Chesapeake Energy Corp. fell to the lowest since April 2000, making it the worst performing stock in the Standard & Poor’s 500 Index Tuesday, on investor concern that sinking oil prices would hurt the company’s ability to repay debt. The company’s stock fell 17 percent to $2.96 as of 2:46 p.m., anchoring an average 5.7 percent decline on the Standard & Poor’s 500 Oil and Gas Exploration & Production Index. “The market is not very kind to the whole group and especially to companies with high debt and very limited financial flexibility,” said Fadel Gheit, managing director of Oppenheimer & Co. ConocoPhillips was the second-worst oil and natural gas producer in the S&P Tuesday, as shares fell as much as 9.6 percent to $35.60. Chesapeake shares have plunged 84 percent in the past year as oil prices continued their drop to below $30 a barrel. The company’s started 2016 […]