Chesapeake Energy (CHK)

$500 MILLION CUMULATIVE CONVERTIBLE PREFERRED STOCK

OKLAHOMA CITY, OKLAHOMA, NOVEMBER 1, 2005 – Chesapeake Energy Corporation (NYSE:CHK) today announced that it is commencing a private placement offering to eligible purchasers of $500 million of a new series of its cumulative convertible preferred stock with a liquidation preference of $100 per share. The offering is expected to be eligible for resale under Rule 144A. The private offering, which is subject to market and other conditions, will be made only to qualified institutional buyers.

Chesapeake intends to use the net proceeds of the offering, together with proceeds from concurrent private offerings of senior notes and senior contingent convertible notes, to partially fund its recently announced acquisition of Columbia Natural Resources, LLC for $2.2 billion in cash.

The company also intends to grant a 30-day option to the initial purchasers to purchase a maximum of $75 million in additional shares of convertible preferred stock.

The preferred stock has not been registered under the Securities Act of 1933 or applicable state securities laws, and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act and applicable state laws. This announcement shall not constitute an offer to sell or a solicitation of an offer to buy the preferred stock.

This document contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements include estimates and give our current expectations or forecasts of future events. Although we believe our forward-looking statements are reasonable, they can be affected by inaccurate assumptions or by known or unknown risks and uncertainties.

Pro forma for its acquisition of Columbia Natural Resources, LLC and its affiliates, Chesapeake Energy Corporation is the second largest independent producer of natural gas 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, Permian Basin, South Texas, Texas Gulf Coast, Barnett Shale, Ark-La-Tex and, most recently, the Appalachian Basin regions of the United States.

$250 MILLION CUMULATIVE CONVERTIBLE PREFERRED STOCK

OKLAHOMA CITY, OKLAHOMA, SEPTEMBER 7, 2005 – Chesapeake Energy Corporation (NYSE:CHK) today announced that it intends to commence a public offering of $250 million of a new series of its cumulative convertible preferred stock with a liquidation preference of $100 per share. Chesapeake intends to use the net proceeds of the offering, together with the proceeds from a concurrent offering of common stock, to repay debt under its bank credit facility or for general corporate purposes.

The offering will be made under the company’s existing shelf registration statement. The company intends to grant underwriters a 30-day option to purchase a maximum of $37.5 million in additional shares of convertible preferred stock to cover any over-allotments in the offering.

Lehman Brothers, Banc of America Securities LLC, Credit Suisse First Boston, Morgan Stanley and Wachovia Securities will be joint book-running managers for the offering. Copies of the preliminary prospectus and records relating to the offering may be obtained from the offices of Lehman Brothers Inc., c/o ADP Financial Services, Integrated Distribution Services, 1155 Long Island Avenue, Edgewood, NY 11717; Banc of America Securities LLC, Attn: Prospectus Department, 100 West 33^rd Street, New York, NY 10001, 646-733-4166; Credit Suisse First Boston, One Madison Avenue, Level 1B, New York, NY 10010, 212-325-2580; Morgan Stanley, Prospectus Department, 1585 Broadway, LLB, New York, NY 10036; Wachovia Securities Capital Markets, LLC, Equity Capital Markets, 7 St. Paul Street, 1^st Floor, Baltimore, MD 21202.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any state.

This document contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. Forward-looking statements include estimates and give our current expectations or forecasts of future events. Although we believe our forward-looking statements are reasonable, they can be affected by inaccurate assumptions or by known or unknown risks and uncertainties.

Chesapeake Energy Corporation is the third largest independent producer of natural gas in the U.S. Headquartered in Oklahoma City, the company's operations are focused on exploratory and developmental drilling and producing property acquisitions in the Mid-Continent, Permian Basin, South Texas, Texas Gulf Coast, Barnett Shale and Ark-La-Tex regions of the United States.