The Rubicon Project Inc., a Los Angeles digital advertising platform, is turning to Gibson, Dunn & Crutcher for advice on its $100 million initial public offering, according to the S-1 it filed Wednesday. Wilson Sonsini Goodrich & Rosati is counseling the underwriters, which include Morgan Stanley, Goldman Sachs and RBC Capital Markets.

Founded in 2007, the company brings together and facilitates trading between buyers and sellers of online ads, which are viewed by 550 million users across the world and 96 percent of U.S. Internet users. The company reported $55.7 million in revenue and $9.2 million in net loss for the nine months ended Sept. 30.