#1 S&P 500 Market Cap Rotation Strategy Synthesis

Strategy Overview

The hypothesis proposes that holding exclusively the #1 market-capitalization company in the S&P 500, with daily rebalancing on leadership changes, captures alpha through concentrated exposure to the market's dominant business. The intuition rests on a Livermore principle: the largest company tends to be the "best business of its era," and leadership rotation signals structural shifts in market dominance.

However, the backtest results reveal a critical failure: Sharpe=0.08, CAGR=-5.72%, MaxDD=-93.21% versus SPY's Sharpe=0.839, CAGR=13.7%, MaxDD=-33.72%. The strategy underperforms by 1,050 basis points annualized and experiences nearly 3× the drawdown. The hit rate of 49.96% is barely better than a coin flip. This is not a viable edge—it is a cautionary case study in concentration risk and rebalancing friction.