EX-99.906CERT 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: 9/27/09 /s/ EARLE A. MALM II ---------------------------- ------------------------------------------ Earle A. Malm II, President (principal executive officer) I, Colleen Cummings, 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: 9/27/09 /s/ COLLEEN CUMMINGS ---------------------------- ------------------------------------------ Colleen Cummings, Chief Financial Officer (principal financial officer)