Mercer Marketplace no longer supports Internet Explorer version 9 (IE9) for security and reliability reasons. To enroll in your benefits you will need to use Chrome or Firefox and then click the red LOGIN HERE button. If you are in IE9 you will need to exit and go to www.MyPetcoBenefits.com in Chrome or Firefox. Enrollment can also be completed via phone by contacting the Petco Benefits Service Center at 866-502-3862.