Stocks in the news: Burlington Northern, Johnson & Johnson, Black & Decker

Berkshire Hathaway (BRK.A), Warren Buffett's company, announced Tuesday morning that it will buy the remaining 77.4 percent that it does not already own in railroad giant Burlington Northern Santa Fe (BNI) for $100 a share in cash and stock. The deal is valued at approximately $44 billion, including $10 billion of outstanding BNSF debt, making it the largest acquisition in Berkshire Hathaway's history. BNI shares popped nearly 30 percent in premarket trading.

Johnson & Johnson (JNJ) announced several restructuring moves Tuesday, including cutting its workforce of nearly 120,000 employees by up to 7 percent. J&J will take other restructuring moves in order to save up to $900 million next year. While the job cuts prompted a restructuring charge of up to $1.3 billion pretax in the fourth quarter, J&J confirmed guidance. JNJ shares climbed some 2 percent ahead of the bell.