Pindrop Security, a US-based provider of phone fraud prevention and call centre authentication services, secured $35m in a series B round featuring Citi Ventures, the corporate venturing arm of financial services company Citigroup, yesterday.

Institutional Venture Partners led the round, with Andreessen Horowitz, Felicis Ventures, Redpoint Ventures and Webb Investment Network also participating.

Pindrop previously received $11m in a 2013 series A round led by Citi Ventures and Andreessen Horowitz. Redpoint, Felicis and Webb also invested in that round.

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