The voice analysis software producer has added $4.1m to the $15m it raised in November from backers including Salesforce Ventures.

US-based voice-analysis technology developer Cogito has added $4.1m to increase a series B round featuring enterprise software provider Salesforce.com’s corporate venturing unit, Salesforce Ventures, to $19.1m, according to a securities filing.

The round’s $15m first tranche, which closed in November 2016, was led by OpenView with participation from fellow venture capital firm Romulus Capital. Cogito has not revealed the identity of the investors that provided the additional funding.

Founded in 2007 as a spinout of Massachusetts Institute of Technology…