Key uncertainty: Under the current Concorde Agreement, only 12 teams are permitted. With Cadillac entering as #11, a BYD entry as #12 would require a commercial agreement with FOM and approval from existing teams . The higher-cost route of building a new team versus a sponsorship deal remains undecided
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Horner was sacked by Red Bull on July 9, 2025, three days after the British Grand Prix, ending a 20-year tenure that delivered 6 constructors' and 8 drivers' championships. He was replaced by Laurent Mekies .
FIA president Mohammed Ben Sulayem has been the most vocal public figure backing a Horner return. His comments have been emphatic and consistent:
Bottom line on Sulayem's stance: His comments strongly imply he already knows Horner's destination but is not disclosing it .
BYD's potential entry is directly relevant to Horner because it represents a possible landing spot for him as a team principal.
The FIA president has publicly endorsed both BYD as the right 12th team and Horner's return, though he has not explicitly connected them .
The most supported reading of the evidence is that BYD's interest in an F1 entry is real and advanced, that Horner is actively seeking a team principal return, and that Ben Sulayem is publicly paving the way — but a formal BYD-Horner partnership remains unconfirmed speculation as of July 2026.