Catamaran (CTRX) used to be known as SXC Health Solutions until July 2012 but it has been revolutionizing the Pharmacy Benefit Management (PBM) segment of the health care industry for years.

FORBES: How Catamaran is Revolutionizing Pharmacy Benefit Management

Among the largest underlying components of VSS, in trading today Catamaran Corp ( NASD: CTRX) is down about 1%, Baytex Energy Corp ( NYSE: BTE) is off about 0.7%, and New Gold Inc. ( AMEX: NGD) is higher by about 0.7%.

FORBES: Noteworthy ETF Inflows: VSS, CTRX, BTE, NGD