Shares in artificial intelligence data-center companies fell Thursday—the president’s $500 billion spending drive might raise more questions than answers.

Oracle's shares jumped nearly 9% before the bell on Wednesday after U.S. President Donald Trump said the company would make a large investment in artificial intelligence infrastructure, alongside OpenAI and SoftBank.

SoftBank Group Corp., OpenAI, and Oracle Corp. are forming a $100 billion joint venture to fund artificial intelligence infrastructure, an effort unveiled with President Donald Trump aimed at speeding development of the emerging technology.

The $500 billion Stargate project will be critical to "maintain American leadership in AI," one of the partners said in a statement.

Several large technology firms including OpenAI, SoftBank, Oracle, Nvidia, and MGX have partnered to set up a new company in the US to ramp up AI infrastructure in the country. Named Project Stargate,

The Stargate project aims to secure American leadership in AI, protect US national security, and create hundreds of thousands of jobs.