1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED) JUNE 19, 2000 (JUNE 14, 2000) ------------------------------ CHESAPEAKE ENERGY CORPORATION ------------------------------------------------------------------------- (Exact name of Registrant as specified in its Charter) OKLAHOMA 1-13726 73-1395733 - ------------------------------------------------------------------------------------------------------------------ (State or other jurisdiction (Commission File No.) (IRS Employer Identification No.) of incorporation) 6100 NORTH WESTERN AVENUE, OKLAHOMA CITY, OKLAHOMA 73118 ------------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) (405) 848-8000 ----------------------------------------------------------------- (Registrant's telephone number, including area code)

2 INFORMATION TO BE INCLUDED IN THE REPORT ITEM 5. OTHER EVENTS On June 14, 2000, Chesapeake Energy Corporation ("Chesapeake") issued a press release announcing three Mid-Continent natural gas reserve purchases. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS (c) Exhibits. The following exhibit is filed herewith: 99. Press Release issued by the Registrant on June 14, 2000. 2

3 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. CHESAPEAKE ENERGY CORPORATION BY: /s/ AUBREY K. MCCLENDON ------------------------ AUBREY K. MCCLENDON Chairman of the Board and Chief Executive Officer Dated: June 19, 2000 3

4 EXHIBIT INDEX EXHIBIT NUMBER DESCRIPTION - ------ ----------- 99 Press Release issued by the Registrant on June 14, 2000. 4

1 EXHIBIT 99 CONTACT: MARC ROWLAND, CHIEF FINANCIAL OFFICER (405) 879-9232 FOR IMMEDIATE RELEASE TOM PRICE, JR.,VICE PRESIDENT- JUNE 14, 2000 CORPORATE DEVELOPMENT (405) 879-9257 CHESAPEAKE ENERGY CORPORATION ANNOUNCES THREE MID-CONTINENT NATURAL GAS RESERVE PURCHASES CHESAPEAKE CONTINUES ACQUIRING LONG-LIVED MID-CONTINENT NATURAL GAS RESERVES AT ATTRACTIVE PRICES, MOST RECENT ACQUISITIONS ARE IN OKLAHOMA'S ARKOMA BASIN OKLAHOMA CITY, OKLAHOMA - JUNE 14, 2000 - Chesapeake Energy Corporation (CHK:NYSE) today announced that during the past several weeks it has acquired estimated proved reserves of 33 billion cubic feet of natural gas (bcf) in Oklahoma's Arkoma Basin in three transactions for total consideration of $22 million. The reserves were acquired for $0.67 per thousand cubic feet of natural gas (mcf), are 100% natural gas, have a reserves-to-production index of over nine years and at unescalated prices of $2.50 per mcf and $3.50 per mcf have estimated PV-10 values of $29.8 million and $48.3 million, respectively. The properties are contiguous to or near Chesapeake's existing base of operations in eastern Oklahoma and have numerous drilling opportunities associated with them. The company plans an active drilling program on these assets during the remainder of 2000 and in the years ahead. Chesapeake funded the purchases from cash on hand. The information in this release includes certain forward-looking statements that are based on assumptions that in the future may prove not to have been accurate. Those statements, and Chesapeake Energy Corporation's business and prospects, are subject to a number of risks, including production variances from expectations, uncertainties about estimates of reserves, volatility of oil and gas prices, the need to develop and replace reserves, the substantial capital expenditures required to fund operations, environmental risks, drilling and operating risks, risks related to exploratory and developmental drilling, competition, government regulation, and the ability of the company to implement its business strategy. These and other risks are described in the company's documents and reports that are available from the United States Securities and Exchange Commission, including the report filed on Form 10-K for the year ended December 31, 1999 and the report filed on Form 10-Q for the quarter ended March 31, 2000. Chesapeake Energy Corporation is one of the 15 largest independent natural gas producers in the U.S. Headquartered in Oklahoma City, the company's operations are focused on exploratory and developmental drilling and property acquisitions in the Mid-Continent region of the United States. The company's Internet address is www.chkenergy.com.