Top Holdings in XTL Include Telecom Giants as Fund Tracks Industry Index The SPDR S&P Telecom ETF’s largest positions feature AT&T, Verizon, and T-Mobile US, among others. The ETF employs a sampling strategy to track the S&P Telecom Select Industry Index, investing at least 80% of assets in index securities, and was launched in 2011 by State Street Global Advisors.45