Prueba retrospectiva
The backtest results indicate that AXP shows a positive price reaction following earnings beats, with win rates improving over time and a 3.89% average return at 30 days. This suggests sustained gains beyond the initial days after the event. In contrast, the Consumer Finance industry overall shows minimal impact from earnings beats, implying that AXP's strong performance is somewhat unique. Investors may find value in holding AXP shares for up to a month post-earnings beat to maximize returns, while being cautious about generalizing this to the broader industry.