The companies that experienced the reductions are: Gilead Sciences Inc. ( GILD), Biogen Idec Inc. ( BIIB), Pall Corp. ( PLL), Onyx Pharmaceuticals ( ONXX) and Regeneron Pharmaceuticals ( REGN).

FORBES: Vanguard Health Care Fund Does More Shedding than Adding in Third Quarter

Among the largest underlying components of IBB, in trading today Alexion Pharmaceuticals Inc. ( NASD: ALXN) is up about 0.1%, Biogen Idec Inc ( NASD: BIIB) is up about 0.8%, and Perrigo Company ( NASD: PRGO) is relatively unchanged.

FORBES: Notable ETF Inflow Detected - IBB, ALXN, BIIB, PRGO

Among the largest underlying components of XBI, in trading today Spectrum Pharmaceuticals Inc ( NASD: SPPI) is down about 1.9%, Onyx Pharmaceuticals, Inc. ( NASD: ONXX) is off about 1.2%, and Biogen Idec Inc ( NASD: BIIB) is lower by about 1.9%.

FORBES: XBI, SPPI, ONXX, BIIB: ETF Inflow Alert