Buffett's Berkshire Hathaway has bought even more shares of Occidental Petroleum

Berkshire Hathaway confirmed this week it had bought more shares of Occidental Petroleum.

Has a stake in the firm now above 25%.

You may recall from back in early April:

• More on Warren Buffett intending to add to Japanese stock holdings

And the Nikkei since:

Will Buffett have the Midas touch in oil too?