entry points in industrials, financial exchanges (NDAQ), and BRK.B, not just tech. Unintended consequence of mass passive outflows is higher single-stock dispersion — tradeable via single-name options and dispersion strategies rather than blunt index positions.

Key Decisions for Investors

• Establish a 3% portfolio allocation to short-term Treasury ETFs (split BIL 60% / SHV 40%) within 7 trading days to lock liquidity; target reallocation horizon 30–90 days for redeployment if S&P falls >10%.
• Deploy 0.75–1.25% of portfolio to a 9–12 month SPY put spread as tail insurance: buy 9-month SPY 20% OTM put and sell 9-month 30% OTM put to cap cost; increase to 2% only if VIX >25 or SPY drops >8% intraday.
• Initiate a 1.5–3% relative-value pair: long BRK.B (BRK.B) 1.5–3% weight vs short QQQ equal dollar notional for 12 months; stop-loss if BRK.B underperforms QQQ by 12% in 60 days, target relative outperformance 6–12% if tech mean reverts.
• Rotate 2–4% from passive S&P exposure into selective cyclical/value: buy NDAQ (1–2%) and XLF (1–2%) over 30 days using DCA; hedge with quarterly QQQ put spread (3–6% OTM) during earnings windows to protect downside.