OpenAI Internal Targets Missed; S&P 500 Falls 0.49%

Following a WSJ report that OpenAI missed internal targets for weekly active users and revenue, the S&P 500 closed on April 28 at 7,138.80, down 0.49%. Semiconductor stocks including NVIDIA, AMD, and Broadcom declined in tandem, while the Nasdaq fell 0.9% to close at 24,663.80. Questions about AI infrastructure ROI have widened among investors.