As filed with the Securities and Exchange Commission on October 15, 1999 Registration No. 333- - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 --------------- FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 --------------- Pennaco Energy, Inc. (Exact name of registrant as specified in its charter) Nevada 1311 88-0384598 (State or other (Primary Standard Industrial (I.R.S. Employer jurisdiction of incorporation or Classification Code Number) Identification Number) organization) --------------- 1050 17th Street, Suite 700 Denver, Colorado 80265 (303) 629-6700 (Address, including zip code, and telephone number, including area code, of Registrant's principal executive offices) Paul M. Rady, Chairman, President and Chief Executive Officer Pennaco Energy, Inc. 1050 17th Street, Suite 700 Denver, Colorado 80265 (303) 629-6700 (Name, address, including zip code, and telephone number, including area code, of agent for service) Copies to: David P. Oelman Robert A. Zuccaro Andrews & Kurth L.L.P. Latham & Watkins 600 Travis, Suite 4200 885 Third Avenue Houston, Texas 77002 New York, New York 10022 (713) 220-4200 (212) 906-1200 Approximate date of commencement of the proposed sale to the public: As soon as practicable after the effective date of this Registration Statement. --------------- If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. [_] If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of earlier effective registration statement for the same offering. [X] 333-86547 If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. [_] If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box. [_] CALCULATION OF REGISTRATION FEE - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- Title of Each Class of Shares to be Amount of Securities to be Registered Registered(1) Registration Fee(2) - -------------------------------------------------------------------------------- Common Stock, $.001 par value................ 4,025,000 $13,134 - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- (1) Includes 525,000 shares subject to Underwriters' over-allotment option. (2) Estimated solely for the purpose of calculating the registration fee in accordance with Rule 457(o). (3) The Registrant has previously paid a fee of $11,350. --------------- The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933 or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine. - -------------------------------------------------------------------------------- - -------------------------------------------------------------------------------- EXPLANATORY NOTE This Registration Statement is being filed pursuant to Rule 462(b) under the Securities Act of 1933, as amended. The contents of the Registration Statement on Form S-1 (Registration No. 333-86547) filed by Pennaco Energy, Inc. with the Securities and Exchange Commission on September 3, 1999, as amended by Amendment No. 1 thereto filed on September 28, 1999, Amendment No. 2 thereto filed on October 12, 1999 and which was declared effective on October 14, 1999, are incorporated herein by reference. SIGNATURES Pursuant to the requirements of the Securities Act of 1933 the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, to the City of Denver, State of Colorado, on the 14th day of October, 1999. Pennaco Energy, Inc. /s/ Paul M. Rady By: _________________________________ Paul M. Rady Chief Executive Officer, President and Chairman of the Board Pursuant to the requirements of the Securities Act of 1933, as amended, this registration statement has been signed by the following persons on October 14, 1999 in the capacities indicated. Name Title ---- ----- /s/ Paul M. Rady Chief Executive Officer, President and ______________________________________ Chairman of the Board Paul M. Rady /s/ Glen C. Warren, Jr. Chief Financial Officer, Executive Vice President, ______________________________________ and Director (Principal Financial and Accounting Glen C. Warren, Jr. Officer) /s/ Gregory V. Gibson Vice President, Legal, Secretary, and Director ______________________________________ Gregory V. Gibson ______________________________________ Director David W. Lanza II-7