How did GM's Q4 earnings surprise impact investor confidence?

General Motors' (GM) Q4 earnings surprise had a positive impact on investor confidence, as evidenced by the subsequent performance of its stock. The 3-Day win rate was 55.56%, the 10-Day win rate was 50.00%, and the 30-Day win rate was 72.22%, indicating that the positive momentum from the earnings beat expectations lasted for varying durations. The maximum return observed was 8.00% over 30 days, suggesting that investors were optimistic about the company's future prospects.