San Mateo, Calif.—Marketing automation company Marketo Inc. plans to go public sometime this year. The IPO is expected following a review by the U.S. Securities and Exchange Commission of papers filed this week, the company said in a statement. The move signals a continuing maturing of, and interest in, the marketing automation sector. Last summer, Eloqua Inc. went public and in December was acquired by Oracle Corp. In September, Pardot was acquired by interactive marketing services provider ExactTarget Inc.