Assertive Community Treatment (ACT) programs provide community-based services for individuals with severe mental illness. In Ontario, these programs are funded by the Ministry of Health and Long-Term Care and administered through sponsoring agencies (hospitals, mental health facilities, and "other" community-based organizations). This article reports on the results of a survey of ACT programs and investigates the relationship between sponsoring agency type and ACT program operations. Findings and implications for policy makers and administrators are discussed.