================================================================================ SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ----------------- 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 ----------------- CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND (Exact Name of Registrant as Specified in Its Charter) DELAWARE 03-0426532 (State of Incorporation (I.R.S. Employer or Organization) Identification No.) 1111 EAST WARRENVILLE ROAD NAPERVILLE, ILLINOIS 60536-1493 (Address of Principal Executive Offices) If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box. [X] If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box. [ ] Securities Act registration statement file number to which this form relates: 333-86678 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 Shares of beneficial interest New York Stock Exchange without par value Securities to be registered pursuant to Section 12(g) of the Act: NONE (Title of Class) ================================================================================ ITEM 1. DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED. The shares (the "Shares") to be registered hereunder are common shares of beneficial interest, without par value, of Calamos Convertible Opportunities and Income Fund (the "Registrant"). A description of the Shares is contained under the heading "Description of Shares" in the prospectus included in the Registrant's registration statement on Form N-2 filed under the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, on April 22, 2002 (Registration Nos. 333-86678 and 811-21080, respectively), (the "Original Registration Statement") as amended by Pre-Effective Amendment No. 1 to the Original Registration Statement, as filed with the Commission on May 24, 2002, which description is incorporated herein by reference. ITEM 2. EXHIBITS. Pursuant to the Instructions as to Exhibits, no exhibits are filed herewith or incorporated herein by reference. 2 SIGNATURES 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, thereto duly authorized. Dated: June 12, 2002 CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND By: /s/ James S. Hamman, Jr. ------------------------------------ James S. Hamman, Jr. Secretary 3