Three shareholding banks have brought a case disputing the validity of the appointment of two directors to the board of Formula One Holdings (FOH).
But after two days of legal argument the judge said he would hand down his judgment later in the year, reports Reuters.
Bayerische Landesbank, JP Morgan and Lehman Brothers control 75 per cent of the SLEC holding company that owns the commercial rights to Formula One.
The other 25 per cent is owned by Bambino Holdings, an Ecclestone family trust.
SLEC owns FOH. The banks are contesting the appointment to the FOH board of Luc Argand and Emmanuele Argand-Rey two years ago, arguing that although the banks own the majority of the shares they do not have control because of the board's composition.
Lawyers for the banks, who acquired their stake in Formula One after Germany's Kirch media empire collapsed, had asked the judge for a "summary judgment" in the case.
The case is being closely watched by major carmakers that have threatened to set up their own 'rival' series from 2008 via GPWC Holdings.
