Traders work on the floor at the New York Stock Exchange in New York City, U.S., Dec. 15, 2025.U.S. stocks of late have been shaky as investors turn away from artificial intelligence shares, especially those related to AI infrastructure, such as Oracle, Broadcom and CoreWeave. The worry is that those companies are running into high levels of debt to finance their multibillion-dollar deals.Oracle, for instance, said Wednesday it would need to raise capital expenditure by an additional $15 billion for its cur ...