Shareholders embroiled in a class action lawsuit against Aegean Marine Petroleum Network's former officers and auditors are moving to block parts of the bankrupt bunkerer's reorganisation plan.

In court papers filed Tuesday, lead plaintiff Utah Retirement Systems alleges part of the plan makes their securities fraud lawsuit against founder Dimitris Melissanidis worthless by prioritising future litigation by the New York-listed bunker supplier's unsecured creditors on the same issues.