The Abu Dhabi-based niche offshore outfit priced the offering at 135p ($2.24) per share, valuing the company at GBP 472m ($784m), it said today in a regulatory filing.
However the price was at the bottom end of the range it had sought which stretched to 170p per share.
GMS began conditional trading in London today though shares will be listed on the mainboard from 19 March.
Duncan