Luca di Montezemolo, also president of Ferrari and Fiat, has announced he is likely to step down as chairman of the F1 teams association FOTA at the end of the year.
FOTA's deputy chairman John Howett has also left the association, following the withdrawal from Formula One of his employer Toyota.
"FOTA wishes to put on record its thanks to John Howett for his great passion and his fundamental contribution", part of a statement issued by the Geneva based body said earlier this month.
Also with prominent FOTA roles since its inception in 2008 are Ross Brawn, the technical chairman, and sporting boss Martin Whitmarsh.
Flavio Briatore was the commercial chairman until his motor racing ban following the crash-gate scandal.
FOTA's secretary general is Simone Perillo.
Meanwhile, figures for the new F1 teams Campos and USF1 are now listed in FOTA's working groups, but there is no mention at all of Manor/Virgin.
Meanwhile, only Campos-Meta's official logo has been added to the organisation's website alongside the existing teams.