Top executives of Delft Instruments, the Dutch-listed technology group, will own stakes in the company valued at almost €17m ($21m) as a result of a €152m buyout from AlpInvest Partners, the private equity firm.

Bert de Groot, Delft chief executive, Mark Dekker, its finance director, and 20 other senior managers will acquire 11% of the company's ordinary shares valued at €17m.