Seven female heirs in the Wilhelmsen family are fed up with the power in the family shipping company still being vested in just one man.
They are offering roughly NOK 3.2bn ($353m) to get rid of chief executive Thomas Wilhelmsen.
The power struggle for the empire worth billions and thereby for control of the Wilh Wilhelmsen Holding shipping company came to a head after shipowner Wilhelm Wilhelmsen died in February.