Wyle Laboratories, a provider of engineering and technical services to the US government, is in the final stages of a sale process worth about $600m that could be completed by the end of this month.

California-based Wyle, which is owned by US private equity firm Littlejohn, has been scouted by a range of buyers since its advisers at Moelis & Co launched an auction for the company several months ago, according to people close to the process.