Arcee AI Raises $150M Series B at $1B Valuation

Arcee AI, based in the United States, is an AI startup specializing in post-training and the development of open-weight models. The company recently raised at least $150 million in a Series B round, bringing its total valuation to $1 billion.

Investors

The round was co-led by Vista Equity Partners, Cambium Capital, and Emergence Capital, with additional participation from Microsoft’s M12, AI10 Ventures, Hitachi, IAG, P7, and Wipro.

Arcee AI Use of Funds

Arcee AI plans to allocate the capital toward the development of new open-weight models and products, as well as expanding its partnership with the U.S. Department of Energy and working with Vista Equity Partners' portfolio companies.

About Arcee AI

Founded in 2023 by Mark McQuade, Arcee AI focuses on the post-training process, honing existing models for human interaction and developing open-weight models that allow companies to run AI securely without turning over data to third-party providers.

Funding Details

Company Website: https://arcee.ai

Company: Arcee AI
Raised: $150M
Round: Series B
Funding Date: September 16, 2026
Lead Investor: Vista Equity Partners, Cambium Capital, Emergence Capital
Additional Investors: Microsoft’s M12, AI10 Ventures, Hitachi, IAG, P7, Wipro
Software Category: Artificial Intelligence
Source: https://fortune.com/2026/09/16/arcee-ai-trained-four-models-for-20-million-now-its-worth-1-billion/