Catamaran 10-K 2007 FY Annual report

EXHIBIT 21.1

List of Subsidiaries

Subsidiary	Province/State of Incorporation	D/B/A
1131836 Ontario Inc.	Ontario
SXC Health Solutions, Inc. (formerly named Systems Xcellence USA, Inc.)	TX	SXC
Health Business Systems, Inc.	PA	HBS HBS, Inc. HBS, an SXC Company
InformedRx, Inc. (formerly named HxBenefit, Inc.)	AZ	InformedRx, an SXC Company