Clients of individual C3 team members and collaborative C3 projects include:   

Companies and Corporate Foundations

Chiquita Brands International
Cone Communications
Genentech
Hitachi Foundation
Levi Strauss & Co.
Marriott
Nike
Target Corporation
Unocal
Washington Mutual
YM Magazine

Private Foundations

The California Endowment
Cosmetic Executive Women Foundation
EMPower Foundation
Evelyn and Walter Haas, Jr. Fund
Hyde Family Foundations
The James Irvine Foundation
Paul Getty Trust, Getty Institute for Education in the Arts
Marin Community Foundation
Miriam and Peter Haas Fund
Ms. Foundation for Women
The Open Society Institute
The David and Lucile Packard Foundation
The Russell Family Foundation
The San Francisco Foundation
Stuart Foundation
Team-up For Youth Foundation 

Non-Profits

Aspen Institute Initiative for Social Innovation through Business
Asian Americans/Pacific Islanders in Philanthropy
Business for Social Responsibility
The Foundation Incubator
Friends of the San Francisco Public Library
Marin AIDS Project
Rockefeller Philanthropy Advisors
Women's Funding Network