SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 __________ Amendment No. 1 to FORM 8-A FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 CALGON CARBON CORPORATION (Exact name of registrant as specified in its charter) Delaware 25-0540110 (State of Incorporation or organization) (I.R.S. Employer Identification No.) P.O. Box 717, Pittsburgh, PA 15230-0717 (Address of principal executive offices) (zip code) If this form relates to the registration If this form relates to the registration of a class of securities pursuant to Section of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(c), check pursuant to General Instruction A.(d), check the following box. (X) the following box. ( ) Securities Act registration statement file number to which this form relates: N/A ------------------------------------------------------------------------------- (If applicable) Securities to be registered pursuant to Section 12(b) of the Act: Title of Each Class Name of Each Exchange on Which to be so Registered Each Class is to be Registered ------------------- ------------------------------ Common Stock Acquisition Rights New York Stock Exchange Securities to be registered pursuant to Section 12(g) of the Act: None ------------------------------------------------------------------------------- (Title of Class) Item 1. Description of Securities To Be Registered. On December 27, 2004, Calgon Carbon Corporation, a Delaware corporation (the "Company"), pursuant to approval by the Company's Board of Directors, entered into Amendment No. 2 to the Rights Agreement ("Amendment No. 2") by and between the Company and Equiserve Trust Company, N.A. (as successor to First Chicago Trust Company of New York), dated as of February 3, 1995, as amended by Amendment No. 1 thereto, dated as of April 23, 1999 (as so amended, the "Rights Agreement"). Amendment No. 2 reduces from 20% to 10% the threshold at which the Rights (as defined in the Rights Agreement) will be triggered. According to the Rights Agreement as amended, subject to certain exceptions described in the Rights Agreement, the Rights will be triggered after a person or group becomes the beneficial owner of 10% or more of the Company's outstanding common stock or commences a tender or exchange offer upon consummation of which such person or group will become the beneficial owner of 10% or more of the Company's outstanding common stock. Current holders of 10% or more of the Company's outstanding common stock will not trigger the Rights unless any such holder acquires an additional 1% of the Company's common shares or, in the case of a holder that reports its beneficial ownership on Schedule 13G, such holder increases its ownership above 15%. A copy of Amendment No. 2 has been filed with the Commission as Exhibit 4.1 to the Current Report on Form 8-K filed by the Company with the Securities and Exchange Commission on December 27, 2004 and is incorporated herein by reference. The foregoing description of Amendment No. 2 does not purport to be complete and is qualified in its entirety by reference to the full text of Amendment No. 2. Item 2. Exhibits. -------- 1. Amendment No. 2 to Rights Agreement, dated as of December 27, 2004, by and between the registrant and Equiserve Trust Company, N.A. (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K filed by the registrant with the Securities and Exchange Commission on December 27, 2004). SIGNATURE Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized. Date: December 27, 2004 CALGON CARBON CORPORATION By: /s/ Michael J. Mocniak ------------------------------ Michael J. Mocniak Senior Vice President, General Counsel and Secretary EXHIBIT INDEX Exhibit Description ------- ----------- 1. Amendment No. 2 to Rights Agreement, dated as of December 27, 2004, by and between the registrant and Equiserve Trust Company, N.A. (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K filed by the registrant with the Securities and Exchange Commission on December 27, 2004).