C3.ai

C3.ai is an enterprise AI application platform company founded in 2009 by Tom Siebel, the billionaire entrepreneur who previously built Siebel Systems (acquired by Oracle for $5.85 billion). Headquartered in Redwood City, California, C3.ai is publicly traded and focuses on delivering AI applications for large enterprises and government agencies.

The C3 AI Platform provides over 100 pre-built enterprise AI applications spanning predictive maintenance, supply chain optimization, fraud detection, energy management, and customer engagement. The platform is designed for organizations that need to deploy AI at scale without building everything from scratch — offering pre-built data models, ML pipelines, and industry-specific applications that can be customized for specific use cases. C3.ai has expanded into generative AI with C3 Generative AI, enabling enterprise search and analysis across organizational data.

C3.ai has strategic partnerships with Microsoft (28+ joint enterprise deals), AWS, and Google Cloud, and serves major customers including Shell, the US Department of Defense, and Koch Industries. The company underwent leadership transition in September 2025 with new CEO Stephen Ehikian, and is restructuring to improve profitability while maintaining its position as a leading enterprise AI platform.