Many investors will use the SPDR ETFs to gain broad exposure to a particular sector, but often they don't give as much thought to the underlying components of each ETF. Below is a list of the top 5 holdings of each SPDR sector ETF. In many cases the top 5 holdings can represent a huge portion of the ETF. The XLY for instance holds 30% of its portfolio in its top 5 holdings, even though it claims 80 total holdings. The bottom 5 holdings of the XLY have a combined weight of 0.77%.