McLaren CEO Zak Brown sent a formal letter to FIA President Mohammed Ben Sulayem calling for regulatory changes that would prohibit any entity from holding ownership stakes in multiple Formula 1 teams. The letter, filed through official FIA governance channels, seeks to codify what has been an informal constraint on franchise ownership structures since the sport's modern commercial era began.

Brown's letter does not name specific teams or investors. The timing follows €800 million in private equity activity across F1 team stakes in the past eighteen months—CVC Partners holding 33% of Williams, MSP Sports Capital owning roughly 15% of McLaren, and Otro Capital taking a minority position in Alpine parent Renault's racing operation. None of those structures cross the ownership threshold Brown is targeting, but the proliferation of financial sponsors with portfolio appetites creates adjacency risk. A family office investing in two teams through separate SPVs, for example, currently sits in regulatory ambiguity.

The governance hole Brown is highlighting exists because F1's Concorde Agreement—the commercial contract binding teams, the FIA, and Formula One Management through 2025—contains no explicit prohibition on common ownership. The agreement restricts technical sharing and mandates arm's-length competitive distance, but ownership itself is unaddressed. That worked when team ownership was dynasty capital or automotive OEM balance sheets. It frays when consortium investors and sovereign wealth portfolios start sizing paddock exposure as an asset class. Saudi Arabia's Public Investment Fund, which acquired ~8% of Aston Martin's parent company in 2023, has been mentioned in Alpine sale rumors for six months. Nothing prevents PIF from holding two team stakes at different weightings.

Brown's move also clarifies McLaren's positioning for the 2026 engine regulation reset. The team is locked into Mercedes power units through 2030 under a deal signed in 2022. But Honda's return as an Aston Martin works partner—and Red Bull's deepening relationship with Ford branding on its own powertrain—means customer engine supply is tightening. If a financial investor controlling two teams can arbitrage engine allocation or aero development priority, McLaren's access becomes a chessboard, not a contract. Brown is making sure the board stays simple.

The FIA's response timeline depends on whether Brown's letter triggers formal rulemaking or gets absorbed into broader Concorde renegotiations already underway for the 2026-2030 cycle. If the FIA moves unilaterally, expect a governance bulletin by June. If this folds into Concorde, the ban language could take until late 2024, with effective enforcement beginning when the new agreement activates in 2026. Watch for how Alpine's ownership clarity plays out—Renault's board is expected to make a decision on full divestment or retention by March—and whether any consortiums quietly restructure before a rule locks.

Brown's letter lands the same week F1 announced record $3.2 billion in 2023 revenue. When the money gets serious, the structures get specific.