Berkshire Hathaway unloads Exxon Mobil, ConocoPhillips stakes as oil prices fall, adds Deere

Billionaire Warren Buffett's company unloaded its 41 million shares of Exxon Mobil Corp. and sold a smaller stake in ConocoPhillips as oil prices fell last fall.

Berkshire Hathaway Inc. filed an update on the stocks it held at the end of 2014 with the Securities and Exchange Commission Tuesday.

Berkshire recorded a number of moves during the last three months of last year, including buying 15.6 million shares of Deere & Co. stock and adding nearly 6.5 million shares to its already sizeable IBM holdings.

Many investors watch the filings closely because they like to copy Buffett's moves because of his remarkably successful record.

But Berkshire's combined filing includes investments made by two other executives at the company, so it's not always clear whether Buffett made the decisions.