Recent years have seen an increase in car manufacturer presence in the sport. After Honda's return as an engine manufacturer in 2015, Renault came back as a team in 2016 after buying back the Lotus F1 team. In 2018, Aston Martin and Alfa Romeo became Red Bull and Sauber's title sponsors, respectively. Sauber was rebranded as Alfa Romeo Racing for the 2019 season, while Racing Point part-owner Lawrence Stroll bought a stake in Aston Martin to rebrand the Racing Point team as Aston Martin for 2021. In August 2020, a new Concorde Agreement was signed by all ten F1 teams committing them to the sport until 2025, including a $145M budget cap for car development to support equal competition and sustainable development in the future.