zendesk inc has closed a 102 billion allcash acquisition deal with a group of buyout firms led by hellman  friedman llc and permira under the terms of the agreement zendesk stockholders will receive 7750 a share a roughly 34 premium to thursdays closing price of 5795 the wall street journal reported thursday that the software company was closing in on what would be one of the biggest privateequity takeovers of the year zendesk had been expected to strike a settlement agreement with activist investor jana partners llc days after the company ended a bid to sell itself in a privateequity auction