Billionaire Warren Buffett's Trading Activity Will Be Revealed This Week: Here Are 4 Stocks We Already Know He's Buying or Selling

The Oracle of Omaha scooped up shares of three stocks -- including two legal monopolies -- and dumped close to $1.3 billion worth of another during the December-ended quarter.You might not realize it, but this could arguably be described as the most important week of data on Wall Street for the first quarter -- and this has nothing to do with the steady stream of operating results being announced by the stock market's most-influential businesses.Friday, Feb. 14, marks the deadline for institutional investor ...