Public records and domain-sale reports indicate SpaceXSi.com was acquired today for Elon’s side.
WHOIS for spacexsi.com lists the registrant organization as X.AI LLC (US), with registrar MarkMonitor Inc. The record was updated on 7 October 2026.

Related but separate: SpaceXAI LLC filed a US trademark for SPACEXSI on 4 October 2026 (serial 50143825)