QuinStreet, Inc. engages in performance marketplaces and technologies for the financial and home services industries. Its approach to proprietary performance marketing technologies allows clients to engage high-intent digital media or traffic from a wide range of device types, in multiple formats or types of media, and in a wide range of cost-per-action. The company was founded by Douglas Valenti on April 16, 1999 and is headquartered in Foster City, CA.