Among the largest underlying components of IBB, in trading today Amgen Incorporated ( AMGN) is down about 0.8%, and Pharmasset Incorporated ( VRUS) is up by about 4.2%.

FORBES: Betting On Biotech

Among the largest underlying components of IBB, in trading today Amgen Incorporated ( AMGN) is down about 1.6%, and Pharmasset Incorporated ( VRUS) is lower by about 0.9%.

FORBES: Giving Biotech The Boot

Among the largest underlying components of IBB, in trading today Amgen Incorporated ( NASD: AMGN) is up about 0.6%, Pharmasset Incorporated ( NASD: VRUS) is off about 0.1%, and Celgene Corporation ( NASD: CELG) is up by about 1.8%.

FORBES: Biotech Fund Sees Outflows -- AMGN, VRUS, CELG In Focus