C3.ai's fourth quarter 2026 revenue plunged 53% YoY as founder resumes CEO role to fix 'unacceptable' sales.

C3.ai reported fourth quarter revenue of $51.6 million, a sharp 52.5% decline from the prior year, and a GAAP EPS loss of $(0.79). The results were accompanied by the announcement that founder Thomas M. Siebel has resumed the role of CEO to address what he termed 'entirely unacceptable' sales performance.

Key Highlights

• Fourth quarter revenue declined 52.5% year-over-year to $51.6 million from $108.7 million, with subscription revenue falling 44.6% to $48.4 million.
• Founder Thomas M. Siebel has returned as CEO, stating, "The sales performance over recent quarters has been entirely unacceptable, to the point of surreal. We are here to fix it."
• The company's full-year fiscal 2027 revenue guidance of $210 million to $240 million projects a year-over-year decline from the $250.3 million reported for fiscal 2026.