Zenefits Raises Money (Again), Landing $4 Billion Valuation

Zenefits, a fast-growing software-as-a-service start-up raises $500 million in funding at a $4 billion valuation.
from BWCWeb http://bits.blogs.nytimes.com/2015/05/06/zenefits-raises-money-again-landing-4-billion-valuation/?_r=1