Beat the Market: An Effective Intraday Momentum Strategy for S&P500 ETF (SPY)
This paper investigates a simple yet effective intraday momentum strategy for SPY, a highly liquid ETF tracking the S&P500. Unlike typical studies that limit trading to the last 30 minutes, our model initiates trades based on intraday demand/supply imbalances. Using techniques from active day traders and dynamic trailing stops, the strategy achieved a 1,985% total return (net of costs), 19.6% annualized return, and a 1.33 Sharpe Ratio from 2007 to early 2024. We analyze its performance across market volatility regimes, day-of-the-week effects, and compare it to other technical patterns, considering the impact of commissions and slippage.