Zendesk, a customer service SaaS provider with over 40,000 client accounts, filed on Thursday with the SEC to raise up to $150 million in an initial public offering. The San Francisco, CA-based company, which was founded in 2007 and booked $72 million in sales for the fiscal year ended December 31, 2013, plans to list on the NYSE under the symbol ZEN. Zendesk initially filed confidentially on February 14, 2014. Goldman Sachs, Morgan Stanley and Credit Suisse are the joint bookrunners on the deal. No pricing terms were disclosed.