University of Minnesota spinout Flipgrid has been acquired by Microsoft for an undisclosed sum, three years after raising $17m.

MIT spinout and automated statistics technology developer Empirical Systems had raised $2.5m from investors including Hyperplane Venture Capital and Brain Robotics Capital.

Aviva Ventures has exited home improvement services marketplace Opun in a $4.7m purchase by John Lewis Partnership.

JF Shea-backed VictorOps agreed to acquisition by Splunk for approximately $120m in cash and stock.

The acquisition comes less than a month after Adaptive Insights, whose shareholders include Salesforce, filed for a $100m initial public offering.

Abry has acquired cinema marketing distributor Screenvision for $380m in a deal which bagged AMC Entertainment a $45m return.

Freight brokerage GlobalTranz will be acquired by private equity firm Jordan Company after raising $50m from two rounds in 2014 and 2011.

Siemens has celebrated an exit as Thoma Bravo acquired its portfolio company LogRhythm, which had raised more than $121m from investors.