Berkshire Hathaway Inc. sold its Occidental Petroleum Corp. common equity in the second quarter, due to its performance during the pandemic which highly affected the industry. Berkshire had built up the stake in addition to its $10 billion investment in preferred shares last year, which helped fund Occidental’s ill-fated takeover of Anadarko Petroleum Corp. Occidental tumbled 64% this year, making it the worst performer in the S&P 500 Energy Index.