Regional bank stocks surged on Wednesday, marking their strongest one-day performance in four years as investors bet on a more favorable banking sector environment when Donald Trump returns to the White House. The SPDR S&P Regional Banking ETF (NYSE:KRE) — which tracks a basket of 147 small- and mid-cap U.S. banks — jumped 13.4%, posting its largest rally since November 2020. Back then, the announcement of the first COVID-19 vaccine sparked a broad market rebound. In Wednesday’s trading, regional banks outshined even the biggest U.S. banks. Financials were the top-performing sector in the S&P …