Oracle shares jumped nearly 9% in Frankfurt on Wednesday, after U.S. President Donald Trump said the company would make a large investment in artificial intelligence infrastructure, together with OpenAI and SoftBank. The joint venture, called Stargate, plans to invest $500 billion, Trump said at the White House the previous day. Oracle shares rose 3% after the closing bell on Tuesday, having finished regular trading up 7%, boosted by reports of the joint venture.