Cytokine, here is the list of companies in BTK (from amex.com ):
Index ComponentsThe Biotechnology Index is composed of shares of the following issues:ÿAdvanced Tissue Life Sciences(ATIS)Genzyme Corporation (GENZ)ÿAmgen Inc. (AMGN)Gilead Sciences Inc. (GILD)ÿBiogen, Inc.(BGEN)Immune Response Corporation(IMNR)ÿBio-Technology General Corp.(BTGC)Immunex Corporation(IMNX)ÿCentocor Inc. (CNTO)Organogenesis Inc. (ORG)ÿCephalon, Inc. (CEPH)Protein Design Labs, Inc. (PDLI)ÿChiron Corporation (CHIR)Vertex Pharmaceuticals, Inc.(VRTX)ÿCOR Therapeutics, Inc. (CORR)ÿ
In theory, IXB is more representative, but in practice, because it is capitalization-weighted (BTK is readjusted every quarter to keep it dollar-weighted), it ends up reflecting Amgen, Genzyme, Biogen and little else. OTOH since BTK has so few companies good or bad news in a given company, for example CORR a few weeks ago, can have a huge effect.
I find both indices useful.
PB |
