Can you have too much of a good thing? Maybe so. Warren Buffett, though, doesn't seem to fully agree with that philosophy.

Buffett keeps buying one stock hand over fist for Berkshire Hathaway's (NYSE: BRK.A) (NYSE: BRK.B) portfolio. Yesterday, Berkshire revealed via a regulatory filing that it invested an additional $122.1 million in Occidental Petroleum (NYSE: OXY) over a three-day period.

The latest purchase means Berkshire's stake in Occidental now exceeds 25% of all outstanding shares. The oil stock ranks as the sixth-largest holding in Berkshire's portfolio. But that wasn't always the case. 

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Source Fool.com