Chesapeake Energy Corp. /zigman2/quotes/201364537/composite CHK -1.53% said Tuesday it entered into a privately negotiated agreement to issue a total of 250.7 million shares of common stock in exchange for senior notes and convertible preferred stock. the stock slumped 2.1% in premarket trading. "We had an opportunity to partner with a large, multi-asset investment manager who believes in the long-term value of our common shares and, in doing so, retired a portion of our debt and preferred stock at a significant discount to its par value and reduced our annual interest and preferred dividend payments by approximately $35 million," said the oil and gas company's chief executive, Doug Lawler. The common stock issuance represents 15.3% of the 1.63 billion shares outstanding as of July 31. The stock will be exchanged for $40 million in 5.75% convertible preferred stock, $112.7 million in 4.875% senior notes due 2022, $129.3 million in 5.75% senior notes due 2023, $155.8 million in 5.5% convertible senior notes due 2026 and $150 million in 8.0% senior notes due 2027. The stock has shed 10.0% year to date through Monday, while the SPDR Energy Select Sector ETF /zigman2/quotes/206420077/composite XLE -0.52% has gained 5.0% and the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.39% has rallied 18.8%.