What were the companies that comprises G.Bush and Cheney's tax return earnings?

Answer 1

At this point they don't even know because everything was put in a blind trust six years ago when they were elected. The Trustee could have, although not likely, sold everything and bought stock in new companies. Their returns, which are normally made public, will only show income from the trust and the US government.

Answer 2

Any stock holdings are in blind trusts. Legally, even they don't know though it wouldn't be much of a stretch to flag Halliburton as a key component of Mr Cheney's holdings given that he had significant holdings from when he was CEO. Their pay is from the US Government.