UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES INVESTMENT COMPANY ACT FILE NUMBER: 811-21080 EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER: Calamos Convertible Opportunities and Income Fund ADDRESS OF PRINCIPAL EXECUTIVE OFFICES: 1111 East Warrenville Road, Naperville, Illinois 60563 NAME AND ADDRESS OF AGENT FOR SERVICE: James S. Hamman, Jr., Secretary, Calamos Advisors, LLC 1111 East Warrenville Road Naperville, Illinois 60563-1493 REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (630) 245-7200 DATE OF FISCAL YEAR END: October 31, 2005 DATE OF REPORTING PERIOD: November 1, 2004 through April 30, 2005 ITEM 1. REPORTS TO SHAREHOLDERS [PHOTO OMITTED] CALAMOS(R) CONVERTIBLE OPPORTUNITIES AND INCOME FUND SEMIANNUAL REPORT APRIL 30, 2005 [LOGO] CALAMOS INVESTMENTS(R) Table of Contents President's Letter ........................................................ 1 Schedule of Investments ................................................... 3 Statement of Assets and Liabilities ....................................... 11 Statement of Operations ................................................... 12 Statement of Changes In Net Assets ........................................ 13 Notes to Financial Statements ............................................. 14 Financial Highlights ...................................................... 20 Report of Independent Registered Public Accounting Firm ......................................................... 21 Other Information ......................................................... 22 President's Letter [PHOTO OMITTED] Dear Shareholder, This semi-annual report covers the period of November 1, 2004, to April 30, 2005, a period where the convertible market declined and high-yield markets were generally flat. Although the CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND (NYSE: CHI) dropped slightly in price during the period, it produced a steady, significant monthly dividend for shareholders, and continues to trade at a premium to its underlying portfolio's NAV (net asset value). As a refresher to some of our shareholders, a closed-end fund is traded on an exchange, where buyers and sellers determine the price of the fund. The fund thus may trade at a premium (higher than NAV) or at a discount (lower than NAV). Designed to provide total return through a combination of capital appreciation and current income, the Fund makes use of convertible and high-yield securities in a flexible, opportunistic manner to achieve this goal. It is important to note that while convertible and high-yield bonds provide income to the portfolio, they also provide the opportunity for capital appreciation, as they are more equity sensitive than traditional fixed income bonds. By dynamically combining these securities, we aim for long term total return, combining significant current income with equity market participation. For the semi-annual period, questions over the strength of the economy dampened high yield bonds, while convertibles dropped due to declines in the volatility of equities and excessive selling by hedge funds. We think the market was driven by short-term concerns during this semi-annual period, while our portfolios remained positioned to take advantage of longer-term trends. We viewed the convertible market as substantially undervalued in the first portion of 2005, and invested in additional opportunities which we believe offered potentially significant upside yet met our investment team's risk-management criteria. A recent development worth noting is the Board of Trustees' ratification of a level-rate distribution policy for the Fund, announced in June of 2005. We recognize how important stability of income can be, particularly to closed-end fund investors, and sought to formalize the Fund's aim to providing such stability. At a monthly rate of $0.15 per share, the Fund's distribution represents an annualized rate of 12% based on the Fund's CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND The views expressed in this report reflect those of Calamos Advisors LLC through June 20, 2005. The manager's views are subject to change at any time based on market and other conditions. This report is submitted for general information for the shareholders of the fund. Convertible Opportunities and Income Fund President's Letter SEMIANNUAL REPORT 1 President's Letter initial offering price of $15.00, and equates to $1.80 per share on an annual basis. We believe that the adoption of a level rate distribution policy has the potential to serve the long-term interests of you as a CHI shareholder, as consistent, dependable distributions can be an important component of your total return goals. If any distribution exceeds the Fund's net investment company taxable income, the excess will generally be a tax-free return of capital. Together, the Fund's portfolio management team's risk-managed approach, communications efforts, and dividend policy are all designed to enhance the value of your investment. We believe that the Fund's flexible mandate and its focus on long-term total return provides the potential to create long term wealth for shareholders, while our risk management and dividend commitment provide downside protection and current, dependable income. As a portfolio manager--and shareholder--I remain committed to striving to help you meet your long-term investment goals. Thank you for your confidence in CALAMOS INVESTMENTS and CHI. Sincerely, /s/ John P. Calamos JOHN P. CALAMOS, SR. Chairman, Chief Executive Officer and Co-Chief Investment Officer Convertible Opportunities and Income Fund 2 SEMIANNUAL REPORT President's Letter Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- CORPORATE BONDS (93.0%) CONSUMER DISCRETIONARY (29.9%) $ 1,916,000 Accuride Corp.* 8.500%, 02/01/15 $ 1,810,620 6,879,000 Aztar Corp.^ 7.875%, 06/15/14 7,240,147 11,319,000 Beazer Homes USA, Inc. 8.375%, 04/15/12 12,054,735 871,000 CanWest Media, Inc.^ 7.625%, 04/15/13 916,780 4,354,000 DEX Media, Inc.^ 8.000%, 11/15/13 4,506,390 3,075,000 DIRECTV Financing Company, Inc. 8.375%, 03/15/13 3,344,062 6,940,000 GBP EMI Group, PLC 9.750%, 05/20/08 14,356,958 6,966,000 General Motors Corp.^ 8.250%, 07/15/23 5,340,456 1,741,000 Global Cash Access, Inc.^ 8.750%, 03/15/12 1,880,280 Goodyear Tire & Rubber Company 7,401,000 7.000%, 03/15/28 6,161,332 3,483,000 7.857%, 08/15/11^ 3,152,115 3,483,000 Hasbro, Inc. 6.600%, 07/15/28 3,672,688 6,944,000 Hovnanian Enterprises, Inc.^ 7.750%, 05/15/13 7,100,240 3,483,000 IMAX Corp.^ 9.625%, 12/01/10 3,700,688 2,612,000 Intrawest Corp. 7.500%, 10/15/13 2,612,000 12,190,000 Isle of Capri Casinos, Inc.^ 9.000%, 03/15/12 13,256,625 2,011,000 Jarden Corp. 9.750%, 05/01/12 2,151,770 3,722,000 Kellwood Company 7.625%, 10/15/17 3,970,090 7,923,000 La Quinta, Corp. 8.875%, 03/15/11 8,566,744 2,612,000 Landry's Restaurants, Inc.*^ 7.500%, 12/15/14 2,442,220 15,237,000 Mandalay Resort Group 10.250%, 08/01/07 16,798,793 6,792,000 NCL Holding, ASA* 10.625%, 07/15/14 6,995,760 3,918,000 Oxford Industries, Inc. 8.875%, 06/01/11 4,074,720 4,354,000 Phillips-Van Heusen Corp. 8.125%, 05/01/13 4,506,390 1,741,000 Reader's Digest Association, Inc.^ 6.500%, 03/01/11 1,736,648 2,482,000 RH Donnelley Financial Corp.* 10.875%, 12/15/12 2,848,095 3,918,000 CAD Rogers Wireless, Inc. 7.625%, 12/15/11 3,199,352 PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 3,265,000 CAD Rogers Cable, Inc. 7.250%, 12/15/11 $ 2,620,718 7,053,000 Royal Caribbean Cruises, Ltd.^ 8.750%, 02/02/11 7,934,625 13,496,000 Russell Corp. 9.250%, 05/01/10 14,069,580 8,707,000 Spanish Broadcasting Systems, Inc. 9.625%, 11/01/09 9,131,466 4,266,000 Stoneridge, Inc. 11.500%, 05/01/12 4,543,290 6,966,000 Time Warner 7.625%, 04/15/31 8,515,392 11,058,000 Vail Resorts, Inc. 6.750%, 02/15/14 10,947,420 Warner Music Group 6,095,000 7.375%, 04/15/14^ 6,125,475 871,000 GBP 8.125%, 04/15/14 1,735,923 7,401,000 WCI Communities, Inc. 7.875%, 10/01/13 7,401,000 -------------- 221,421,587 -------------- CONSUMER STAPLES (10.6%) 1,741,000 Central Garden & Pet Company^ 9.125%, 02/01/13 1,880,280 4,354,000 Chattem, Inc. 7.000%, 03/01/14 4,419,310 3,788,000 Chiquita Brands International, Inc.^ 7.500%, 11/01/14 3,484,960 5,398,000 Del Monte Foods Company 8.625%, 12/15/12 5,802,850 5,224,000 DIMON, Inc. 7.750%, 06/01/13 5,916,180 Dole Food Company, Inc. 7,836,000 7.250%, 06/15/10 7,904,565 3,483,000 8.625%, 05/01/09 3,683,273 10,448,000 Jean Coutu Group, Inc.^ 8.500%, 08/01/14 9,899,480 871,000 Pilgrim's Pride Corp. 9.250%, 11/15/13 975,520 5,224,000 Pinnacle Foods Holding^ 8.250%, 12/01/13 4,362,040 4,876,000 Playtex Products, Inc. 8.000%, 03/01/11 5,229,510 9,578,000 Rayovac Corp.^ 8.500%, 10/01/13 9,889,285 Revlon Consumer Products Corp. 2,786,000 9.500%, 04/01/11*^ 2,695,455 871,000 9.380%, 10/11/05++ 892,775 871,000 8.840%, 07/11/05++ 892,775 871,000 8.770%, 05/11/05++ 892,775 435,000 9.000%, 06/13/05++ 445,875 8,707,000 Smithfield Foods, Inc. 7.750%, 05/15/13 9,360,025 -------------- 78,626,933 -------------- Convertible Opportunities and Income Fund Schedule of Investments SEMIANNUAL REPORT 3 See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- ENERGY (12.3%) $ 7,401,000 Chesapeake Energy Corp. 6.875%, 01/15/16 $ 7,401,000 5,660,000 Comstock Resources, Inc. 6.875%, 03/01/12 5,546,800 2,612,000 Forest Oil Corp. 8.000%, 12/15/11 2,847,080 10,187,000 General Maritime Corp.^ 10.000%, 03/15/13 11,129,297 4,585,000 Giant Industries, Inc. 11.000%, 05/15/12 5,249,825 4,005,000 KCS Energy, Inc. 7.125%, 04/01/12 3,984,975 5,977,000 Overseas Shipholding Group, Inc. 7.500%, 02/15/24 5,767,805 9,839,000 Petroleo Brasileiro, SA^ 8.375%, 12/10/18 10,097,274 4,354,000 Plains All American Pipeline, L.P. 7.750%, 10/15/12 5,113,490 5,573,000 Premcor Refining Group Inc.^ 9.500%, 02/01/13 6,353,220 2,373,000 Premcor Refining Group, Inc. 7.500%, 06/15/15 2,562,840 2,612,000 Range Resources Corp. 7.375%, 07/15/13 2,703,420 6,095,000 Swift Energy Company 9.375%, 05/01/12 6,552,125 4,628,000 Tesoro Petroleum Corp.^ 9.625%, 04/01/12 5,137,080 Williams Companies, Inc.^ 8,707,000 7.750%, 06/15/31 9,229,420 1,741,000 7.500%, 01/15/31 1,806,288 -------------- 91,481,939 -------------- FINANCIALS (1.6%) 6,530,000 Leucadia National Corp. 7.000%, 08/15/13 6,562,650 1,480,000 Omega Healthcare Investors, Inc. 7.000%, 04/01/14 1,435,600 3,396,000 Senior Housing Properties Trust 7.875%, 04/15/15 3,574,290 -------------- 11,572,540 -------------- HEALTH CARE (5.6%) 1,802,000 Alpharma, Inc.*^ 8.625%, 05/01/11 1,756,950 3,570,000 Ameripath, Inc.^ 10.500%, 04/01/13 3,587,850 7,357,000 Bausch & Lomb, Inc. 7.125%, 08/01/28 7,577,710 2,612,000 Beverly Enterprises, Inc. 7.875%, 06/15/14 2,873,200 3,483,000 MedCath Corp.^ 9.875%, 07/15/12 3,813,885 PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 5,660,000 Quintiles Transnational Corp. 10.000%, 10/01/13 $ 6,141,100 7,401,000 Tenet Healthcare Corp.*^ 9.250%, 02/01/15 7,438,005 2,612,000 Valeant Pharmaceuticals International^ 7.000%, 12/15/11 2,572,820 5,660,000 Vanguard Health Systems, Inc. 9.000%, 10/01/14 5,928,850 -------------- 41,690,370 -------------- INDUSTRIALS (8.8%) 871,000 EUR AGCO Corp. 6.875%, 04/15/14 1,176,889 2,177,000 Armor Holdings, Inc.^ 8.250%, 08/15/13 2,318,505 1,862,000 Gardner Denver, Inc.* 8.000%, 05/01/13 1,871,310 2,612,000 GATX Corp. 8.875%, 06/01/09 2,974,684 5,660,000 General Cable Corp. 9.500%, 11/15/10 6,027,900 5,224,000 Hutchison Whampoa, Ltd.*^ 6.250%, 01/24/14 5,524,281 2,612,000 Jacuzzi Brands, Inc. 9.625%, 07/01/10 2,807,900 JLG Industries, Inc.^ 3,918,000 8.250%, 05/01/08 4,074,720 871,000 8.375%, 06/15/12 910,195 5,573,000 Laidlaw Global Securities, Inc. 10.750%, 06/15/11 6,381,085 10,884,000 EUR Legrand Holding, SA 11.000%, 02/15/13 16,894,836 2,960,000 Monitronics International, Inc. 11.750%, 09/01/10 3,174,600 962,000 Orbital Sciences Corp. 9.000%, 07/15/11 1,048,580 7,836,000 Terex Corp.^ 7.375%, 01/15/14 7,914,360 2,333,000 United Agri Products, Inc. 8.250%, 12/15/11 2,298,005 -------------- 65,397,850 -------------- INFORMATION TECHNOLOGY (8.5%) 5,660,000 Advanced Micro Devices, Inc.^ 7.750%, 11/01/12 5,334,550 3,483,000 Celestica, Inc.^ 7.875%, 07/01/11 3,483,000 1,306,000 Communications & Power Industries Holding Corp. 8.000%, 02/01/12 1,266,820 4,354,000 Flextronics International, Ltd.^ 6.500%, 05/15/13 4,179,840 4,354,000 Freescale Semiconductor, Inc. 7.125%, 07/15/14 4,549,930 Iron Mountain, Inc. 4,354,000 GBP 7.250%, 04/15/14* 7,598,111 1,741,000 6.625%, 01/01/16 1,558,195 Convertible Opportunities and Income Fund 4 SEMIANNUAL REPORT Schedule of Investments See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 3,831,000 Lucent Technologies, Inc. 6.500%, 01/15/28 $ 3,227,617 9,099,000 Sanmina-Sci Corp. 10.375%, 01/15/10 10,008,900 1,741,000 Stratus Technologies, Inc.^ 10.375%, 12/01/08 1,706,180 5,224,000 Telcordia Technologies* 10.000%, 03/15/13 5,067,280 Xerox Corp.^ 8,272,000 8.000%, 02/01/27 8,396,080 6,095,000 7.625%, 06/15/13 6,536,888 -------------- 62,913,391 -------------- MATERIALS (13.9%) Aleris International, Inc. 2,090,000 10.375%, 10/15/10 2,283,325 995,000 9.000%, 11/15/14*^ 1,019,875 5,224,000 Arch Western Finance, LLC^ 6.750%, 07/01/13 5,263,180 7,836,000 Buckeye Technologies, Inc. 8.500%, 10/01/13 8,188,620 4,354,000 Equistar Chemicals, LP 10.625%, 05/01/11 4,876,480 7,462,000 Freeport-McMoRan Copper & Gold, Inc. 10.125%, 02/01/10 8,208,200 14,802,000 Georgia-Pacific Corp.^ 8.125%, 05/15/11 16,263,697 4,316,000 Graham Packaging Holdings Company*^ 9.875%, 10/15/14 4,143,360 6,491,000 IPSCO, Inc.^ 8.750%, 06/01/13 7,237,465 3,483,000 Neenah Paper, Inc.*^ 7.375%, 11/15/14 3,326,265 2,394,000 Novelis, Inc.* 7.250%, 02/15/15 2,328,165 7,836,000 Polyone Corp.^ 10.625%, 05/15/10 8,678,370 3,918,000 Pope & Talbot, Inc. 8.375%, 06/01/13 4,094,310 6,966,000 Sealed Air Corp.* 6.875%, 07/15/33 7,743,218 4,353,000 Steel Dynamics, Inc. 9.500%, 03/15/09^ 4,679,475 7,357,000 Texas Industries, Inc. 10.250%, 06/15/11 8,295,017 Union Carbide Corp. 3,483,000 7.500%, 06/01/25 3,737,621 2,699,000 7.875%, 04/01/23^ 2,960,215 -------------- 103,326,858 -------------- TELECOMMUNICATION SERVICES (1.5%) 1,741,000 IPCS Escrow Company 11.500%, 05/01/12 1,932,510 PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 8,707,000 Nextel Communications, Inc. 7.375%, 08/01/15 $ 9,316,490 -------------- 11,249,000 -------------- UTILITIES (0.3%) 2,044,000 NRG Energy, Inc.*^ 8.000%, 12/15/13 2,074,660 -------------- TOTAL CORPORATE BONDS (Cost $662,298,184) 689,755,128 ============== CONVERTIBLE BONDS (6.1%) CONSUMER DISCRETIONARY (1.6%) 5,625,000 General Motors Corp.+ 5.250%, 03/06/32 3,728,250 7,500,000 Walt Disney Company^ 2.125%, 04/15/23 7,912,500 -------------- 11,640,750 -------------- INDUSTRIALS (1.2%) 6,000,000 GATX Corp. 7.500%, 02/01/07 6,967,500 1,852,000 Quanta Services Inc. 4.500%, 10/01/23 1,856,630 450,000 Titan International, Inc. 5.250%, 07/26/09 549,000 -------------- 9,373,130 -------------- INFORMATION TECHNOLOGY (3.3%) 5,500,000 Advanced Micro Devices, Inc.^++ 4.750%, 02/01/22 5,163,125 6,500,000 ASML Holding, NV 5.750%, 10/15/06 6,948,299 12,000,000 Corning, Inc.^ 4.875%, 03/01/08 12,105,000 -------------- 24,216,424 -------------- TOTAL CONVERTIBLE BONDS (Cost $45,033,502) 45,230,304 ============== SYNTHETIC CONVERTIBLE SECURITIES (16.3%) CORPORATE BONDS (13.8%) CONSUMER DISCRETIONARY (4.4%) 284,000 Accuride Corp.* 8.500%, 02/01/15 268,380 1,021,000 Aztar Corp.^ 7.875%, 06/15/14 1,074,602 1,681,000 Beazer Homes USA, Inc. 8.375%, 04/15/12 1,790,265 129,000 CanWest Media, Inc.^ 7.625%, 04/15/13 135,780 646,000 DEX Media, Inc.^ 8.000%, 11/15/13 668,610 457,000 DIRECTV Financing Company, Inc. 8.375%, 03/15/13 496,987 1,030,000 GBP EMI Group, PLC 9.750%, 05/20/08 2,130,788 Convertible Opportunities and Income Fund Schedule of Investments SEMIANNUAL REPORT 5 See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 1,034,000 General Motors Corp.^ 8.250%, 07/15/23 $ 792,712 259,000 Global Cash Access, Inc.^ 8.750%, 03/15/12 279,720 Goodyear Tire & Rubber Company 1,099,000 7.000%, 03/15/28 914,918 517,000 7.857%, 08/15/11^ 467,885 517,000 Hasbro, Inc. 6.600%, 07/15/28 545,156 1,031,000 Hovnanian Enterprises, Inc.^ 7.750%, 05/15/13 1,054,198 517,000 IMAX Corp.^ 9.625%, 12/01/10 549,313 388,000 Intrawest Corp. 7.500%, 10/15/13 388,000 1,810,000 Isle of Capri Casinos, Inc.^ 9.000%, 03/15/12 1,968,375 299,000 Jarden Corp. 9.750%, 05/01/12 319,930 553,000 Kellwood Company 7.625%, 10/15/17 589,860 1,177,000 La Quinta, Corp. 8.875%, 03/15/11 1,272,631 388,000 Landry's Restaurants, Inc.*^ 7.500%, 12/15/14 362,780 2,263,000 Mandalay Resort Group 10.250%, 08/01/07 2,494,958 1,008,000 NCL Holding, ASA* 10.625%, 07/15/14 1,038,240 582,000 Oxford Industries, Inc. 8.875%, 06/01/11 605,280 646,000 Phillips-Van Heusen Corp. 8.125%, 05/01/13 668,610 259,000 Reader's Digest Association, Inc.^ 6.500%, 03/01/11 258,353 368,000 RH Donnelley Financial Corp.* 10.875%, 12/15/12 422,280 582,000 CAD Rogers Wireless, Inc. 7.625%, 12/15/11 475,248 485,000 CAD Rogers Cable, Inc. 7.250%, 12/15/11 389,295 1,047,000 Royal Caribbean Cruises, Ltd.^ 8.750%, 02/02/11 1,177,875 2,004,000 Russell Corp. 9.250%, 05/01/10 2,089,170 1,293,000 Spanish Broadcasting Systems, Inc. 9.625%, 11/01/09 1,356,034 634,000 Stoneridge, Inc. 11.500%, 05/01/12 675,210 1,034,000 Time Warner 7.625%, 04/15/31 1,263,984 1,642,000 Vail Resorts, Inc. 6.750%, 02/15/14 1,625,580 Warner Music Group 905,000 7.375%, 04/15/14^ 909,525 PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 129,000 GBP 8.125%, 04/15/14 $ 257,100 1,099,000 WCI Communities, Inc. 7.875%, 10/01/13 1,099,000 -------------- 32,876,632 -------------- CONSUMER STAPLES (1.6%) 259,000 Central Garden & Pet Company^ 9.125%, 02/01/13 279,720 646,000 Chattem, Inc. 7.000%, 03/01/14 655,690 562,000 Chiquita Brands International, Inc.^ 7.500%, 11/01/14 517,040 802,000 Del Monte Foods Company 8.625%, 12/15/12 862,150 776,000 DIMON, Inc. 7.750%, 06/01/13 878,820 Dole Food Company, Inc. 1,164,000 7.250%, 06/15/10 1,174,185 517,000 8.625%, 05/01/09 546,727 1,552,000 Jean Coutu Group, Inc.^ 8.500%, 08/01/14 1,470,520 129,000 Pilgrim's Pride Corp. 9.250%, 11/15/13 144,480 776,000 Pinnacle Foods Holding^ 8.250%, 12/01/13 647,960 724,000 Playtex Products, Inc. 8.000%, 03/01/11 776,490 1,422,000 Rayovac Corp.^ 8.500%, 10/01/13 1,468,215 Revlon Consumer Products Corp. 414,000 9.500%, 04/01/11*^ 400,545 129,000 9.380%, 10/11/05++ 132,225 129,000 8.840%, 07/11/05++ 132,225 129,000 8.770%, 05/11/05++ 132,225 65,000 9.000%, 06/13/05++ 66,625 1,293,000 Smithfield Foods, Inc. 7.750%, 05/15/13 1,389,975 -------------- 11,675,817 -------------- ENERGY (1.8%) 1,099,000 Chesapeake Energy Corp. 6.875%, 01/15/16 1,099,000 840,000 Comstock Resources, Inc. 6.875%, 03/01/12 823,200 388,000 Forest Oil Corp. 8.000%, 12/15/11 422,920 1,513,000 General Maritime Corp.^ 10.000%, 03/15/13 1,652,952 681,000 Giant Industries, Inc. 11.000%, 05/15/12 779,745 595,000 KCS Energy, Inc. 7.125%, 04/01/12 592,025 888,000 Overseas Shipholding Group, Inc. 7.500%, 02/15/24 856,920 1,461,000 Petroleo Brasileiro, SA^ 8.375%, 12/10/18 1,499,351 Convertible Opportunities and Income Fund 6 SEMIANNUAL REPORT Schedule of Investments See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 646,000 Plains All American Pipeline, L.P. 7.750%, 10/15/12 $ 758,685 827,000 Premcor Refining Group Inc.^ 9.500%, 02/01/13 942,780 352,000 Premcor Refining Group, Inc. 7.500%, 06/15/15 380,160 388,000 Range Resources Corp. 7.375%, 07/15/13 401,580 905,000 Swift Energy Company 9.375%, 05/01/12 972,875 687,000 Tesoro Petroleum Corp.^ 9.625%, 04/01/12 762,570 Williams Companies, Inc.^ 1,293,000 7.750%, 06/15/31 1,370,580 259,000 7.500%, 01/15/31 268,713 -------------- 13,584,056 -------------- FINANCIALS (0.2%) 970,000 Leucadia National Corp. 7.000%, 08/15/13 974,850 220,000 Omega Healthcare Investors, Inc. 7.000%, 04/01/14 213,400 504,000 Senior Housing Properties Trust 7.875%, 04/15/15 530,460 -------------- 1,718,710 -------------- HEALTH CARE (0.8%) 268,000 Alpharma, Inc.*^ 8.625%, 05/01/11 261,300 530,000 Ameripath, Inc.^ 10.500%, 04/01/13 532,650 1,093,000 Bausch & Lomb, Inc. 7.125%, 08/01/28 1,125,790 388,000 Beverly Enterprises, Inc. 7.875%, 06/15/14 426,800 517,000 MedCath Corp.^ 9.875%, 07/15/12 566,115 840,000 Quintiles Transnational Corp. 10.000%, 10/01/13 911,400 1,099,000 Tenet Healthcare Corp.*^ 9.250%, 02/01/15 1,104,495 388,000 Valeant Pharmaceuticals International^ 7.000%, 12/15/11 382,180 840,000 Vanguard Health Systems, Inc. 9.000%, 10/01/14 879,900 -------------- 6,190,630 -------------- INDUSTRIALS (1.3%) 129,000 EUR AGCO Corp. 6.875%, 04/15/14 174,304 323,000 Armor Holdings, Inc.^ 8.250%, 08/15/13 343,995 277,000 Gardner Denver, Inc.* 8.000%, 05/01/13 278,385 388,000 GATX Corp. 8.875%, 06/01/09 441,875 PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 840,000 General Cable Corp. 9.500%, 11/15/10 $ 894,600 776,000 Hutchison Whampoa, Ltd.*^ 6.250%, 01/24/14 820,605 388,000 Jacuzzi Brands, Inc. 9.625%, 07/01/10 417,100 JLG Industries, Inc.^ 582,000 8.250%, 05/01/08 605,280 129,000 8.375%, 06/15/12 134,805 827,000 Laidlaw Global Securities, Inc. 10.750%, 06/15/11 946,915 1,616,000 EUR Legrand Holding, SA 11.000%, 02/15/13 2,508,458 440,000 Monitronics International, Inc. 11.750%, 09/01/10 471,900 143,000 Orbital Sciences Corp. 9.000%, 07/15/11 155,870 1,164,000 Terex Corp.^ 7.375%, 01/15/14 1,175,640 347,000 United Agri Products, Inc. 8.250%, 12/15/11 341,795 -------------- 9,711,527 -------------- INFORMATION TECHNOLOGY (1.3%) 840,000 Advanced Micro Devices, Inc.^ 7.750%, 11/01/12 791,700 517,000 Celestica, Inc.^ 7.875%, 07/01/11 517,000 194,000 Communications & Power Industries Holding Corp. 8.000%, 02/01/12 188,180 646,000 Flextronics International, Ltd.^ 6.500%, 05/15/13 620,160 646,000 Freescale Semiconductor, Inc. 7.125%, 07/15/14 675,070 Iron Mountain, Inc. 646,000 GBP 7.250%, 04/15/14* 1,127,327 259,000 6.625%, 01/01/16 231,805 569,000 Lucent Technologies, Inc. 6.500%, 01/15/28 479,382 1,351,000 Sanmina-Sci Corp. 10.375%, 01/15/10 1,486,100 259,000 Stratus Technologies, Inc.^ 10.375%, 12/01/08 253,820 776,000 Telcordia Technologies* 10.000%, 03/15/13 752,720 Xerox Corp.^ 1,228,000 8.000%, 02/01/27 1,246,420 905,000 7.625%, 06/15/13 970,613 -------------- 9,340,297 -------------- MATERIALS (2.1%) Aleris International, Inc. 310,000 10.375%, 10/15/10 338,675 148,000 9.000%, 11/15/14*^ 151,700 776,000 Arch Western Finance, LLC^ 6.750%, 07/01/13 781,820 Convertible Opportunities and Income Fund Schedule of Investments SEMIANNUAL REPORT 7 See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- $ 1,164,000 Buckeye Technologies, Inc. 8.500%, 10/01/13 $ 1,216,380 646,000 Equistar Chemicals, LP 10.625%, 05/01/11 723,520 1,108,000 Freeport-McMoRan Copper & Gold, Inc. 10.125%, 02/01/10 1,218,800 2,198,000 Georgia-Pacific Corp.^ 8.125%, 05/15/11 2,415,052 641,000 Graham Packaging Holdings Company*^ 9.875%, 10/15/14 615,360 964,000 IPSCO, Inc.^ 8.750%, 06/01/13 1,074,860 517,000 Neenah Paper, Inc.*^ 7.375%, 11/15/14 493,735 356,000 Novelis, Inc.* 7.250%, 02/15/15 346,210 1,164,000 Polyone Corp.^ 10.625%, 05/15/10 1,289,130 582,000 Pope & Talbot, Inc. 8.375%, 06/01/13 608,190 1,034,000 Sealed Air Corp.* 6.875%, 07/15/33 1,149,366 647,000 Steel Dynamics, Inc. 9.500%, 03/15/09^ 695,525 1,093,000 Texas Industries, Inc. 10.250%, 06/15/11 1,232,358 Union Carbide Corp. 517,000 7.500%, 06/01/25 554,795 401,000 7.875%, 04/01/23^ 439,810 -------------- 15,345,286 -------------- TELECOMMUNICATION SERVICES (0.2%) 259,000 IPCS Escrow Company 11.500%, 05/01/12 287,490 1,293,000 Nextel Communications, Inc. 7.375%, 08/01/15 1,383,510 -------------- 1,671,000 -------------- UTILITIES (0.1%) 304,000 NRG Energy, Inc.*^ 8.000%, 12/15/13 308,560 -------------- TOTAL CORPORATE BONDS 102,422,515 ============== NUMBER OF CONTRACTS VALUE -------------------------------------------------------------------------------- OPTIONS (2.5%) CONSUMER DISCRETIONARY (0.5%) 1,400 eBay, Inc.# Call, 01/20/07, Strike 42.50 $ 476,000 2,650 Home Depot, Inc.# Call, 01/20/07, Strike 40.00 874,500 1,000 Nordstrom, Inc.# Call, 01/20/07, Strike 50.00 850,000 2,500 YUM! Brands, Inc.# Call, 01/20/07, Strike 50.00 1,200,000 -------------- 3,400,500 -------------- CONSUMER STAPLES (0.3%) 1,400 Avon Products, Inc.# Call, 01/20/07, Strike 45.00 581,000 1,300 Constellation Brands, Inc.# Call, 01/20/07, Strike 55.00 1,066,000 1,800 Sara Lee Corp.# Call, 01/20/07, Strike 22.50 274,500 -------------- 1,921,500 -------------- ENERGY (0.4%) 1,500 Apache Corp.# Call, 01/20/07, Strike 60.00 1,290,000 1,000 Patterson-UTI Energy, Inc.# Call, 01/20/07, Strike 25.00 535,000 1,600 Transocean, Inc.# Call, 01/20/07, Strike 55.00 1,128,000 -------------- 2,953,000 -------------- HEALTH CARE (0.5%) 1,500 Guidant Corp.# Call, 01/21/06, Strike 70.00 1,005,000 750 Triad Hospitals, Inc.# Call, 01/20/07, Strike 50.00 708,750 800 UnitedHealth Group, Inc.# Call, 01/20/07, Strike 85.00 1,760,000 -------------- 3,473,750 -------------- INDUSTRIALS (0.2%) 2,800 American Power Conversion Corp.# Call, 01/20/07, Strike 25.00 896,000 1,700 American Standard Companies, Inc.# Call, 01/20/07, Strike 50.00 765,000 -------------- 1,661,000 -------------- Convertible Opportunities and Income Fund 8 SEMIANNUAL REPORT Schedule of Investments See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- NUMBER OF CONTRACTS VALUE -------------------------------------------------------------------------------- INFORMATION TECHNOLOGY (0.6%) 1,800 Apple Computer, Inc.# Call, 01/20/07, Strike 37.50 $ 1,458,000 600 Electronic Arts, Inc.# Call, 01/20/07, Strike 70.00 264,000 3,000 Emulex Corp.# Call, 01/20/07, Strike 17.50 885,000 4,400 Nokia Corp.# Call, 01/20/07, Strike 15.00 1,320,000 1,800 Sandisk Corp.# Call, 01/20/07, Strike 30.00 738,000 -------------- 4,665,000 -------------- TOTAL OPTIONS 18,074,750 ============== TOTAL SYNTHETIC CONVERTIBLE SECURITIES (Cost $121,124,037) 120,497,265 ============== NUMBER OF SHARES VALUE -------------------------------------------------------------------------------- CONVERTIBLE PREFERRED STOCKS (31.4%) CONSUMER DISCRETIONARY (4.5%) 856,000 Ford Motor Company Capital Trust II 6.500% 33,341,200 -------------- CONSUMER STAPLES (3.2%) 1,115,500 Albertson's, Inc. 7.250% 23,938,630 -------------- ENERGY (1.5%) 135,000 Amerada Hess Corp. 7.000% 10,979,550 -------------- FINANCIALS (12.4%) 11,700,000 Assurant, Inc.* 7.750% 11,928,150 400,000 Chubb Corp. 7.000% 11,936,000 250,000 Hartford Financial Services Group, Inc. 7.000% 16,500,000 465,000 Lehman Brothers Holdings, Inc. 6.250% 12,308,550 190,000 Merrill Lynch & Company, Inc.^ 6.750% 6,565,070 650,000 National Australia Bank, Ltd. 7.875% 24,635,000 150,000 Washington Mutual, Inc. 5.375% 7,702,500 -------------- 91,575,270 -------------- NUMBER OF SHARES VALUE -------------------------------------------------------------------------------- HEALTH CARE (1.9%) 245,000 Baxter International, Inc.^ 7.000% $ 13,646,500 -------------- INDUSTRIALS (0.9%) 2,500,000 GBP BAE Systems, PLC 7.750% 6,525,593 -------------- INFORMATION TECHNOLOGY (1.5%) 235,000 Pioneer-Standard Financial Trust 6.750% 11,338,750 -------------- UTILITIES (5.5%) 410,000 AES Corp. Trust III 6.750% 17,978,500 350,000 CenterPoint Energy, Inc.++ 2.000% 11,785,900 26,900 Southern Union Company 5.000% 1,349,035 140,000 TXU Corp. 8.125% 9,938,600 -------------- 41,052,035 -------------- TOTAL CONVERTIBLE PREFERRED STOCKS (Cost $221,228,936) 232,397,528 ============== PRINCIPAL AMOUNT VALUE -------------------------------------------------------------------------------- SHORT-TERM INVESTMENT (1.9%) $ 13,938,000 Exxon Mobil Corporation 2.600%, 05/02/05 (Cost $13,936,993) 13,936,993 ============== NUMBER OF SHARES VALUE -------------------------------------------------------------------------------- INVESTMENT OF CASH COLLATERAL FOR SECURITIES ON LOAN (20.5%) 152,104,340 Bank of New York Institutional Cash Reserve Fund current rate 3.010% (Cost $152,104,340) 152,104,340 ============== TOTAL INVESTMENTS (169.2%) (Cost $1,215,725,992) 1,253,921,558 ============== PAYABLE UPON RETURN OF SECURITIES ON LOAN (-20.5%) (152,104,340) -------------- OTHER ASSETS, LESS LIABILITIES (3.2%) 23,813,406 -------------- PREFERRED SHARES AT REDEMPTION VALUE INCLUDING DIVIDENDS PAYABLE (-51.9%) (384,324,540) -------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS (100.0%) $ 741,306,084 ============== Convertible Opportunities and Income Fund Schedule of Investments SEMIANNUAL REPORT 9 See accompanying Notes to Schedule of Investments. Schedule of Investments APRIL 30, 2005 (UNAUDITED) -------------------------------------------------------------------------------- NOTES TO SCHEDULE OF INVESTMENTS NOTE: VALUES FOR SECURITIES DENOMINATED IN FOREIGN CURRENCIES ARE SHOWN IN U.S. DOLLARS. * 144A securities are those that are exempt from registration under Rule 144A of the Securities Act of 1933, as amended. These securities are generally issued to qualified institutional buyers ("QIBs"), such as the Fund. Any resale of these securities must generally be effected through a sale that is exempt from registration (e.g. a sale to another QIB), or the security must be registered for public sale. At April 30, 2005, the market value of 144A securities that could not be exchanged to the registered form was $85,243,393 or 11.5% of net assets applicable to common shareholders of the Fund. ^ Security, or portion of security, is on loan. # Non-Income producing security. + Security was purchased at a price that takes into account the value, if any, of accrued but unpaid interest. ++ Variable rate security. The interest rate shown is the rate in effect at April 30, 2005. FOREIGN CURRENCY ABBREVIATIONS CAD Canadian Dollar EUR European Monetary Unit GBP British Pound Sterling [THE FOLLOWING TABLE WAS REPRESENTED AS A BAR CHART IN THE PRINTED MATERIAL.] FUND SECTOR ALLOCATION CONSUMER DISCRETIONARY 27.8% ENERGY 10.9% MATERIALS 10.9% CONSUMER STAPLES 10.7% INFORMATION TECHNOLOGY 10.3% FINANCIALS 9.7% INDUSTRIALS 8.5% HEALTH CARE 6.0% UTILITIES 4.0% TELECOMMUNICATION SERVICES 1.2% Convertible Opportunities and Income Fund 10 SEMIANNUAL REPORT Schedule of Investments See accompanying Notes to Schedule of Investments. Statement of Assets and Liabilities APRIL 30, 2005 (UNAUDITED) --------------------------------------------------------------------------------------------- ASSETS Investments, at value* (cost $1,215,725,992) $1,253,921,558 Cash with custodian (interest bearing) 2,649 Receivable for investments sold 2,865,669 Accrued interest and dividends receivables 20,751,579 Unrealized appreciation on interest rate swaps 9,808,992 Prepaid expenses 37,877 Other assets 32,361 --------------------------------------------------------------------------------------------- Total assets 1,287,420,685 --------------------------------------------------------------------------------------------- LIABILITIES Payable for investments purchased 9,014,212 Payable to investment advisor 516,377 Payable to financial accountant 10,818 Payable for deferred compensation to Trustees 32,361 Other accounts payable and accrued liabilities 111,953 Payable upon return of securities loaned 152,104,340 --------------------------------------------------------------------------------------------- Total liabilities 161,790,061 --------------------------------------------------------------------------------------------- PREFERRED SHARES $25,000 liquidation value per share applicable to 15,360 shares, including dividends payable 384,324,540 --------------------------------------------------------------------------------------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS 741,306,084 --------------------------------------------------------------------------------------------- COMPOSITION OF NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS Common stock, no par value, unlimited shares authorized 45,687,414 shares issued and outstanding $ 659,222,410 Undistributed net investment income (loss) (405,727) Accumulated net realized gain (loss) on investments, written options, foreign currency transactions and interest rate swaps 34,476,390 Net unrealized appreciation (depreciation) on investments, written options, foreign currency translations and interest rate swaps 48,013,011 --------------------------------------------------------------------------------------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS $ 741,306,084 --------------------------------------------------------------------------------------------- Net asset value per common share based on 45,687,414 shares issued and outstanding $ 16.23 --------------------------------------------------------------------------------------------- * Includes $146,344,981 of securities loaned. Convertible Opportunities and Income Fund Statement of Assets and Liabilities SEMIANNUAL REPORT 11 See accompanying Notes to Financial Statements. Statement of Operations SIX MONTHS ENDED APRIL 30, 2005 (UNAUDITED) ---------------------------------------------------------------------------------------- INVESTMENT INCOME Interest $ 36,278,481 Dividends 6,167,571 Securities lending income 286,884 ---------------------------------------------------------------------------------------- Total investment income 42,732,936 ---------------------------------------------------------------------------------------- EXPENSES Investment advisory fees 4,686,099 Financial accounting fees 66,853 Auction agent and rating agency fees 527,235 Printing and mailing fees 101,177 Accounting fees 84,528 Audit and legal fees 53,139 Custodian fees 44,852 Registration fees 21,300 Transfer agent fees 18,506 Trustees' fees 13,549 Other 28,758 ---------------------------------------------------------------------------------------- Total expenses 5,645,996 ---------------------------------------------------------------------------------------- Less expense waived (1,464,406) ---------------------------------------------------------------------------------------- Net expenses 4,181,590 ======================================================================================== NET INVESTMENT INCOME (LOSS) 38,551,346 ======================================================================================== REALIZED AND UNREALIZED GAIN (LOSS) FROM INVESTMENTS, WRITTEN OPTIONS, FOREIGN CURRENCY AND INTEREST RATE SWAPS NET REALIZED GAIN (LOSS) FROM: Investments 35,150,508 Foreign currency transactions (139,735) Interest rate swaps (720,761) CHANGE IN NET UNREALIZED APPRECIATION/DEPRECIATION ON: Investments (69,419,195) Foreign currency translations 54,632 Interest rate swaps 6,566,276 ---------------------------------------------------------------------------------------- NET REALIZED AND UNREALIZED GAIN (LOSS) FROM INVESTMENTS, WRITTEN OPTIONS, FOREIGN CURRENCY AND INTEREST RATE SWAPS (28,508,275) ======================================================================================== NET INCREASE (DECREASE) IN NET ASSETS RESULTING FROM OPERATIONS 10,043,071 ======================================================================================== DIVIDENDS TO PREFERRED SHAREHOLDERS FROM Net investment income (2,387,277) Capital gains (2,644,295) ---------------------------------------------------------------------------------------- NET INCREASE (DECREASE) IN NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS RESULTING FROM OPERATIONS $ 5,011,499 ======================================================================================== Convertible Opportunities and Income Fund 12 SEMIANNUAL REPORT Statement of Operations See accompanying Notes to Financial Statements. Statement of Changes in Net Assets For the Six Months Ended For the Year April 30, 2005 Ended (unaudited) October 31, 2004 --------------------------------------------------------------------------------------------------------------- OPERATIONS Net investment income (loss) $ 38,551,346 $ 83,577,716 Net realized gain (loss) from investments, written options, foreign currency transactions and interest rate swaps 34,290,012 48,505,589 Change in net unrealized appreciation/depreciation on investments, written options, foreign currency translations and interest rate swaps (62,798,287) (25,142,077) Dividends to preferred shareholders from Net investment income (2,387,277) (4,964,502) Capital gains (2,644,295) (162,833) -------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets applicable to common shareholders resulting from operations 5,011,499 101,813,893 -------------------------------------------------------------------------------------------------------------- DIVIDENDS TO COMMON SHAREHOLDERS FROM Net investment income (41,820,927) (79,941,663) Capital gains (46,563,355) (19,991,745) Net decrease in net assets from dividends to common shareholders (88,384,282) (99,933,408) CAPITAL STOCK TRANSACTIONS Offering costs on preferred shares -- (2,000,548) Reinvestment of dividends resulting in the issuance of common stock 16,400,381 17,635,038 Net increase (decrease) in net assets from capital stock transactions 16,400,381 15,634,490 -------------------------------------------------------------------------------------------------------------- TOTAL INCREASE (DECREASE) IN NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS (66,972,402) 17,514,975 -------------------------------------------------------------------------------------------------------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS Beginning of period 808,278,486 790,763,511 -------------------------------------------------------------------------------------------------------------- End of period $ 741,306,084 $ 808,278,486 ============================================================================================================== Undistributed net investment income (loss) $ (405,727) $ 5,251,131 Convertible Opportunities and Income Fund Statement of Changes in Net Assets SEMIANNUAL REPORT 13 See accompanying Notes to Financial Statements. Notes to Financial Statements (unaudited) NOTE 1 - ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES ORGANIZATION. CALAMOS Convertible Opportunities and Income Fund (the "Fund") was organized as a Delaware statutory trust on April 17, 2002 and is registered under the Investment Company Act of 1940 as a diversified, closed-end management investment company. The Fund commenced operations on June 28, 2002. The Fund's investment objective is to provide total return, through a combination of capital appreciation and current income. Under normal circumstances the Fund will invest at least 80% of its managed assets in a diversified portfolio of convertible and non-convertible income securities. "Managed Assets" means the total assets of the Fund (including any assets attributable to any leverage that may be outstanding) minus total liabilities (other than debt representing financial leverage). PORTFOLIO VALUATION. In computing the net asset value of the Fund, portfolio securities, except exchange traded option securities, that are traded on a securities exchange in the United States are valued at the last reported sale price as of the time of valuation, or lacking any current reported sale at the time of valuation, at the mean between the most recent bid and asked quotations. Each security traded in the over-the-counter market and quoted on the NASDAQ National Market System, is valued at the Nasdaq Official Closing Price ("NOCP"), as determined by Nasdaq, or lacking an NOCP, the last current reported sale price as of the time of valuation by Nasdaq, or lacking any current reported sale on Nasdaq at the time of valuation, at the mean between the most recent bid and asked quotations. Each option security traded on a securities exchange in the United States is valued at the last current reported sale price as of the time of valuation if the last current reported sale price falls within the consolidated bid/ask quote for the option security. If the last current reported sale price as of the time of valuation does not fall within the consolidated bid/ask quote for such option security, such security is valued at the mid-point of the consolidated bid/ask quote for the option security. Each over-the-counter option that is not traded through the Options Clearing Corporation is valued by the counterparty, or if the counterparty's price is not readily available then by using the Black-Scholes method. Each other security traded over-the-counter is valued at the mean between the most recent bid and asked quotations. Short-term securities with maturities of 60 days or less are valued at amortized cost, which approximates market value. When market quotations are not readily available or when the valuation methods mentioned above are not reflective of the fair value of the security, the security is priced at a fair value following procedures and/or guidelines approved by the Board of Trustees, which may include utilizing a systematic fair valuation model provided by an independent pricing system. The Fund may also use fair value pricing, if the value of a security it holds is, pursuant to Board of Trustees' guidelines, materially affected by events occurring before the Fund's pricing time but after the close of the primary market or exchange on which the security is traded. These procedures may utilize valuations furnished by pricing services approved by the Board of Trustees, which may be based on market transactions for comparable securities and various relationships between securities that are generally recognized by institutional traders, a computerized matrix system, or appraisals derived from information concerning the securities or similar securities received from recognized dealers in those securities. When fair value pricing is employed, the value of the portfolio security used to calculate the Fund's net asset value may differ from quoted or official closing prices. Securities that are principally traded in a foreign market are valued at the last current sale price at the time of valuation or lacking any current or reported sale at the time of valuation, at the mean between the most recent bid and asked quotations as of the close of the appropriate exchange or other designated time. Trading in securities on European and Far Eastern securities exchanges and over-the-counter markets is normally completed at various times before the close of business on each day on which the New York Stock Exchange ("NYSE") is open. Trading of these securities may not take place on every NYSE business day. In addition, trading may take place in various foreign markets on Saturdays or on other days when the NYSE is not open and on which the Fund's net asset value is not calculated. As stated above, if the market prices are not readily available or are not reflective of the fair value of the security, the security will be priced at a fair value following procedures approved by the Board of Trustees. In light of the judgment involved in fair value decisions, there can be no assurance that a fair value assigned to a particular security is accurate. Convertible Opportunities and Income Fund 14 SEMIANNUAL REPORT Notes to Financial Statements Notes to Financial Statements (unaudited) INVESTMENT TRANSACTIONS AND INVESTMENT INCOME. Short-term investment transactions are recorded on a trade date basis. Long-term investment transactions are recorded on a trade date plus one basis, except for fiscal quarter ends, which are recorded on trade date. Net realized gains and losses from investment transactions are reported on an identified cost basis. Interest income is recognized using the accrual method and includes accretion of original issue and market discount and amortization of premium. Dividend income is recognized on the ex-dividend date, except that certain dividends from foreign securities are recorded as soon as the information becomes available. FOREIGN CURRENCY TRANSLATION. Except for securities of foreign issuers valued by a pricing service, values of investments and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars using a rate selected by the advisor from rates quoted by any major bank or dealer in the particular currency market, as reported by a recognized quotation dissemination service. The Fund does not isolate that portion of the results of operations resulting from changes in foreign exchange rates on investments from the fluctuations arising from changes in market prices of securities held. Such fluctuations are included with the net realized and unrealized gain or loss from investments. Reported net realized foreign currency gains or losses arise from disposition of foreign currency, foreign currency gains or losses realized between the trade and settlement dates on securities transactions, and the difference between the amounts of dividends, interest and foreign withholding taxes recorded on the Fund's books on the transaction date and the U.S. dollar equivalent of the amounts actually received or paid. Net unrealized foreign exchange gains and losses arise from changes (due to the changes in the exchange rate) in the value of foreign currency and other assets and liabilities denominated in foreign currencies held at period end. OPTION TRANSACTIONS. For hedging and investment purposes, the Fund may purchase or write (sell) put and call options. One of the risks associated with purchasing an option among others, is that the Fund pays a premium whether or not the option is exercised. Additionally, the Fund bears the risk of loss of premium and change in market value should the counterparty not perform under the contract. Put and call options purchased are accounted for in the same manner as portfolio securities. The cost of securities acquired through the exercise of call options is increased by premiums paid. The proceeds from securities sold through the exercise of put options are decreased by the premiums paid. When the Fund writes an option, an amount equal to the premium received by the Fund is recorded as a liability and is subsequently adjusted to the current value of the option written. Premiums received from writing options that expire unexercised are treated by the Fund on the expiration date as realized gains from investments. The difference between the premium and the amount paid on effecting a closing purchase transaction, including brokerage commissions, is also treated as a realized gain, or, if the premium is less than the amount paid for the closing purchase transaction, as a realized loss. If a written call option is exercised, the premium is added to the proceeds from the sale of the underlying security or currency in determining whether the Fund has realized a gain or loss. If a written put option is exercised, the premium reduces the cost basis of the securities purchased by the Fund. The Fund as writer of an option bears the market risk of an unfavorable change in the price of the security underlying the written option. USE OF ESTIMATES. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results may differ from those estimates. INCOME TAXES. No provision has been made for income taxes because the Fund's policy is to qualify as a regulated investment company under Subchapter M of the Internal Revenue Code and distribute to shareholders substantially all of its taxable income and gains. Dividends and distributions paid to shareholders are recorded on the ex-dividend date. The amount of dividends and distributions from net investment income and net realized capital gains is determined in accordance with Federal income tax regulations, which Convertible Opportunities and Income Fund Notes to Financial Statements SEMIANNUAL REPORT 15 Notes to Financial Statements (unaudited) may differ from U.S. generally accepted accounting principles. To the extent these "book/tax" differences are permanent in nature such amounts are reclassified within the capital accounts based on their Federal tax-basis treatment. These differences are primarily due to differing treatments for foreign currency transactions, contingent payment debt instruments and methods of amortizing and accreting on fixed income securities. Financial records are not adjusted for temporary differences. NOTE 2 - INVESTMENT ADVISOR AND TRANSACTIONS WITH AFFILIATES OR CERTAIN OTHER PARTIES Pursuant to an investment advisory agreement with Calamos Advisors LLC ("Calamos Advisors"), the Fund pays an annual fee, payable monthly, equal to 0.80% based on the average weekly managed assets. Calamos Advisors has contractually agreed to waive a portion of its management fee at the annual rate of 0.25% of the average weekly managed assets of the Fund for the first five full years of the Fund's operation (through June 30, 2007) and to waive a declining amount for an additional three years (0.18% of the average weekly managed assets in 2008, 0.11% in 2009, and 0.04% in 2010). Effective November 1, 2004 Calamos Advisors receives a fee payable monthly at the annual rate of 0.0175% on the first $1 billion of combined assets; 0.0150% on the next $1 billion of combined assets; and 0.0110% on combined assets above $2 billion for financial accounting services (for purposes of this calculation combined assets means the net assets of Calamos Investment Trust and Calamos Advisors Trust, and the managed assets of Calamos Convertible and High Income Fund, Calamos Convertible Opportunities and Income Fund and Calamos Strategic Total Return Fund). Financial accounting services include, but are not limited to, the following: managing expenses and expense payment processing; monitoring the calculation of expense accrual amounts; calculating, tracking, and reporting tax adjustments on all assets and monitoring trustee deferred compensation plan accruals and valuations. The Fund will pay its pro rata share of the financial accounting services fee payable to Calamos Advisors based on average assets of the Fund. Certain officers and trustees of the Fund are also officers and directors of Calamos Financial Services LLC ("CFS") and Calamos Advisors. All officers and affiliated trustees serve without direct compensation from the Fund. The Fund has adopted a deferred compensation plan (the "Plan"). Under the Plan, a trustee who is not an "interested person" of Calamos Advisors and has elected to participate in the Plan (a "participating trustee") may defer receipt of all or a portion of his compensation from the Fund. The deferred compensation payable to the participating trustee is credited to the trustee's deferral account as of the business day such compensation would have been paid to the participating trustee. The value of a participating trustee's deferred compensation account at any time is equal to what would be the value if the amounts credited to the account had instead been invested in shares of one or more of the Funds of the Calamos Investment Trust as designated by the trustee. Thus, the value of the account increases with contributions to the account or with increases in the value of the measuring shares, and the value of the account decreases with withdrawals from the account or with declines in the value of the measuring shares. If a participating trustee retires, the trustee may elect to receive payments under the plan in a lump sum or in equal installments over a period of five years. If a participating trustee dies, any amount payable under the Plan will be paid to the trustee's beneficiaries. Deferred compensation investments of $32,361 are included in "Other assets" on the Statement of Assets and Liabilities at April 30, 2005. The Fund's obligation to make payments under the Plan is a general obligation of the Fund and is included in "Payable for deferred compensation to Trustees" on the Statement of Assets and Liabilities at April 30, 2005. NOTE 3 - INVESTMENTS Purchases and sales of investments other than short-term obligations For the six months ended April 30, 2005 were as follows: Purchases $ 247,655,081 Proceeds from sales 258,054,753 Convertible Opportunities and Income Fund 16 SEMIANNUAL REPORT Notes to Financial Statements Notes to Financial Statements (unaudited) The following information is presented on an income tax basis as of April 30, 2005. Differences between amounts for financial statements and Federal income tax purposes are primarily due to timing differences. The cost basis of investments for federal income tax purposes at April 30, 2005 was as follows: Cost basis of investments $ 1,221,676,371 --------------- Gross unrealized appreciation 67,228,076 Gross unrealized depreciation (34,982,889) --------------- Net unrealized appreciation (depreciation) $ 32,245,187 =============== NOTE 4 - INCOME TAXES Distributions during the fiscal year ended October 31, 2004 were characterized for income tax purposes as follows: DISTRIBUTIONS PAID FROM: Net investment income $ 99,594,856 Capital gains 5,444,071 As of October 31, 2004, the components of net assets on a tax basis were as follows: Undistributed ordinary income $ 8,298,735 Undistributed capital gains 49,394,028 ------------- Total undistributed earnings 57,692,763 Accumulated capital and other losses -- Net unrealized gains/(losses) 107,844,425 ------------- Total accumulated earnings/(losses) 165,537,188 Other (80,731) Paid-in capital 642,822,029 ------------- $ 808,278,486 ------------- NOTE 5 - COMMON STOCK There are unlimited common shares of beneficial interest authorized and 45,687,414 shares outstanding at April 30, 2005. Calamos Advisors LLC owned 8,358 of the outstanding shares. Transactions in common shares were as follows: For the Six Months Ended For the Year April 30, 2005 Ended (unaudited) October 31, 2004 --------------------------------------------------------------------------------------------- Beginning shares 44,833,669 43,904,538 Shares sold -- -- Shares issued through reinvestment of distributions 853,745 929,131 ------------------------------------ Ending shares 45,687,414 44,833,669 ==================================== NOTE 6 - FORWARD FOREIGN CURRENCY CONTRACTS The Fund may engage in portfolio hedging with respect to changes in currency exchange rates by entering into foreign currency contracts to purchase or sell currencies. A forward foreign currency contract is a commitment to purchase or sell a foreign currency at a future date at a negotiated forward rate. Risks associated with such contracts include, among other things, movement in the value of the foreign currency relative to the U.S. dollar and the ability of the counterparty to perform. The net unrealized gain, if Convertible Opportunities and Income Fund Notes to Financial Statements SEMIANNUAL REPORT 17 Notes to Financial Statements (unaudited) any, represents the credit risk to the Fund on a forward foreign currency contract. The contracts are valued daily at forward exchange rates and an unrealized gain or loss is recorded. The Fund realizes a gain or loss upon settlement of the contracts. There were no open forward foreign currency contracts at April 30, 2005. NOTE 7 - SYNTHETIC CONVERTIBLE SECURITIES The Fund may establish a "synthetic" convertible instrument by combining separate securities that possess the economic characteristics similar to a convertible security, i.e., fixed-income securities ("fixed-income component") and the right to acquire equity securities ("convertible component"). The fixed-income component is achieved by investing in non-convertible, fixed income securities such as bonds, preferred stocks and money market instruments. The convertible component is achieved by investing in warrants or options to buy common stock at a certain exercise price, or options on a stock index. In establishing a synthetic instrument, the Fund may pool a basket of fixed-income securities and a basket of warrants or options that produce the economic characteristics similar to a convertible security. Within each basket of fixed-income securities and warrants or options, different companies may issue the fixed-income and convertible components, which may be purchased separately and at different times. The Fund may purchase synthetic securities created by other parties, typically investment banks, including convertible structured notes. Convertible structured notes are fixed-income debentures linked to equity. Convertible structured notes have the attributes of a convertible security; however, the investment bank that issued the convertible note assumes the credit risk associated with the investment, rather than the issuer of the underlying common stock into which the note is convertible. Purchasing synthetic convertible securities may offer more flexibility than purchasing a convertible security. Different companies may issue the fixed-income and convertible components, which may be purchased separately and at different times. NOTE 8 - PREFERRED SHARES There are unlimited shares of Auction Market Preferred Shares ("Preferred Shares") authorized. The Preferred Shares have rights as determined by the Board of Trustees. The 15,360 shares of Preferred Shares outstanding consist of seven series, 2,040 shares of M, 2,040 shares of TU, 2,040 shares of W7, 2,400 shares of W28, 2,400 shares of TH7, 2,040 shares of TH28, and 2,400 shares of F. The Preferred Shares have a liquidation value of $25,000 per share plus any accumulated but unpaid dividends whether or not declared. Dividends on the Preferred Shares are cumulative at a rate typically reset every seven and twenty-eight days based on the results of an auction. Dividend rates ranged from 1.90% to 3.45% for the six months ended April 30, 2005. Under the Investment Company Act of 1940, the Fund may not declare dividends or make other distributions on shares of common stock or purchase any such shares if, at the time of the declaration, distribution or purchase, asset coverage with respect to the outstanding Preferred Shares would be less than 200%. The Preferred Shares are redeemable at the option of the Fund, in whole or in part, on any dividend payment date at $25,000 per share plus any accumulated but unpaid dividends. The Preferred Shares are also subject to mandatory redemption at $25,000 per share plus any accumulated but unpaid dividends, whether or not declared, if certain requirements relating to the composition of the assets and liabilities of the Fund as set forth in the Statement of Preferences are not satisfied. The holders of Preferred Shares have voting rights equal to the holders of common stock (one vote per share) and will vote together with holders of shares of common stock as a single class except on matters affecting only the holders of Preferred Shares or the holders of common shares. Convertible Opportunities and Income Fund 18 SEMIANNUAL REPORT Notes to Financial Statements Notes to Financial Statements (unaudited) NOTE 9 - INTEREST RATE TRANSACTIONS The Fund may enter into interest rate swap or cap transactions to attempt to protect itself from increasing dividend or interest expense on its leverage resulting from increasing short-term interest rates. A decline in interest rates may result in a decline in the value of the swap or cap, which may result in a decline in the net asset value of the Fund. In addition, if the counterparty to an interest rate swap or cap defaults, the Fund would not be able to use the anticipated receipts under the swap or cap to offset the dividend or interest payments on the Fund's leverage. At the time an interest rate swap or cap reaches its scheduled termination, there is a risk that the Fund would not be able to obtain a replacement transaction or that the terms of the replacement would not be as favorable as on the expiring transaction. In addition, if the Fund is required to terminate any swap or cap early due to the Fund failing to maintain a required 200% asset coverage of the liquidation value of the outstanding Preferred Shares or the Fund loses its credit rating on its Preferred Shares, then the Fund could be required to make a termination payment, in addition to redeeming all or some of the Preferred Shares. Details of the swap agreements outstanding as of April 30, 2005 were as follows: UNREALIZED TERMINATION NOTIONAL FIXED RATE FLOATING RATE APPRECIATION COUNTERPARTY DATE AMOUNT (000) (FUND PAYS) (FUND RECEIVES) (DEPRECIATION) --------------------------------------------------------------------------------------------------- Merrill Lynch July 3, 2006 $65,000 1.91% 1 month LIBOR $ 1,374,640 Merrill Lynch November 28, 2006 $60,000 2.82% 1 month LIBOR 922,920 Merrill Lynch July 3, 2007 $65,000 2.33% 1 month LIBOR 2,283,375 Merrill Lynch November 28, 2007 $60,000 3.26% 1 month LIBOR 1,140,512 Merrill Lynch July 3, 2008 $70,000 2.69% 1 month LIBOR 2,988,045 Merrill Lynch November 28, 2008 $60,000 3.60% 1 month LIBOR 1,099,500 ------------ $ 9,808,992 ============ NOTE 10 - SECURITIES LENDING During the six months ended April 30, 2005, the Fund lent certain of its securities to broker-dealers and banks. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by the Fund. The Fund continues to receive the equivalent of the interest or dividends paid by the issuer on the securities loaned and also receives an additional return that may be in the form of a fixed fee or a percentage of the collateral. The Fund may pay reasonable fees to persons unaffiliated with the Fund for services in arranging these loans. The Fund has the right to call the loan and obtain the securities loaned at any time on notice of not more than five business days. The Fund does not have the right to vote the securities during the existence of the loan but could call the loan in an attempt to permit voting of the securities in certain circumstances. Upon return of the securities loaned, the cash or cash equivalent collateral will be returned to the borrower. In the event of bankruptcy or other default of the borrower, the Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses, including (a) possible decline in the value of the collateral or in the value of the securities loaned during the period while the Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) the expenses of enforcing its rights. In an effort to reduce these risks, Calamos Advisors LLC and the security lending agent will monitor the creditworthiness of the firms to which the Fund lends securities. At April 30, 2005, the Fund had securities valued at $146,344,981 that were on loan to broker-dealers and banks and $152,104,340 in cash or cash equivalent collateral. Convertible Opportunities and Income Fund Notes to Financial Statements SEMIANNUAL REPORT 19 FINANCIAL HIGHLIGHTS Selected data for a share outstanding throughout each period were as follows: For the Six June 26, Months Ended 2002* April 30, For the Year Ended through (unaudited) October 31, October 31, ------------------------------------------------------ 2005 2004 2003 2002 ------------------------------------------------------------------------------------------------------------------------------- Net asset value, beginnning of period $ 18.03 $ 18.01 $ 13.56 $ 14.32(a) ------------------------------------------------------------------------------------------------------------------------------- Income from investment operations: Net investment income (loss) 0.87 1.91 1.77(b) 0.39(c) ------------------------------------------------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) from investments, written options, foreign currency and interest rate swaps (0.59) 0.52 4.38(b) (0.77) ------------------------------------------------------------------------------------------------------------------------------- Dividends to preferred shareholders from: Net investment income (common share equivalent basis) (0.05) (0.11) (0.06) (0.01) ------------------------------------------------------------------------------------------------------------------------------- Capital gains (common share equivalent basis) (0.06) -- -- -- ------------------------------------------------------------------------------------------------------------------------------- Total from investment operations 0.17 2.32 6.09 (0.39) ------------------------------------------------------------------------------------------------------------------------------- Less dividends to common shareholders from: Net investment income (0.93) (1.80) (1.64) (0.29) ------------------------------------------------------------------------------------------------------------------------------- Capital gains (1.04) (0.45) -- -- ------------------------------------------------------------------------------------------------------------------------------- Capital charge resulting from issuance of common and preferred shares -- (0.05) --(d) (0.08) ------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 16.23 $ 18.03 $ 18.01 $ 13.56 ------------------------------------------------------------------------------------------------------------------------------- Market value, end of period $ 18.51 $ 20.50 $ 19.60 $ 14.20 ------------------------------------------------------------------------------------------------------------------------------- Total investment return based on(e): Net asset value (0.51)% 12.65% 46.48% (3.33)% ------------------------------------------------------------------------------------------------------------------------------- Market value (0.20)% 17.69% 52.22% (3.33)% ------------------------------------------------------------------------------------------------------------------------------- Ratios and supplemental data: Net assets applicable to common shareholders, end of period (000's omitted) $741,306 $808,278 $790,764 $586,893 ------------------------------------------------------------------------------------------------------------------------------- Preferred shares, at redemption value ($25,000 per share liquidation $384,000 $384,000 $204,000 $204,000 preference) (000's omitted) ------------------------------------------------------------------------------------------------------------------------------- Ratios to average net assets applicable to common shareholders: Net expenses(f) 1.06% 1.00% 0.86% 0.79% ------------------------------------------------------------------------------------------------------------------------------- Gross expenses prior to waiver of expenses by the advisor(f) 1.43% 1.37% 1.18% 1.06% ------------------------------------------------------------------------------------------------------------------------------- Net investment income (loss)(f) 9.78% 10.56% 10.89%(b) 8.21% ------------------------------------------------------------------------------------------------------------------------------- Preferred share dividends(f) 0.60% 0.65% 0.39% 0.23% ------------------------------------------------------------------------------------------------------------------------------- Net investment income (loss), net of preferred share dividends(f) 9.18% 9.91% 10.50%(b) 7.99% ------------------------------------------------------------------------------------------------------------------------------- Portfolio turnover rate 22% 54% 42% 2% ------------------------------------------------------------------------------------------------------------------------------- Asset coverage per preferred share, at end of period(g) $ 73,283 $ 77,624 $121,907 $ 96,934 ------------------------------------------------------------------------------------------------------------------------------- * Commencement of operations. (a) Net of sales load of $.675 on initial shares issued and beginning net asset value of $14,325. (b) Interest rate swap payments reclassified from net investment income (loss) to net realized and unrealized gain (loss) on investments, foreign currency and interest rate swaps. (c) Based on average shares method. (d) Amount equated to less than $0.05 per common share. (e) Total investment return is calculated assuming a purchase of common stock on the opening of the first day and a sale on the closing of the last day of the period reported. Dividends and distributions are assumed, for purposes of this calculation, to be reinvested at prices obtained under the Fund's dividend reinvestment plan. Total return is not annualized for periods less than one year. Brokerage commissions are not reflected. (f) Annualized for periods less than one year. (g) Calculated by subtracting the Fund's total liabilities (not including Preferred Shares) from the Fund's total assets and dividing this by the number of preferred shares outstanding. Convertible Opportunities and Income Fund 20 SEMIANNUAL REPORT Financial Highlights REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM To the Board of Trustees and Shareholders of CALAMOS Convertible Opportunities and Income Fund: We have reviewed the accompanying statement of assets and liabilities, including the schedule of investments, of CALAMOS Convertible Opportunities and Income Fund (the "Fund") as of April 30, 2005, and the related statements of operations and changes in net assets and the financial highlights for the semi-annual period then ended. These interim financial statements and financial highlights are the responsibility of the Fund's management. We conducted our review in accordance with standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion. Based on our review, we are not aware of any material modifications that should be made to such interim financial statements and financial highlights for them to be in conformity with accounting principles generally accepted in the United States of America. We have previously audited, in accordance with standards of the Public Company Accounting Oversight Board (United States), the statement of changes in net assets for the year ended October 31, 2004 and the financial highlights for each of the two years in the period ended October 31, 2004; and in our report dated December 21, 2004, we expressed an unqualified opinion on such statement of changes in net assets and financial highlights. /s/ Deloitte & Touche LLP Chicago, Illinois June 20, 2005 Convertible Opportunities and Income Fund Report of Independent Registered Public Accounting Firm SEMIANNUAL REPORT 21 OTHER INFORMATION (UNAUDITED) RESULTS OF SHAREHOLDER MEETING. The Annual Meeting of Shareholders of the Fund was held on April 6, 2005 where shareholders voted on the elections of trustees. With regard to the election, each trustee standing for election was elected by the shareholders as follows: # OF COMMON TRUSTEES AND PREFERRED SHARES -------------------------------------------------------------------------------- FOR WITHHELD ------------------------ John P. Calamos, Sr. 41,061,167 404,814 Weston W. Marsh 41,053,927 412,054 # OF PREFERRED SHARES ------------------------ FOR WITHHELD ------------------------ William R. Rybak 10,536 51 The other trustees of the Fund whose terms did not expire in 2005 are Nick P. Calamos, Joe F. Hanauer, John E. Neal and Stephen B. Timbers. Convertible Opportunities and Income Fund 22 SEMIANNUAL REPORT Other Information This page intentionally left blank. This page intentionally left blank. This page intentionally left blank. [LOGO] CALAMOS INVESTMENTS(R) -------------------------------------------------------------------------------- Calamos Investments | 1111 E. Warrenville Road | Naperville, IL 60563-1463 | 800.582.6959 | www.calamos.com -------------------------------------------------------------------------------- A description of the Calamos Proxy Voting Policies and Procedures is available free of charge upon request by calling (800) 582-6959, by visiting the Calamos website at www.calamos.com, or by writing Calamos at: Calamos Investments, Attn: Client Services, 1111 E. Warrenville Road, Naperville, IL 60563. The Fund's proxy voting record for the twelve month period ended June 30, 2004, is also available upon request by calling or writing Calamos Investments and by visiting the SEC Web site at www.sec.gov. The Fund files a complete list of its portfolio holdings with the SEC for the first and third quarters each fiscal year on Form N-Q. The Form N-Q is available free of charge, upon request, by calling or writing Calamos Investments or by visiting the SEC website. You may also review or, for a fee, copy the forms at the SECs Public Reference Room in Washington, D.C. (202) 942-8090. FOR 24 HOUR SHAREHOLDER ASSISTANCE 800.432.8224 TO OBTAIN INFORMATION 800.582.6959 VISIT OUR WEB SITE www.calamos.com INVESTMENT ADVISOR Calamos Advisors LLC 1111 E. Warrenville Road Naperville, IL 60563-1463 FUND ACCOUNTING AGENT State Street Bank and Trust Company 225 Franklin Street Boston, MA 02111 CUSTODIAN AND TRANSFER AGENT The Bank of New York P.O. Box 11258 Church Street Station New York, NY 10286 800.524.4458 INDEPENDENT ACCOUNTANTS Deloitte and Touche LLP Chicago, IL LEGAL COUNSEL Bell, Boyd & Lloyd LLC Chicago, IL AS OF JULY 15, 2005, CALAMOS INVESTMENTS WILL BE LOCATED AT: 2020 CALAMOS COURT NAPERVILLE, IL 60563 (C) 2005 Calamos Holdings LLC. All Rights Reserved. Calamos(R), CALAMOS INVESTMENTS(R), STRATEGIES FOR SERIOUS MONEY(R) and the Calamos(R) logo are registered trademarks of Calamos Holdings LLC. CHISAN 1790 2005 ITEM 2. CODE OF ETHICS. Not applicable. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable. ITEM 6. SCHEDULE OF INVESTMENTS Included in the Report to Shareholders in Item 1. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable. ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS. -------------------- ----------------- -------------- --------------------- ---------------------------- (C) TOTAL NUMBER (D) MAXIMUM NUMBER (A) TOTAL OF SHARES (OR (OR APPROXIMATE DOLLAR NUMBER OF (B) AVERAGE UNITS) PURCHASED VALUE) OF SHARES (OR SHARES (OR PRICE PAID AS PART OF PUBLICLY UNITS) THAT MAY YET BE UNITS) PER SHARE ANNOUNCED PLANS PURCHASED UNDER THE PERIOD PURCHASED (OR UNIT) OR PROGRAMS PLANS OR PROGRAMS -------------------- ----------------- -------------- --------------------- ---------------------------- November 1 to 0 0 0 0 November 30 -------------------- ----------------- -------------- --------------------- ---------------------------- December 1 to 3,290 $21.37 0 0 December 31 -------------------- ----------------- -------------- --------------------- ---------------------------- January 1 to 0 0 0 0 January 31 -------------------- ----------------- -------------- --------------------- ---------------------------- February 1 to 0 0 0 0 February 28 -------------------- ----------------- -------------- --------------------- ---------------------------- March 1 to 0 0 0 0 March 31 -------------------- ----------------- -------------- --------------------- ---------------------------- April 1 to April 0 0 0 0 30 -------------------- ----------------- -------------- --------------------- ---------------------------- Total 0 0 0 0 -------------------- ----------------- -------------- --------------------- ---------------------------- ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS No material changes. ITEM 11. CONTROLS AND PROCEDURES. a) The registrant's principal executive officer and principal financial officer have evaluated the registrant's disclosure controls and procedures within 90 days of this filing and have concluded that the registrant's disclosure controls and procedures were effective, as of that date, in ensuring that information required to be disclosed by the registrant in this Form N-CSR was recorded, processed, summarized, and reported timely. b) There were no changes in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) that occurred during the second fiscal quarter of the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 12. EXHIBITS. (a)(1) Code of Ethics -- Not applicable. (a)(2)(i) Certification of Principal Executive Officer. (a)(2)(ii) Certification of Principal Financial Officer. SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. Calamos Convertible Opportunities and Income Fund By: /s/ John P. Calamos, Sr. ----------------------------------------------------------------------------- Name: John P. Calamos, Sr. Title: Principal Executive Officer Date: June 29, 2005 By: /s/ Patrick H. Dudasik ----------------------------------------------------------------------------- Name: Patrick H. Dudasik Title: Principal Financial Officer Date: June 29, 2005 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed by the following persons on behalf of the registrant and in the capacities and on the dates indicated. Calamos Convertible Opportunities and Income Fund By: /s/ John P. Calamos, Sr. ----------------------------------------------------------------------------- Name: John P. Calamos, Sr. Title: Principal Executive Officer Date: June 29, 2005 By: /s/ Patrick H. Dudasik ----------------------------------------------------------------------------- Name: Patrick H. Dudasik Title: Principal Financial Officer Date: June 29, 2005