SpaceX CEO Elon Musk on Wednesday announced the the company’s xAI artificial intelligence venture implemented a reorganization that “required parting ways with some people.”

The overhaul was done “to improve speed of execution,” Musk said in a post on X. He did not say which employees may have been cut as a result of the restructuring or which employees may have resigned of their own volition.

“We are hiring aggressively,” Musk added.

Earlier this week, xAI co-founders Jimmy Ba and Tony Wu announced their exits after several other founding members, including Igor Babuschkin, Kyle Kosic, Christian Szegedy and Greg Yang, previously departed.

Last week, Musk announced a record-setting, all-stock transaction in which SpaceX, the aerospace and defense juggernaut, acquired xAI, which owns and operates social network X and is the developer of Grok, the embattled AI chatbot and image generator.