BRK.B vs SPY: Buffett Built the Greatest Record in Investing History — But the Last 15 Years Are More Complicated
Warren Buffett's Berkshire Hathaway compounded at 19.8% annually from 1965 to 2024 — roughly double the S&P 500. But since 2010, BRK.B and SPY have traded roughly even. The market has gotten more efficient, Berkshire has gotten bigger, and the question of whether the Berkshire edge persists into the post-Buffett era is genuinely open.
The Core Difference
SPY is purely passive — it holds the 500 largest US companies by market cap and rebalances mechanically when the composition changes. No human judgment. No management fee beyond 0.0945%. SPY has beaten the vast majority of active fund managers over any 10+ year period.
BRK.B is the B-class share of Berkshire Hathaway — effectively an actively managed conglomerate. It owns insurance businesses (GEICO), a railroad (BNSF), energy utilities, consumer brands, and a $300B+ stock portfolio built by Buffett. The stock portfolio is highly concentrated: Apple alone has represented 40–50% of the equity portfolio in recent years. BRK.B has no management fee but takes positions that reflect Buffett's (and now Greg Abel's) judgment calls.
Business Comparison
- Conglomerate: insurance, railroad, energy, consumer
- Active stock portfolio (~$300B)
- No dividend, no management fee
- Value-tilt, heavy financials/consumer
- Succession risk (Abel post-Buffett)
- Massive cash reserves ($170B+ in 2024)
- Passive S&P 500 index fund
- 500 holdings across all US sectors
- ~1.3% dividend yield, 0.0945% fee
- Market-cap weighted, includes tech mega-caps
- No manager risk — purely mechanical
- Beaten most active managers over 10+ years
Why BRK.B Has Struggled to Pull Away Since 2010
Berkshire's size is now its constraint. With $900B+ in market cap, BRK cannot take meaningful positions in small or mid-cap companies — the needle-movers that built the early record. Berkshire needs to deploy $10B+ in a single investment to move the portfolio, which limits the opportunity set to the same mega-cap universe that SPY already holds efficiently.
The tech era has also been unkind to Berkshire's framework. Buffett famously avoided tech stocks for years — missing most of the Nasdaq's 2009–2021 supercycle. The late Apple investment (starting in 2016) recovered some ground, but the underperformance versus QQQ during the AI boom years highlights a structural limitation: Berkshire's model is built for capital-intensive businesses with predictable moats, not software companies with infinite scalability.
Which Fits Which Investor
Technical Signals — What to Watch
BRK.B and SPY are correlated — both fall in broad market selloffs. But BRK.B has historically held up better in technology-driven selloffs (2022) because its portfolio is less tech-heavy. In tech-driven bull markets, SPY leads.
- RSI: BRK.B tends to trade at lower RSI than SPY in tech bull markets — it lags, not leads, in growth-driven rallies.
- MACD: BRK.B MACD signals are cleaner than individual stocks — it moves with the broad market but with less noise from earnings surprises.
- Volume: Watch for unusual BRK.B volume around Berkshire's annual report and shareholder letter — Buffett commentary can catalyze multi-day moves.
APEX scores both daily across RSI, MACD, moving averages, volume, and 52-week position. Updated every market day.
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