Ferrari's Formula 1 team valuation crossed $1 billion in recent private assessments, according to three people familiar with the figures, while McLaren CEO Zak Brown sent a letter to FIA President Mohammed Ben Sulayem requesting explicit rule changes to prevent any entity from holding stakes in multiple teams.

The timing isn't subtle. Ferrari's valuation—the first F1 constructor to breach ten figures in standalone team value, separate from the road-car business—comes as the sport debates a $450 million anti-dilution payment for an eleventh team slot and clarifies governance ahead of the 2026 engine regulation reset. Brown's letter, sent within the past two weeks, asks the FIA to amend its sporting code to eliminate "the possibility of any future common team ownership structures," language that targets scenarios where a sponsor, investment vehicle, or holding company could quietly accumulate positions across the grid. Brown declined to comment on the letter's contents. The FIA did not respond to a request.

The valuation jump matters because it resets baseline expectations for what a constructor seat is worth. Alpine's parent Renault has fielded offers in the $900 million range for its team, per two sources with direct knowledge, though no formal sale process has launched. Sauber, soon to become Audi's works entry, was acquired by the German manufacturer at an enterprise value near $550 million in 2022. Ferrari's $1 billion-plus figure—reached despite no recent controlling-stake transaction—suggests the market now prices in commercial-rights growth, the Las Vegas race's $500 million annual economic impact to the calendar, and Netflix's continued audience pull. One family office sizing a minority Alpine stake told colleagues the math works at 15x EBITDA if you model three new races by 2028 and stable cost-cap enforcement.

Brown's letter is less about current ownership than future structure. No team today violates F1's one-entity, one-team rule, but the rise of sovereign wealth positions, private equity co-investments, and shared sponsor parents has created adjacency risk. Aramco sponsors Aston Martin and previously backed the sport itself. LVMH holds relationships across the paddock. Brown's concern, shared quietly by two other team principals, is that a diversified holding company could establish board seats or profit-sharing mechanisms at two teams without triggering a "control" threshold. The FIA's current regulations define control by voting rights and management authority but don't address passive revenue stakes or shared advisory structures. Brown wants the language tightened before an eleventh team enters, which would dilute prize money and increase the risk of coordinated strategy.

The regulatory ask also serves McLaren's commercial position. The Woking team, valued by advisors near $850 million, operates without a works engine partnership and relies on sponsorship density to compete. Bahrain's Mumtalakat sovereign fund owns the team outright. If a competitor gains structural advantages through networked ownership—say, shared aero consultants or coordinated driver development funded by a multi-team backer—McLaren's independent model loses margin. Brown has spent two years arguing that F1's cost cap should extend to capital expenditures, a position that failed. This letter is narrower: stop ownership overlap before it starts.

Three things happen next. The FIA's World Motor Sport Council meets in late April, where regulatory amendments can be tabled if six teams petition in writing. Brown's letter alone won't trigger that threshold, but if Red Bull, Mercedes, or Ferrari co-sign, the proposal moves. Second, the $450 million anti-dilution payment for an eleventh team comes due if Andretti or another applicant clears the FIA's technical review by June, creating a forcing function for ownership-structure clarity. Third, Renault will either sell Alpine or commit to 2026; CEO Luca de Meo's next board meeting is in May, and the $900 million offer number will either rise or the buyer walks. If a sale closes, the new owner's cap table will set precedent for what the FIA tolerates in cross-grid exposure.

Ferrari's $1 billion valuation won't be the last. The number marks the moment team ownership became a liquid asset class with defensible comps, not a vanity stake justified by marketing budgets. Brown's letter is the fine print.