The bolt-on is the second for Solid Solutions, in which the BGF took a minority stake in March 2016.
Sucheta Nadkarni of Cambridge’s Judge Business School will head Level 20’s investigation into the career paths of women in private equity.
Sewtec designs automated manufacturing systems for clients in sectors including food, pharmaceuticals and consumer products.
The deal values Opus 2 at between £60m and £80m.
The deal values Bogballe at around DKr500m (€62.7m). The company was founded by Anders Peter Laursen in the 1930s.
Oak Hill Capital Partners acquired managed services business Pulsant from Bridgepoint in 2014 for £200m.