• by Laurie Sullivan  @lauriesullivan, February 14, 2013

Marin Software, founded in 2006 and now one of the biggest independent search ad firms, has filed an S-1 for an initial public offering (IPO) that could raise $75 million. The company had $42.5 million in revenue during the first nine months of 2012, up from $24.7 million in the year-ago period, according to the filing. In late December, Marin CEO Chris Lien told MediaPost the company had to accomplish several tasks before going public, such as preparing to adhere to Sarbanes-Oxley accounting principles. Typically, it takes another three months following a filing before the company can trade on an exchange.