Kidman Resources managing director Martin Donohue says he ceased involvement with the sixth biggest shareholder in Kidman before it started building a stake in the lithium aspirant that is now worth more than $15 million.

Mr Donohue was a founding director and founding shareholder of the company, now known as Commodity House Pty Ltd, but his connection to the company as director and owner ceased in July 2014; more than a month before Commodity House started building its stake in Kidman.