Second Harvest is audited annually and spends 0.8% of its budget on administrative expenses, 3.4% on fundraising and 95.7% on operating hunger-relief programs. Second Harvest can provide 3 meals with every $1 donation. Charity Navigator confirms that 95.6% of funds are spent on programs. For additional third-party evaluation, check out GuideStar. 
Annual Report FY17
Donor Privacy Information
2016-2017 Audited Financial Statement
2016 Form 990 (inc FY17)