Warren Buffett speaks onstage
Warren Buffett speaks onstage during Fortune's Most Powerful Women Summit at the Mandarin Oriental Hotel on October 13, 2015 in Washington, DC.
  • Warren Buffett owns an under-the-radar stock portfolio worth more than $5 billion through Berkshire Hathaway.
  • New England Asset Management portfolio is a subsidiary of General Re, which Berkshire bought for $22 billion in 1998.
  • NEAM made strikingly similar trades to Buffett in the fourth quarter. These are its top 10 holdings.

Billionaire investor Warren Buffett owns an under-the-radar stock portfolio that made trades that were strikingly similar to the trades of Berkshire Hathaway last quarter.