McLaren has completed an agreement to acquire a majority shareholding of the Arrow McLaren SP IndyCar team.
In August, McLaren announced its intention to bring its IndyCar effort fully under the McLaren Racing banner.
Through Pato O'Ward, the team finished third in the drivers' standings this year with the Mexican registering two race wins.
The agreement sees McLaren take a 70 per cent controlling stake in the team with Zak Brown chairing a new five-person board alongside Sam Schmidt and Ric Peterson.
President of Arrow McLaren SP, Taylor Kiel, will be accountable for the overall operation and performance of the team.
When announcing McLaren's intent to secure the majority shareholding in the team earlier this year, Brown described the move as "a strong signal of our long-term commitment to IndyCar as both a racing series and a marketing platform for McLaren Racing."
McLaren Racing is now represented on three fronts with IndyCar and Extreme E backing the team's F1 efforts.
With Brown previously having expressed an interest in both Formula E and the World Endurance Championship, it is not impossible the team could still look to add to its portfolio.