The US stock market opened mixed today, following a higher close yesterday where the S&P 500 and the Dow Jones Industrial Average edged slightly higher. The market could continue to benefit from optimism fueled by last week's rate cut from the Federal Reserve and the dovish comments from Fed members during the week as well as expectations of additional rate cuts.

However, investors could remain cautious ahead of new economic data releases. Investors are awaiting GDP growth data tomorrow in addition to the comments of Fed Chair Jerome Powell and other members for further insights into the central bank's monetary policy outlook. Friday's Personal Consumption Expenditures (PCE) data could also affect sentiment.

Mega-cap stocks opened with a mixed performance. Investors could focus on Alphabet and Microsoft after Google filed an antitrust complaint with the European Commission, accusing Microsoft of using unfair licensing contracts to compel customers to use its cloud services.

At the same time, the semiconductor industry was seeing positive developments with Nvidia and Intel rising. Micron Technology is set to report earnings after the market close, which may impact semiconductor stocks in the next trading session.