C3.ai: Sustained Revenue Declines Over the Past Year
C3.ai (AI +1.75%) primarily generates revenue by providing specialized enterprise artificial intelligence software applications and development platforms to global organizations.
While securing a multi-year agreement extension to scale predictive maintenance software across global asset operations for Shell and reinstating founder Thomas M. Siebel as Chief Executive Officer, it reported a net income margin of -224% for the quarter ended April 30, 2026.
Lumentum: Consistent Revenue Expansion Across Recent Reporting Periods
Lumentum (LITE -9.87%) primarily earns revenue by manufacturing critical optical communications components, network modules, and commercial lasers for enterprise clients.
It advanced the ongoing establishment of a dedicated new optical device manufacturing facility in Greensboro, North Carolina, while recording an operating margin of 27% for the quarter ended June 27, 2026.
Why Revenue Performance Matters for Investors
Revenue serves as the fundamental baseline measure of the total sales volume a business generates from its core commercial operations before any daily operating expenses, debt interest payments, or standard corporate taxes are deducted. This metric helps investors measure a company’s overall size, market footprint, and long-term trajectory.
Tracking Quarterly Revenue Totals for C3.ai and Lumentum
| Calendar quarter | C3.ai Revenue | Lumentum Revenue |
|---|---|---|
| Q3 2024 | $94.3 million (quarter ended Oct. 31, 2024) | $336.9 million (quarter ended Sept. 28, 2024) |
| Q4 2024 | $98.8 million (quarter ended Jan. 31, 2025) | $402.2 million (quarter ended Dec. 28, 2024) |
| Q1 2025 | $108.7 million (quarter ended April 30, 2025) | $425.2 million (quarter ended March 29, 2025) |
| Q2 2025 | $70.3 million (quarter ended July 31, 2025) | $480.7 million (quarter ended June 28, 2025) |
| Q3 2025 | $75.1 million (quarter ended Oct. 31, 2025) | $533.8 million (quarter ended Sept. 27, 2025) |
| Q4 2025 | $53.3 million (quarter ended Jan. 31, 2026) | $665.5 million (quarter ended Dec. 27, 2025) |
| Q1 2026 | $51.6 million (quarter ended April 30, 2026) | $808.4 million (quarter ended March 28, 2026) |
| Q2 2026 | Not yet reported | $1.0 billion (quarter ended June 27, 2026) |
Data source: Company filings. Data as of Aug. 17, 2026.
Foolish Take
Examining the revenue trends for C3.ai and Lumentum reveal insights into the growth trajectories of these two tech companies focused on the rapidly rising artificial intelligence market.
C3.ai was on a quarterly growth trajectory until founder and CEO Thomas Siebel had to step down in 2025 due to a health issue. That’s when the company’s sales began to fall. Siebel resumed the CEO role in June of 2026. The question remains whether his return can galvanize C3.ai’s eventual rebound. For now, the company estimated revenue between $50 million to $54 million in the next quarter.
Lumentum’s high-speed optical and photonic products are in demand among customers building AI systems. This is what’s fueled the company’s quarterly sales expansion, which has only accelerated. The company wrapped up its 2026 fiscal year on June 27 with $1 billion in fourth-quarter sales, a spectacular increase from the prior year’s $480.7 million.
Lumentum expects its quarterly revenue growth trend to continue into its fiscal first quarter. It forecasted Q1 sales in the range of $1.2 billion to $1.3 billion.
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