[Microsoft's Market Cap Surpasses $4 Trillion, Paypal Rises Over 7%] U.S. stocks opened on a positive note, with the Dow Jones Industrial Average up 0.4%, the S&P 500 Index up 0.29%, and the Nasdaq Composite Index up 0.5%. Microsoft (MSFT.O) shares rose 3.7% after signing a new agreement with OpenAI, pushing its market capitalization past $4 trillion for the first time. Paypal (PYPL.O) shares surged 7.5% as the company announced that its digital wallet functionality will be integrated into the ChatGPT platform, further boosting market optimism about its business integration capabilities.