IBB biotech sub-sector of the health care industry, serving up access to a group IBB is primarily focused on U.S. stocks, though a smattering of international firms adds some degree of international diversification. This biotech ETF casts a considerably wider net that the other ETF options for exposure to the space, investing in more than 100 stocks. That feature can be particularly important in the biotech space, where company-specific developments can send a single stock soaring. IBB is somewhat top-heavy, but generally