Nvidia shares posted modest gains during the regular session, buoyed by the company's announcement of a record $150 billion share buyback program. This massive capital return, which brings the total authorization to $235 billion through fiscal 2028, signaled management's confidence in sustained AI-driven growth and robust cash generation. The positive sentiment surrounding the buyback and the launch of a new open-source AI agent safety platform helped the stock outperform a broader tech sector that faced downward pressure from rising Treasury yields and geopolitical tensions.