Nebius Group's stock surged 5.15% during Friday's intraday trading session following the announcement of a strategic acquisition aimed at strengthening its artificial intelligence infrastructure business.

The Amsterdam-based AI cloud company agreed to acquire inference optimization startup Eigen AI in a deal valued at approximately $643 million, to be paid in a combination of cash and Nebius Class A shares. The transaction is expected to close in the coming weeks, subject to regulatory approvals.

The acquisition is designed to bolster Nebius's Token Factory platform, a managed inference service that helps companies deploy open-source AI models in production. Eigen AI's technology stack for optimizing AI model performance will be integrated directly into Token Factory. The move accelerates Nebius's expansion in the United States by establishing a new engineering and research presence in the San Francisco Bay Area and capitalizes on the rapidly growing inference segment of the AI market.