Portico preserves ebooks from more than 70 university presses as well as independent not-for-profit organizations that are in the Books at JSTOR program. Below is the full list of Books at JSTOR publishers participating in Portico:

American Schools of Oriental Research
The American University in Cairo Press
Amsterdam University Press
The Aspen Institute
Augsburg Fortress Publishers
Australian National University
Boydell & Brewer
Casemate Publishers and Book Distributors
Catholic University of America Press
Central European University Press
Centro de Estudios Literarios ‘Antonio Cornejo Polar
Columbia University Press
Cornell University Press
Edinburgh University Press
Editions De Boccard
Editorial Gedisa
Facultad de Ciencias Sociales, Universidad de los Andes
FLACSO-Mexico
Fundação de Apoio à Universidade Federal de São Paulo
Georgetown University Press
Harvard University Press
Hebrew Union College – Jewish Institute of Religion Press
Hong Kong University Press
Independent Publishers Group
INSTAP Academic Press
Instituto Darwinion
Instituto de Estudios Avanzados de La Universidad de Santiago de Chile
Instituto de Estudios Peruanos
Leuven University Press
Malaysian Forestry Research and Development Board
Marcial Pons Ediciones de Historia, S L.
Mathematical Association of America
McGill-Queen’s University Press
Modern Humanities Research Association
Naturohistoriches Museum
Ned Ediciones
NYU Press
Ohio University Press
Open Book Publishers
Penn State University Press
Plant Gateway Ltd.
Pluto Press
Pontificia Universidad Catolica de Chile
Practical Action Publishing Ltd.
Princeton University Press
Purdue University Press
Quodlibet Srl
RAND Corporation
Russell Sage Foundation
Siglo del Hombre Editores S.A.
Society of Biblical Literature
Trama Editorial
Universidad Colegio Mayor de Nuestra Senora del Rosario
University of Arizona Press
University of California Press
University of Georgia Press
University of Massachusetts Press
University of Michigan Press
University of Minnesota Press
University of North Carolina Press
University of Ottawa Press
University of Pennsylvania Press
University of Sydney
University of Texas Press
University of Virginia Press
University Press of Colorado
University Press of Kansas
University Press of Kentucky
University Press of Mississippi
UNSW Press
Yale University Press