Revenues at Wendel Investissement rose 7% to €2.63bn ($3.6bn) in the first half of the year, as the French buyout firm prepared to book gains later this year through a stock market listing of business services and certification group Bureau Veritas, the largest company in its portfolio.

Consolidated revenues, which comprise the sales of all of Wendel's portfolio, rose at six of the eight companies under its ownership compared with same period a year earlier.