The bid battle for oil field services company Expro International Group Plc continued on Friday as a group of buyers led by Candover Partners Ltd, countered a bid from oil field contractor Halliburton Co.

Candover, Goldman Sachs Group Inc and others raised their offer to 1,550 pence ($30.71) per share. That bid topped a previous 1,525 pence bid from Halliburton.

The initial offer by the Candover group on April 17 for U.K.-based Expro was 1,435 pence.

Expro provides services and products that measure, improve, control and process flow from oil and gas wells.

United kingdom Investment Goldman sachs