The Bank of New York Mellon Corporation, a global financial services company, and the Goldman Sachs Group, Inc. (NYSE: GS) ...

Acquiring CSX would be expensive for Berkshire, but it would still be accretive to its earnings, one analyst calculated.

Inside the financial sector, the iShares U.S. Broker-Dealer & Securities Exchanges exchange-traded fund is stealing the spotlight. Goldman is the stock to watch.