McLaren driver Oscar Piastri has split with the management team headed by ex-Formula 1 driver Mark Webber.
Webber and his partner Ann Neal had managed Piastri's career since 2019, helping him negotiate his route to F1 by leaving the Alpine junior team and signing with McLaren.
Webber, who started 217 grands prix in his own career, had already reduced his presence trackside this year and a statement indicated a mutual decision had been reached to part ways.
"Following our reduced trackside involvement this season, we have collectively agreed that now is an appropriate time to bring our management agreement to a close," Webber said.
"This will allow Oscar to build on his achievements under a new management structure, and for us to embark on our new ventures. We wish Oscar all the very best for a long and successful career."
Piastri thanked Webber for his involvement in his career to date.
"I'd like to thank Mark and Ann for all their support and advice over the years," he said. "Their guidance has been invaluable, particularly in navigating the beginning of my F1 career.
"I wish them all the best going forward."
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Piastri came within 13 points of becoming world champion last year in a tense battle for the title with teammate Lando Norris and Red Bull's Max Verstappen.
Now in his fourth season in F1, Piastri made his debut with McLaren after Alpine left a contractual door open for him to leave its junior programme in 2023.
The dispute went to an employment tribunal in late 2022, which ruled in Mclaren's favour allowing Piastri to join the team as Daniel Ricciardo's replacement.
Piastri is currently seventh in the drivers' standings with two podiums this season.