SHANGHAI, Mar 28 – Recently, after Buffett's Berkshire Hathaway (BRK.A.US) increased its holdings by nearly 3.7 million shares, it increased its shareholding in Occidental Petroleum (OXY.US) to about 23.6%. The acquisition, which Berkshire disclosed in a filing with the U.S. Securities and Exchange Commission late Monday, cost about $216 million and took place on March 23 and 27.



