- The Offices of the Provost, the Dean of Humanities and Sciences, and the Dean of Research, Stanford University
- The SEP Library Fund: containing contributions from the National Endowment for the Humanities and the membership dues of academic and research libraries that have joined SEPIA.
- The John Perry Fund and The SEP Fund: containing contributions from private donors and individual readers.
- The Friends of the SEP Society Fund: containing membership dues from individuals who have joined to obtain such member benefits as nicely formatted PDF versions of SEP entries.
The SEP gratefully acknowledges founding support from the National Endowment for the Humanities, the National Science Foundation, The American Philosophical Association/Pacific Division, The Canadian Philosophical Association, and the Philosophy Documentation Center. Fundraising efforts were supported by a grant from The William and Flora Hewlett Foundation.