C3.ai (NYSE: AI) reported fiscal Q4 revenue of $51.6 million, precisely in line with analyst estimates. That is the only number in this release that lands where expected. Revenue collapsed 53% from $108.7 million a year ago. The non-GAAP net loss per share of $(0.33) beat the $(0.37) estimate by a narrow four cents, but that beat is cold comfort when the top line has been cut in half.
CEO Tom Siebel, who has resumed the role of chief executive, did not mince words. "The sales performance over recent quarters has been entirely unacceptable, to the point of surreal," he said in the release. "We are here to fix it." The company announced a restructuring that produced $10.8 million in charges this quarter, including $5.2 million in severance and related costs and $4.8 million in stock-based compensation expense tied to the reorganization.
The revenue breakdown reveals where the damage is concentrated. Subscription revenue, which makes up 94% of total revenue, fell to $48.4 million from $87.3 million a year ago, a 45% decline. Professional services revenue cratered even harder, dropping 85% to $3.2 million from $21.4 million, driven by a collapse in prioritized engineering services from $17.0 million to $2.1 million. That line item represents bespoke development work that customers pay C3.ai to accelerate; its near-disappearance suggests clients are no longer willing to pay for custom builds on top of the platform.
The GAAP gross margin tells a stark story. It fell to 22% from 62% a year ago. Non-GAAP gross margin, which strips out stock-based compensation and payroll taxes, landed at 37% versus 69% last year. The 32 percentage point GAAP margin compression is not a one-off. Cost of subscription revenue rose to $39.2 million from $37.7 million even as subscription revenue fell by nearly $39 million. That is a structural problem: the cost base did not shrink with revenue. The restructuring is an attempt to address this, but the Q1 FY2027 guidance for non-GAAP loss from operations of $(40.5) million to $(48.5) million implies operating expenses remain elevated relative to the revenue base.
The forward guidance is the real signal here, and it is not encouraging. Q1 FY2027 revenue is expected between $50 million and $54 million, essentially flat with Q4. Full-year FY2027 revenue guidance of $210 million to $240 million implies a decline from FY2026's $250.3 million. The midpoint of $225 million would represent a 10% drop. Management is not forecasting a recovery; they are forecasting stabilization at a lower revenue base. The non-GAAP loss from operations for the full year is guided to $(128) million to $(160) million, which at the midpoint is roughly in line with FY2026's $(217.8) million non-GAAP operating loss when adjusted for the $10.8 million restructuring charge. The burn rate is not improving.
Siebel's personal stock purchase of 6.17 million shares at $11.16 per share, totaling $68.9 million, adds a layer of complexity. It brings the cash balance to $673 million, including $575.4 million in cash and marketable securities on the balance sheet as of April 30. The purchase signals insider conviction, but it also raises the question of whether the cash cushion is being deployed to support the stock rather than into the business. With revenue declining and losses persisting, the $673 million war chest buys time, not a turnaround.
The restructuring and Siebel's return as CEO are the two levers management is pulling. The restructuring charge of $10.8 million is modest relative to the scale of the revenue decline. The real test will be whether the reorganized sales force can reverse the trajectory. The guidance suggests they are not betting on a quick fix. Investors should watch whether subscription revenue stabilizes in the coming quarters. If it does not, the cash balance will start to look less like a cushion and more like a countdown.