C3.ai fell over 10% in premarket trading after Q1 FY26 results missed estimates, posting a $0.37/share loss on $70.3 million revenue versus expectations of a $0.21 loss and $93.9 million. The miss was linked to a sales reorg and founder Tom Siebel’s health issues. Shares remain down ~52% YTD, even as new CEO Stephen Ehikian took charge on September 1.