The European Union probe into potential energy-price manipulation has made no adverse findings against Royal Dutch Shell PLC (RDSB.LN), the company's chief executive Peter Voser said Tuesday.

European antitrust regulators raided the offices of Shell last week, as well as those of BP PLC (BP), Statoil ASA (STO) and price-index firm Platts, a division of McGraw Hill Financial Inc. (MHFI).

"At this stage it's just an investigation into facts and evidence and no adverse findings have been made," Mr. Voser said at the company's annual general meeting.

Shell strives to achieve the highest standards of corporate behavior and any allegations of oil price manipulation would be, "against everything we believe in at Shell," he added.