Nebius Group (NASDAQ: NBIS) announced an agreement to acquire Eigen AI, an inference and model optimization company, for approximately $643 million in cash and Class A shares.

The deal will integrate Eigen AI's optimization technology into Nebius Token Factory, the company's managed inference platform for production artificial intelligence applications. The acquisition combines Eigen AI's optimization capabilities with Nebius's global compute capacity and AI cloud platform.

Eigen AI's founding team includes researchers from MIT's HAN Lab. Co-founder Ryan Hanrui Wang developed Sparse Attention technology, while Wei-Chen Wang received the MLSys 2024 Best Paper Award for Activation-aware Weight Quantization, which has become a standard for 4-bit model serving in production deployments. Co-founder Di Jin contributed to Meta's Llama 3 and Llama 4 post-training development.

The acquisition will establish a Nebius engineering and research presence in the San Francisco Bay Area through Eigen AI's team. Eigen AI's optimization layers will be integrated directly into Nebius Token Factory, which provides autoscaling endpoints and fine-tuning pipelines across open-source models.

Roman Chernin, co-founder and Chief Business Officer of Nebius, said the integration will establish Nebius Token Factory "at the frontier of inference, offering customers market-leading model performance and unit economics with massive compute capacity to back it at scale."

The transaction consideration is based on Nebius's 30-day weighted average stock price as of signing and is subject to adjustments. The deal is expected to close in the coming weeks, pending customary conditions including antitrust clearance.

The information is based on a company press release.