Occidental Trades Fuel Speculation About Berkshire

Amid a selloff in the energy sector,


Occidental Petroleum


shares are down to their lowest levels since late September, when


Berkshire Hathaway


made its most recent purchases of the oil and gas company.

Occidental shares (ticker: OXY) were down 1.5% to 59.82 in Tuesday’s session after falling 2.8% Friday.