HPQ is heading for its best single-session gain in more than 10 yearsDespite the major indexes swimming in red ink today, the shares of C3.ai Inc (NYSE:AI) and HP Inc (NYSE:HPQ) are skyrocketing, after the two tech companies reported better-than-expected fiscal fourth- and second-quarter results, respectively. C3.ai stock is 17.9% higher to trade at $28.19, on track for its best single-session gain since Feb. 29 and poised for its highest close since March 18. The artificial intelligence (AI) company's earn ...