 Shares of Zendesk Inc. ZEN, 1.29 soared 29.5 in premarket trading Friday, after the customer experience platform company confirmed a deal to be acquired by an investor group that includes Permira and Hellman Friedman in an all-cash deal valued at about 10.2 billion. Under terms of the deal, the Permira and HF will pay 77.50 for each Zendesk share outstanding, which represents a 33.7 premium to Thursdays closing price of 57.95. 