Zak Brown put pen to paper. The McLaren Racing CEO dispatched formal correspondence to the FIA calling for immediate rule changes that would prohibit any individual or entity from holding ownership positions in multiple Formula 1 teams. The letter landed as the grid stabilizes at 10 teams and franchise values push past $1 billion per entry.

Brown's timing isn't random. The current Concorde Agreement runs through 2025, with renegotiations already underway for the next commercial cycle. Any structural governance changes require FIA regulatory amendment, which means McLaren wants this resolved before the paddock turns over contracts. Brown cited competitive integrity as the core concern—the risk that shared ownership creates conflicts of interest in technical development, driver transfers, and race strategy. He did not name specific teams or entities in the letter, but the subtext is straightforward: close the door before someone walks through it.

The letter matters because F1's valuation surge has attracted sovereign wealth funds, private equity platforms, and billionaire consortiums shopping for fractional stakes. Liberty Media paid $4.4 billion for the commercial rights in 2017; individual teams now trade at valuations that make partial ownership across multiple entries financially plausible. Brown's concern is that a well-capitalized investor could quietly accumulate minority positions in two or three teams, gaining insight into technical programs, sponsor pipelines, and personnel moves that should remain walled off. The FIA's current regulations don't explicitly prevent it—ownership thresholds focus on majority control and constructor independence, not cross-holdings below board-level influence.

McLaren's position reflects its own franchise math. The team secured a $185 million capital injection from MSP Sports Capital in 2020, structured to preserve operational control while bringing institutional finance into the paddock. Brown has been vocal about protecting team equity as F1's commercial model shifts toward NFL-style franchise stability. Banning shared ownership makes sense if you believe team values will keep climbing—any investor holding pieces of multiple entries dilutes the scarcity premium that drives those valuations. It also signals that McLaren sees itself as a premium standalone asset, not part of a multi-team portfolio play.

The FIA's regulatory calendar is the constraint. Mohammed Ben Sulayem took over as FIA president in December 2021 and has focused on cost-cap enforcement and technical regulations. Ownership structure amendments require World Motor Sport Council approval, which typically happens twice per year. If Brown's letter generates support from other team principals—Ferrari, Mercedes, and Red Bull all operate as single-entry franchises—the FIA could table a draft regulation by mid-2025. If it stalls, the window stays open through the next Concorde cycle, which means any investor with $500 million and a taste for options could start building positions.

Watch the next Team Principals' meeting, scheduled for April in Shanghai. Brown will need allies. Christian Horner and Toto Wolff have their own reasons to keep ownership structures simple—Red Bull and Mercedes both run tight ships with clear decision-making hierarchies. Ferrari has never entertained outside investors beyond its FCA parentage. If those three line up behind McLaren, the FIA's hand is forced. If they stay quiet, Brown's letter becomes a solo position paper, and the door stays open. The other variable is Andretti's stalled entry bid. If the FIA greenlights an 11th team in the next two years, ownership rules suddenly matter more—new entrants might look for established teams to partner with on the cap table, and that's exactly what Brown wants to prevent.