Specifically:

Alcor Life Extension Foundation and the American Cryonics Society (ACS) are organized as 501(c)3 charitable organizations, whereas the Cryonics Institute (CI) is simply a non-profit corporation. Although Suspended Animation, Inc. (SA) is ostensibly a for-profit company, it is mainly engaged in research and development of cryonics capabilities financed by the principals of the Life Extension Foundation.

— http://www.cryonics.org/comparisons.html