Buffett continues to increase his holdings in Western Oil to over 27%. According to a filing submitted by Berkshire Hathaway to the Securities and Exchange Commission (SEC) on Wednesday Eastern Time, Berkshire Hathaway has increased its holdings in Western Oil stocks for three consecutive days this week. Berkshire has acquired nearly 10.5 million shares of Western Oil Company for approximately $588.7 million this week. After this increase in holdings, Berkshire's holdings of Western Oil stocks increased to 238 million shares, with a shareholding ratio of over 27.13% and a total market value of approximately 13.648 billion US dollars.