warren buffett’s berkshire hathaway disclosed the purchase of another large block of occidental petroleum stock berkshire hathaway ticker brkb  paid 250 million from july 11 through 13 for a total of 43 million more shares of oil giant occidental petroleum  oxy  according to a form buffett’s firm filed with the securities and exchange commission the latest buy in a recent tear of purchases now puts the occidental investment at 1797 million shares a 192 stake based on an average of 9367 million shares outstanding on a diluted basis as of march 31 occidental shares have doubled in value this year but they have underperformed the general market as of late a swoon in the energy sector has seen occidental stock slide 16 from may 31 through wednesday’s close the sp 500 index for comparison fell 8 over the same period berkshire hathaway also owns 10 billion of occidental preferred stock paying an 8 dividend that it purchased in 2019 berkshire hathaway holds warrants to purchase 839 million occidental common shares at an exercise price of 5962 those warrants now are out of the money inside scoop is a regular barron’s feature covering stock transactions by corporate executives and board members—socalled insiders—as well as large shareholders politicians and other prominent figures due to their insider status these investors are required to disclose stock trades with the securities and exchange commission or other regulatory groups write to ed lin at edwardlinbarronscom and follow barronsedlin