Big in what sense? I used one metric, market cap, and AAPL, AMZN, MSFT, GOOG, FB wipe the floor with the 100 year old company. Even in profits At&t is not close to overpowering big tech. So I asked, why then is ATT winning the lobbying battles?
Where are you getting your data? AT&T market cap is over 200B, _before_ Time Warner merger. Plus this data fails to take into account the infrastructure holdings and government contracts they have, which are enormous.