On October 1, 2025, the US stock semiconductor sector showcased robust performance. Micron Technology stole the spotlight, with its shares soaring over 5% and reaching an all-time high. Meanwhile, Applied Materials and Arm also saw their stock prices climb more than 3%. ASML and TSMC weren't far behind, with both companies witnessing their shares rise over 2%. Additionally, Nvidia's stock price managed to turn positive, adding to the sector's overall bullish sentiment.