Shareholders of data centre infrastructure provider Core Scientific have voted against its previously announced $9bn acquisition by cloud infrastructure company CoreWeave.

Core Scientific said that the required majority approval from its stockholders was not obtained, and, in line with the terms of the agreement, it has terminated the deal with immediate effect.

The company will continue to operate independently as a publicly listed entity, with its shares trading on Nasdaq under the ticker symbol CORZ.

CoreWeave is also currently listed on Nasdaq.

The all-stock deal was announced in July 2025. Under its terms, each Core Scientific share was to be exchanged for 0.1235 newly issued shares of CoreWeave Class A common stock.

The agreement followed CoreWeave’s initial public offering in March 2025, which positioned it for increased vertical integration within digital infrastructure and data centre operations.

Had the merger proceeded, CoreWeave would have acquired control over approximately 1.3 gigawatts (GW) of gross power capacity across Core Scientific’s data centre portfolio in the US. There was also potential for more than 1GW in further expansion.

This would have allowed CoreWeave to further consolidate its footprint in high-density colocation and digital asset mining infrastructure.

CoreWeave had identified several expected outcomes from the acquisition. These included cost reductions through business process streamlining and reduced lease obligations.

The company also anticipated greater flexibility in structuring infrastructure financing and lowering capital costs. It expected more direct control and optionality regarding critical power resources.

In addition, Core Scientific’s data centre development capabilities were expected to augment CoreWeave’s expertise in power procurement, construction, and site management.

In a separate development, CoreWeave has acquired Marimo, creator of the open-source marimo notebook, a Python-based reactive development environment optimised for AI and data intensive workloads.

Terms of this acquisition were not made public.

CoreWeave stated that integrating Marimo into its ecosystem is intended to combine its infrastructure with open-source innovation and accelerate AI development and deployment for developers.

Integration plans involve embedding Marimo’s technology into the CoreWeave Cloud platform, enhancing cloud-hosted notebook services and facilitating an integrated workflow across model training, inference, data handling, and iteration cycles.

Marimo’s offering is designed for version-controlled programming with seamless scalability from prototyping to production deployment. This acquisition is intended to enhance CoreWeave’s developer platform capabilities for AI application development.