The four men and two women, ranging in age between 22 and 47, will be sentenced at Northampton Crown Court on March 31st and were warned they could face imprisonment, British media reported.
Five of them ran onto the high-speed Wellington Straight after Alfa Romeo's Chinese driver, Zhou Guanyu, crashed and halted the July 3rd race.
While red flags were waved, cars were still driving back to the pit lane as marshals and police dragged the protesters away. A sixth protester was found in a car park with glue, cable ties and a Just Stop Oil banner.
All denied charges of conspiring with others to cause a public nuisance and causing a public nuisance. Prosecutors had said they had caused an immediate risk of serious harm to drivers and marshals as well as themselves.
Just Stop Oil wants Britain to stop all new oil and gas projects and has staged a number of protests including activists throwing soup over Vincent van Gogh’s painting "Sunflowers" at London's National Gallery last October.
