Most investors obsess over returns. But a +80% portfolio that went through a -70% drawdown is far more dangerous than a +20% portfolio with only a -10% drawdown. MDD (Maximum Drawdown) is the metric that captures this difference.
What Is MDD?
MDD measures the largest peak-to-trough decline before a new high is reached. Formula: MDD = (Trough - Peak) / Peak x 100.
The math of recovery is brutal. A -50% drawdown requires +100% to break even. QQQ worst drawdown was -82.97% during the dot-com bust, requiring +488.2% recovery -- it took 14 years and 7 months (PortfoliosLab).
Historical MDD: Real Numbers
- QQQ (Nasdaq 100): -82.97%, recovered in 14.5 years
- SPY (S&P 500): -55.19%, recovered in ~5.5 years
- KOSPI: -46.4% during 2007-2008 financial crisis
- Warren Buffett Berkshire Hathaway: -45.52% all-time MDD
- Ray Dalio All-Weather Portfolio: -20.58% all-time MDD (LazyPortfolioETF)
Setting Your MDD Target
- Near retirement (5 years): max 10%
- Conservative: 10-20% (hedge fund standard)
- Balanced age 30-50: 20-30%
- Aggressive 10+ year horizon: 30%+
Calmar Ratio = CAGR / |MDD|. Above 1.0 is considered strong (Corporate Finance Institute).
Three Strategies to Reduce MDD
- Cross-asset diversification: Add bond ETFs or gold (std dev ~0.2x equities)
- Tolerance-band rebalancing at +/-5% from target allocation
- Individual position stop-losses at -5% to -8% (hedge fund standard)
2026 Context
S&P 500 triggered a death cross in April 2026. Magnificent 7 stocks are averaging -23% from year-start. Now is a practical time to calculate your portfolio MDD and verify it stays within your target range.
For the full analysis in Korean, visit Snakestock.
