Select Sector SPDRs are unique ETFs that divide the S&P 500 into eleven sector index funds. So now you can customize your investments by picking and weighting these sectors to meet your specific investment goals. Select Sector SPDRs have the diversification of a mutual fund, the focus of a sector fund, and the tradability of a stock. You can buy or sell Select Sector SPDR shares on NYSE Arca throughout the trading day.