MGX (Tahnoon/G42/Mubadala) Ups Anthropic Stake; Now Holds All Three Frontier AI Labs

On June 1, 2026, Abu Dhabi’s MGX — the AI investment vehicle launched in 2024 by G42 and Mubadala, chaired by UAE National Security Adviser Sheikh Tahnoon bin Zayed — increased its pre-IPO stake in Anthropic as part of Anthropic’s $65 billion fundraise. MGX now holds equity positions in all three leading U.S. frontier AI model labs simultaneously: Anthropic, OpenAI, and xAI. The investment occurred in the same period that Defense Secretary Pete Hegseth declared Anthropic a “supply chain risk” (late February/March 2026) and Trump ordered all federal agencies to cease use of Anthropic’s technology — meaning the UAE entity most closely aligned with Tahnoon’s intelligence and technology apparatus is actively expanding its ownership stake in a company the U.S. government has simultaneously blacklisted from military use. No CFIUS review has been documented as of this writing; sweep performed 2026-06-05. This finding is a verified absence: no tier-1 or tier-1-equivalent reporting on a CFIUS review was found; this does not conclusively establish no review occurred.

The triple-ownership pattern is the structurally load-bearing finding: a single entity controlled by the UAE’s national security adviser now holds equity in Anthropic, OpenAI, and xAI simultaneously — the three companies developing the most capable AI systems in the U.S. — giving the UAE’s intelligence apparatus financial leverage across the entire frontier AI landscape without (as of this sweep) triggering the foreign-investment review process designed to catch exactly this scenario. Tahnoon’s interlocking roles as UAE National Security Adviser + MGX chair + Abu Dhabi Investment Authority chair mean this is not passive portfolio management but strategic positioning at the intelligence-technology nexus. The investment pairs with the Stargate UAE build-out (G42-partnered AI campus in Abu Dhabi, first 200 MW coming online 2026) as the infrastructure-plus-equity Gulf-state AI capture pattern: MGX gains equity claims over the model layer while G42 builds the compute infrastructure layer — a dual-track control architecture over U.S.-developed AI technology. Cross-cuts: government-contracts (Pentagon blacklisted Anthropic while its key investor is the UAE NSA); the CFIUS-absence finding is an action-forcing item for the next research-task sweep.