Apple Inc.'s stock experienced a significant surge on April 9, 2025, closing up 15.3% from its morning low. The stock's rise added approximately $0.4 trillion to its market capitalization, reflecting strong investor confidence. Throughout the day, the stock price fluctuated, reaching highs of 3%, 6%, 9%, 12%, and ultimately 15% above its opening value, showcasing volatility but ending the day with a substantial gain.