SPY ETF Mean Reversion Strategy

Single-Instrument Design

This strategy trades only the SPY ETF, the most liquid equity instrument available. By focusing on a single ticker, it eliminates individual stock risk (earnings, management changes, sector rotation) and reduces the strategy to pure broad-market mean-reversion exposure. There is no stock selection component, the only decisions are when to enter and exit SPY based on oversold conditions.

Scalability and Liquidity

SPY trades billions of dollars in daily volume, making execution at backtested prices realistic for virtually any account size. Unlike strategies that trade individual stocks, there are no capacity constraints or liquidity filters needed. This makes it suitable for both small accounts and larger allocations without modification to the position sizing logic.

Regime-Adaptive Exits

The strategy uses dynamic exit logic that adjusts to the current volatility environment. In low-volatility regimes, it holds for larger targets. In high-volatility regimes, it takes profits faster. This adaptive exit approach aims to extract consistent returns across varying market conditions. Backtested since 2000 with walk-forward analysis and Monte Carlo simulation validation.