XLK includes market segments like IT services, wireless telecommunication services, and semiconductors to name just a few. The fund invests in the who’s-who of the U.S. tech sector, with major holdings in companies like Apple and IBM. The fund splits its assets mainly between the technology and communication services sectors, while allocating mainly to giant and large cap firms. One of the major strengths of this ETF is the fact that it does not single out a particular sector; rather it invests in companies from all across the technology sector.