I have been putting together my own categorizations for stock sectors, but this is a TEDIOUS task and was hoping someone had found some good sites on the web that i could reference. For example, not just biotech sector, that is easy. Rather who does RNAi, Biodefense, Stem Cells, Neuromodulation etc. Even better is a list like that and a mention of pure play VS conglomerates. Some 300M biotech may do RNAi as well as Pfizer. perhaps a close competitor correlation. Is there such a place that provides this kind of information and does not charge a lot (or hopefully Free). I am sure there are places but user friendly or able to export data would be good too. Thanks, Genomik