U.S. Big Tech companies that signed are Amazon, Anthropic, Google, IBM, Microsoft and OpenAI. Elon Musk’s xAI has signed onto one of the three chapters of the code. The most prominent European tech companies that signed are Aleph Alpha and Mistral AI.

Also on the list are Accexible, AI Alignment Solutions, Almawave, Bria AI, Cohere, Cyber Institute, Domyn, Dweve, Euc Inovação Portugal, Fastweb, Humane Technology, Lawise, Open Hippo, Pleias, Re-AuditIA, ServiceNow, Virtuo Turing and Writer.

Meta is the most significant holdout. The company earlier announced it would not sign the code.

Those not signing the code of practice will still have to live up to the requirements laid down in the EU’s AI Act. The Commission has said it would take tougher action against companies that didn’t sign up.