The company’s existing backers Maverick Capital and Venrock also participated in the round.
As a result of the investment, Andreessen general partner and SuccessFactors founder Lars Dalgaard will join the company’s board.
“I have personally met half of the people who make HR buying decisions, and I can say they all want what Zenefits offers,” said Dalgaard, according to GigaOM.
Earlier this month it was reported that Andreessen Horowitz was seeking $1.5bn for its fourth fund.
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