EX-99.906 Certification Pursuant to Rule 30a-2(b) under the 1940 Act and Section 906 of the Sarbanes-Oxley Act I, Earle A. Malm II, President of HighMark Funds (the "Registrant"), certify that: 1. The Form N-CSR of the Registrant (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Date: October 7, 2011 /s/ Earle A. Malm II ---------------------- --------------------------------------------- Earle A. Malm II, President (principal executive officer) I, Pamela O'Donnell, Chief Financial Officer of HighMark Funds (the "Registrant"), certify that: 1. The Form N-CSR of the Registrant (the "Report") fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and 2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant. Date: October 7, 2011 /s/ Pamela O'Donnell ---------------------- --------------------------------------------- Pamela O'Donnell, Chief Financial Officer (principal financial officer)