U.S. stock indexes are rising toward more records Wednesday after tech companies talked up how much artificial intelligence is boosting their results. The S&P 500 rose 0.3% in afternoon trading to add to what looks to be one of its best years of the millennium.

Super Micro Computer investors are still nervous, and they have every right to be. The stock fell 4% Tuesday and was up 1.3% to $40.72 ahead of the open Wednesday, reversing earlier losses. The market is still anxiously awaiting the AI server maker’s delayed financial reports for the year ended June 30 and the September quarter.