C3.ai Inc (NYSE:AI) stock is at the bottom of the Nasdaq today, last seen down 26% to trade at $16.40. The artificial intelligence (AI) software company pre-announced that first-quarter earnings and revenue would be dramatically below estimates. In response, D.A. Davidson downgraded the stock to "underperform" from "neutral," along with a price-target cut to$13 from $25. UBS and Wedbush trimmed their price targets to$23 as well. This is poised to be AI's worst single-session drop ever. The shares earlier ...