UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-Q QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANIES INVESTMENT COMPANY ACT FILE NUMBER: 811-21484 EXACT NAME OF REGISTRANT AS SPECIFIED IN CHARTER: Calamos Strategic Total Return Fund ADDRESS OF PRINCIPAL EXECUTIVE OFFICES: 2020 Calamos Court, Naperville Illinois 60563 NAME AND ADDRESS OF AGENT FOR SERVICE: James S. Hamman, Jr., Secretary, Calamos Advisors, LLC, 2020 Calamos Court, Naperville, Illinois 60563 REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (630) 245-7200 DATE OF FISCAL YEAR END: October 31, 2007 DATE OF REPORTING PERIOD: January 31, 2007 CALAMOS STRATEGIC TOTAL RETURN FUND ITEM 1. SCHEDULE OF INVESTMENTS January 31, 2007 (UNAUDITED) CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- CORPORATE BONDS (38.4%) CONSUMER DISCRETIONARY (13.1%) $ 4,431,000 Asbury Automotive Group, Inc. 8.000%, 03/15/14 $ 4,519,620 7,090,000 Aztar Corp. 7.875%, 06/15/14 7,749,370 10,064,000 Beazer Homes USA, Inc. 8.375%, 04/15/12 10,391,080 4,431,000 Boyd Gaming Corp. < 7.750%, 12/15/12 4,580,546 8,198,000 DIRECTV Financing Company, Inc. 8.375%, 03/15/13 8,618,148 EchoStar DBS Corp. 13,738,000 7.125%, 02/01/16 13,858,207 1,950,000 6.625%, 10/01/14 1,915,875 5,761,000 GBP EMI Group, PLC 8.250%, 05/20/08 11,823,438 18,612,000 Expedia, Inc.* < 7.456%, 08/15/18 19,206,988 7,977,000 GameStop Corp. < 8.000%, 10/01/12 8,475,563 13,294,000 General Motors Corp. 7.200%, 01/15/11 12,994,885 17,726,000 Goodyear Tire & Rubber Company < 7.857%, 08/15/11 18,213,465 7,534,000 Group 1 Automotive, Inc. < 8.250%, 08/15/13 7,797,690 15,067,000 Hanes Brands, Inc.* < ++ 8.735%, 12/15/14 15,556,677 7,977,000 Hovnanian Enterprises, Inc. < 7.750%, 05/15/13 7,977,000 7,977,000 Idearc, Inc.* 8.000%, 11/15/16 8,146,511 6,744,000 Jarden Corp. < 9.750%, 05/01/12 7,173,930 2,874,000 Kellwood Company 7.625%, 10/15/17 2,628,397 6,647,000 Landry's Restaurants, Inc. 7.500%, 12/15/14 6,580,530 4,431,000 Liberty Media Corp. 8.250%, 02/01/30 4,401,419 15,289,000 Linens 'n Things, Inc. < ++ 10.985%, 01/15/14 14,906,775 Mandalay Resort Group < 12,891,000 10.250%, 08/01/07 13,197,161 5,761,000 7.625%, 07/15/13 5,732,195 11,522,000 Meritage Corp. 7.000%, 05/01/14 11,118,730 5,318,000 NCL Holding, ASA 10.625%, 07/15/14 5,437,655 4,431,000 Oxford Industries, Inc. 8.875%, 06/01/11 4,608,240 Pinnacle Entertainment, Inc. 7,977,000 8.250%, 03/15/12 8,206,339 4,560,000 8.750%, 10/01/13 < 4,845,000 PRINCIPAL AMOUNT VALUE ------------ --------------- $ 8,876,000 Reader's Digest Association, Inc. 6.500%, 03/01/11 $ 9,120,090 11,522,000 Royal Caribbean Cruises, Ltd. 7.500%, 10/15/27 11,370,244 16,840,000 Service Corp. International 6.750%, 04/01/16 16,545,300 13,294,000 Standard Pacific Corp. < 9.250%, 04/15/12 13,726,055 1,950,000 Station Casinos, Inc. 6.875%, 03/01/16 1,794,000 4,431,000 Vail Resorts, Inc. 6.750%, 02/15/14 4,386,690 Warner Music Group 16,396,000 7.375%, 04/15/14 < 16,232,040 2,216,000 GBP 8.125%, 04/15/14 4,473,500 1,950,000 Wynn Las Vegas, LLC < 6.625%, 12/01/14 1,940,250 --------------- 330,249,603 --------------- CONSUMER STAPLES (2.9%) 1,773,000 Alimentation Couche-Tard Inc. 7.500%, 12/15/13 1,812,893 7,534,000 Central Garden & Pet Company 9.125%, 02/01/13 7,891,865 13,073,000 Chiquita Brands International, Inc. < 7.500%, 11/01/14 11,831,065 10,192,000 Del Monte Foods Company 8.625%, 12/15/12 10,803,520 15,067,000 Jean Coutu Group, Inc. 8.500%, 08/01/14 15,745,015 9,749,000 NBTY, Inc. 7.125%, 10/01/15 9,773,372 Pilgrim's Pride Corp. 10,636,000 8.375%, 05/01/17 < 10,529,640 5,318,000 7.625%, 05/01/15 5,291,410 --------------- 73,678,780 --------------- ENERGY (5.0%) 10,636,000 Arch Western Finance, LLC 6.750%, 07/01/13 10,556,230 Chesapeake Energy Corp. 6,204,000 6.875%, 01/15/16 < 6,172,980 3,545,000 7.500%, 06/15/14 3,664,644 4,773,000 Comstock Resources, Inc. 6.875%, 03/01/12 4,599,979 1,764,000 Energy Partners, Ltd. 8.750%, 08/01/10 1,799,280 13,117,000 Giant Industries, Inc. 8.000%, 05/15/14 14,149,964 4,431,000 Houston Exploration Company 7.000%, 06/15/13 4,486,387 4,431,000 Petrohawk Energy Corp. 7.125%, 04/01/12 4,253,760 Petroleo Brasileiro, SA 14,624,000 9.125%, 07/02/13 17,128,360 13,738,000 8.375%, 12/10/18 16,293,268 1,773,000 Premcor Refining Group, Inc. 7.500%, 06/15/15 1,820,367 See accompanying notes to Schedule of Investments 1 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- $ 4,431,000 Superior Energy Services, Inc. 6.875%, 06/01/14 $ 4,364,535 10,037,000 Swift Energy Company < 9.375%, 05/01/12 10,589,035 6,692,000 Whiting Petroleum Corp. 7.250%, 05/01/12 6,675,270 17,726,000 Williams Companies, Inc. 7.750%, 06/15/31 18,700,930 --------------- 125,254,989 --------------- FINANCIALS (3.7%) 35,452,000 Dow Jones & Company, Inc.* < 8.000%, 12/29/11 36,005,051 E*TRADE Financial Corp. 17,159,000 7.375%, 09/15/13 17,888,257 11,832,000 7.875%, 12/01/15 < 12,719,400 3,013,000 8.000%, 06/15/11 3,159,884 13,294,000 Leucadia National Corp. 7.000%, 08/15/13 13,393,705 9,306,000 Senior Housing Properties Trust 8.625%, 01/15/12 10,143,540 --------------- 93,309,837 --------------- HEALTH CARE (3.0%) 4,431,000 Ameripath, Inc. 10.500%, 04/01/13 4,829,790 2,659,000 Angiotech Pharmaceuticals, Inc. < 7.750%, 04/01/14 2,459,575 4,431,000 Bio-Rad Laboratories, Inc. 7.500%, 08/15/13 4,608,240 5,096,000 Biovail Corp. 7.875%, 04/01/10 5,229,770 1,950,000 DaVita, Inc. < 7.250%, 03/15/15 1,984,125 HCA, Inc.* 3,102,000 9.125%, 11/15/14 < 3,307,508 1,329,000 9.250%, 11/15/16 1,415,385 1,418,000 Omnicare, Inc. < 6.875%, 12/15/15 1,407,365 9,749,000 Psychiatric Solutions, Inc. 7.750%, 07/15/15 9,773,372 15,687,000 Tenet Healthcare Corp. 9.250%, 02/01/15 15,726,217 11,522,000 Valeant Pharmaceuticals International 7.000%, 12/15/11 11,118,730 11,965,000 Vanguard Health Systems, Inc. < 9.000%, 10/01/14 12,308,994 --------------- 74,169,071 --------------- INDUSTRIALS (2.8%) 5,894,000 American Airlines, Inc. < 7.250%, 02/05/09 6,041,350 2,659,000 Armor Holdings, Inc. 8.250%, 08/15/13 2,791,950 14,624,000 CNH Global, NV 9.250%, 08/01/11 15,574,560 1,773,000 FTI Consulting, Inc. < 7.625%, 06/15/13 1,823,974 PRINCIPAL AMOUNT VALUE ------------ --------------- $ 4,431,000 Gardner Denver, Inc. 8.000%, 05/01/13 $ 4,641,472 8,420,000 General Cable Corp. < 9.500%, 11/15/10 8,925,200 4,015,000 H&E Equipment Service, Inc. 8.375%, 07/15/16 4,265,938 3,328,000 Manitowoc Company, Inc. 10.500%, 08/01/12 3,573,440 4,431,000 Sequa Corp. 8.875%, 04/01/08 4,575,007 5,096,000 Trinity Industries, Inc. 6.500%, 03/15/14 5,032,300 4,431,000 WESCO International, Inc. 7.500%, 10/15/17 4,475,310 4,431,000 Westinghouse Air Brake Technologies Corp. 6.875%, 07/31/13 4,408,845 4,875,000 Williams Scotsman International, Inc. < 8.500%, 10/01/15 5,094,375 --------------- 71,223,721 --------------- INFORMATION TECHNOLOGY (2.1%) 16,195,000 Advanced Micro Devices, Inc. 7.750%, 11/01/12 16,599,875 1,972,000 Anixter International, Inc. 5.950%, 03/01/15 1,875,865 1,950,000 Avago Technologies* < 11.875%, 12/01/15 2,145,000 7,534,000 Celestica, Inc. < 7.875%, 07/01/11 7,402,155 15,067,000 Freescale Semiconductor, Inc.* < 8.875%, 12/15/14 15,067,000 975,000 Sanmina-SCI Corp. 8.125%, 03/01/16 933,563 9,306,000 SunGard Data Systems, Inc. < 9.125%, 08/15/13 9,841,095 --------------- 53,864,553 --------------- MATERIALS (2.8%) 2,216,000 Agrium, Inc. 7.125%, 05/23/36 2,332,925 2,659,000 Century Aluminum Company < 7.500%, 08/15/14 2,712,180 7,737,000 Freeport-McMoRan Copper & Gold, Inc. 10.125%, 02/01/10 8,172,206 1,950,000 Gibraltar Industries, Inc. 8.000%, 12/01/15 1,930,500 Ineos Group Holdings, PLC* 11,965,000 EUR 7.875%, 02/15/16 14,736,873 2,216,000 8.500%, 02/15/16 < 2,132,900 8,863,000 IPSCO, Inc. 8.750%, 06/01/13 9,549,883 2,659,000 P.H. Glatfelter Company 7.125%, 05/01/16 2,692,238 Union Carbide Corp. 9,705,000 7.875%, 04/01/23 < 10,395,744 7,666,000 7.500%, 06/01/25 7,915,459 See accompanying notes to Schedule of Investments 2 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- $ 6,514,000 Westlake Chemical Corp. < 6.625%, 01/15/16 $ 6,416,290 --------------- 68,987,198 --------------- TELECOMMUNICATION SERVICES (2.0%) 11,522,000 Alamosa Holdings, Inc. < 8.500%, 01/31/12 12,218,747 1,507,000 Citizens Communications Company 9.000%, 08/15/31 1,631,328 3,988,000 IPCS, Inc. 11.500%, 05/01/12 4,426,680 7,977,000 Leap Wireless International, Inc.* 9.375%, 11/01/14 8,415,735 5,761,000 CAD Rogers Cable, Inc. 7.250%, 12/15/11 5,347,234 4,431,000 Sprint Nextel Corp. 11.000%, 07/31/10 4,762,926 4,431,000 Syniverse Technologies, Inc. 7.750%, 08/15/13 4,464,232 7,977,000 Windstream Corp. 8.625%, 08/01/16 8,744,786 --------------- 50,011,668 --------------- UTILITIES (1.0%) 10,636,000 Edison International 7.730%, 06/15/09 11,008,260 15,953,000 TXU Corp. 6.500%, 11/15/24 14,852,945 --------------- 25,861,205 --------------- TOTAL CORPORATE BONDS (Cost $950,028,881) 966,610,625 --------------- CONVERTIBLE BONDS (13.6%) CONSUMER DISCRETIONARY (5.5%) 7,000,000 General Motors Corp. 6.250%, 07/15/33 6,678,000 5,680,000 Liberty Media Corp. (CBS Corp.) < & 3.250%, 03/15/31 4,913,200 16,500,000 GBP Punch Taverns Redwood Jersey Company Ltd. 5.000%, 12/14/10 39,873,552 21,500,000 The Interpublic Group of Companies, Inc.* ++ 5.710%, 06/15/09 27,827,450 United Auto Group, Inc. 10,151,000 3.500%, 04/01/26* 11,838,604 5,849,000 3.500%, 04/01/26 6,821,396 32,000,000 Walt Disney Company < 2.125%, 04/15/23 39,960,000 --------------- 137,912,202 --------------- FINANCIALS (1.1%) 4,350,000 Host Hotels & Resorts, Inc.* 3.250%, 04/15/24 6,911,063 18,750,000 Travelers Property Casualty Corp. 4.500%, 04/15/32 19,320,000 --------------- 26,231,063 --------------- PRINCIPAL AMOUNT VALUE ------------ --------------- HEALTH CARE (0.9%) $ 20,000,000 Wyeth < ++ 4.877%, 01/15/24 $ 21,486,000 --------------- INDUSTRIALS (1.2%) 16,000,000 Lockheed Martin Corp. < ++ 5.124%, 08/15/33 22,114,880 7,500,000 Quanta Services, Inc.* 3.750%, 04/30/26 8,615,625 --------------- 30,730,505 --------------- INFORMATION TECHNOLOGY (2.2%) 17,000,000 Electronic Data Systems Corp. < 3.875%, 07/15/23 17,828,750 8,000,000 Mentor Graphics Corp.* 6.250%, 03/01/26 10,700,000 27,970,000 Vishay Intertechnology, Inc. 3.625%, 08/01/23 27,900,075 --------------- 56,428,825 --------------- UTILITIES (2.7%) 20,000,000 CenterPoint Energy, Inc. 3.750%, 05/15/23 30,600,000 5,750,000 EUR International Power, PLC 3.250%, 07/20/13 9,126,250 8,750,000 GBP Scottish & Southern Energy, PLC 3.750%, 10/29/09 29,120,795 --------------- 68,847,045 --------------- TOTAL CONVERTIBLE BONDS (Cost $296,992,245) 341,635,640 --------------- SYNTHETIC CONVERTIBLE SECURITIES (5.8%) CORPORATE BONDS (4.9%) CONSUMER DISCRETIONARY (1.7%) 569,000 Asbury Automotive Group, Inc. 8.000%, 03/15/14 580,380 910,000 Aztar Corp. 7.875%, 06/15/14 994,630 1,291,000 Beazer Homes USA, Inc. 8.375%, 04/15/12 1,332,957 569,000 Boyd Gaming Corp. < 7.750%, 12/15/12 588,204 1,052,000 DIRECTV Financing Company, Inc. 8.375%, 03/15/13 1,105,915 EchoStar DBS Corp. 1,762,000 7.125%, 02/01/16 1,777,417 250,000 6.625%, 10/01/14 245,625 739,000 GBP EMI Group, PLC 8.250%, 05/20/08 1,516,667 2,388,000 Expedia, Inc.* < 7.456%, 08/15/18 2,464,340 1,023,000 GameStop Corp. < 8.000%, 10/01/12 1,086,938 1,706,000 General Motors Corp. 7.200%, 01/15/11 1,667,615 2,274,000 Goodyear Tire & Rubber Company < 7.857%, 08/15/11 2,336,535 See accompanying notes to Schedule of Investments 3 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- $ 966,000 Group 1 Automotive, Inc. < 8.250%, 08/15/13 $ 999,810 1,933,000 Hanes Brands, Inc.* < ++ 8.735%, 12/15/14 1,995,822 1,023,000 Hovnanian Enterprises, Inc. < 7.750%, 05/15/13 1,023,000 1,023,000 Idearc, Inc.* 8.000%, 11/15/16 1,044,739 865,000 Jarden Corp. < 9.750%, 05/01/12 920,144 369,000 Kellwood Company 7.625%, 10/15/17 337,466 853,000 Landry's Restaurants, Inc. 7.500%, 12/15/14 844,470 569,000 Liberty Media Corp. 8.250%, 02/01/30 565,201 1,961,000 Linens 'n Things, Inc. < ++ 10.985%, 01/15/14 1,911,975 Mandalay Resort Group < 1,654,000 10.250%, 08/01/07 1,693,282 739,000 7.625%, 07/15/13 735,305 1,478,000 Meritage Corp. 7.000%, 05/01/14 1,426,270 682,000 NCL Holding, ASA 10.625%, 07/15/14 697,345 569,000 Oxford Industries, Inc. 8.875%, 06/01/11 591,760 Pinnacle Entertainment, Inc. 1,023,000 8.250%, 03/15/12 1,052,411 585,000 8.750%, 10/01/13 < 621,563 1,139,000 Reader's Digest Association, Inc. 6.500%, 03/01/11 1,170,323 1,478,000 Royal Caribbean Cruises, Ltd. 7.500%, 10/15/27 1,458,533 2,160,000 Service Corp. International 6.750%, 04/01/16 2,122,200 1,706,000 Standard Pacific Corp. < 9.250%, 04/15/12 1,761,445 250,000 Station Casinos, Inc. 6.875%, 03/01/16 230,000 569,000 Vail Resorts, Inc. 6.750%, 02/15/14 563,310 Warner Music Group 2,104,000 7.375%, 04/15/14 < 2,082,960 284,000 GBP 8.125%, 04/15/14 573,319 250,000 Wynn Las Vegas, LLC < 6.625%, 12/01/14 248,750 --------------- 42,368,626 --------------- CONSUMER STAPLES (0.4%) 227,000 Alimentation Couche-Tard Inc. 7.500%, 12/15/13 232,108 966,000 Central Garden & Pet Company 9.125%, 02/01/13 1,011,885 1,677,000 Chiquita Brands International, Inc. < 7.500%, 11/01/14 1,517,685 1,308,000 Del Monte Foods Company 8.625%, 12/15/12 1,386,480 PRINCIPAL AMOUNT VALUE ------------ --------------- $ 1,933,000 Jean Coutu Group, Inc. 8.500%, 08/01/14 $ 2,019,985 1,251,000 NBTY, Inc. 7.125%, 10/01/15 1,254,127 Pilgrim's Pride Corp. 1,364,000 8.375%, 05/01/17 < 1,350,360 682,000 7.625%, 05/01/15 678,590 --------------- 9,451,220 --------------- ENERGY (0.6%) 1,364,000 Arch Western Finance, LLC 6.750%, 07/01/13 1,353,770 Chesapeake Energy Corp. 796,000 6.875%, 01/15/16 < 792,020 455,000 7.500%, 06/15/14 470,356 612,000 Comstock Resources, Inc. 6.875%, 03/01/12 589,815 226,000 Energy Partners, Ltd. 8.750%, 08/01/10 230,520 1,683,000 Giant Industries, Inc. 8.000%, 05/15/14 1,815,536 569,000 Houston Exploration Company 7.000%, 06/15/13 576,113 569,000 Petrohawk Energy Corp. 7.125%, 04/01/12 546,240 Petroleo Brasileiro, SA 1,876,000 9.125%, 07/02/13 2,197,265 1,762,000 8.375%, 12/10/18 2,089,732 227,000 Premcor Refining Group, Inc. 7.500%, 06/15/15 233,065 569,000 Superior Energy Services, Inc. 6.875%, 06/01/14 560,465 1,288,000 Swift Energy Company < 9.375%, 05/01/12 1,358,840 858,000 Whiting Petroleum Corp. 7.250%, 05/01/12 855,855 2,274,000 Williams Companies, Inc. 7.750%, 06/15/31 2,399,070 --------------- 16,068,662 --------------- FINANCIALS (0.5%) 4,548,000 Dow Jones & Company, Inc.* < 8.000%, 12/29/11 4,618,949 E*TRADE Financial Corp. 2,201,000 7.375%, 09/15/13 2,294,543 1,518,000 7.875%, 12/01/15 < 1,631,850 387,000 8.000%, 06/15/11 405,866 1,706,000 Leucadia National Corp. 7.000%, 08/15/13 1,718,795 1,194,000 Senior Housing Properties Trust 8.625%, 01/15/12 1,301,460 --------------- 11,971,463 --------------- HEALTH CARE (0.4%) 569,000 Ameripath, Inc. 10.500%, 04/01/13 620,210 341,000 Angiotech Pharmaceuticals, Inc. < 7.750%, 04/01/14 315,425 See accompanying notes to Schedule of Investments 4 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- $ 569,000 Bio-Rad Laboratories, Inc. 7.500%, 08/15/13 $ 591,760 654,000 Biovail Corp. 7.875%, 04/01/10 671,168 250,000 DaVita, Inc. < 7.250%, 03/15/15 254,375 HCA, Inc.* 398,000 9.125%, 11/15/14 < 424,368 171,000 9.250%, 11/15/16 182,115 182,000 Omnicare, Inc. < 6.875%, 12/15/15 180,635 1,251,000 Psychiatric Solutions, Inc. 7.750%, 07/15/15 1,254,127 2,013,000 Tenet Healthcare Corp. 9.250%, 02/01/15 2,018,032 1,478,000 Valeant Pharmaceuticals International 7.000%, 12/15/11 1,426,270 1,535,000 Vanguard Health Systems, Inc. < 9.000%, 10/01/14 1,579,131 --------------- 9,517,616 --------------- INDUSTRIALS (0.4%) 756,000 American Airlines, Inc. < 7.250%, 02/05/09 774,900 341,000 Armor Holdings, Inc. 8.250%, 08/15/13 358,050 1,876,000 CNH Global, NV 9.250%, 08/01/11 1,997,940 227,000 FTI Consulting, Inc. < 7.625%, 06/15/13 233,526 569,000 Gardner Denver, Inc. 8.000%, 05/01/13 596,027 1,080,000 General Cable Corp. < 9.500%, 11/15/10 1,144,800 515,000 H&E Equipment Service, Inc. 8.375%, 07/15/16 547,188 427,000 Manitowoc Company, Inc. 10.500%, 08/01/12 458,491 569,000 Sequa Corp. 8.875%, 04/01/08 587,493 654,000 Trinity Industries, Inc. 6.500%, 03/15/14 645,825 569,000 WESCO International, Inc. 7.500%, 10/15/17 574,690 569,000 Westinghouse Air Brake Technologies Corp. 6.875%, 07/31/13 566,155 625,000 Williams Scotsman International, Inc. < 8.500%, 10/01/15 653,125 --------------- 9,138,210 --------------- INFORMATION TECHNOLOGY (0.3%) 2,078,000 Advanced Micro Devices, Inc. 7.750%, 11/01/12 2,129,950 253,000 Anixter International, Inc. 5.950%, 03/01/15 240,666 250,000 Avago Technologies* < 11.875%, 12/01/15 275,000 PRINCIPAL AMOUNT VALUE ------------ --------------- $ 966,000 Celestica, Inc. < 7.875%, 07/01/11 $ 949,095 1,933,000 Freescale Semiconductor, Inc.* < 8.875%, 12/15/14 1,933,000 125,000 Sanmina-SCI Corp. 8.125%, 03/01/16 119,688 1,194,000 SunGard Data Systems, Inc. < 9.125%, 08/15/13 1,262,655 --------------- 6,910,054 --------------- MATERIALS (0.3%) 284,000 Agrium, Inc. 7.125%, 05/23/36 298,985 341,000 Century Aluminum Company < 7.500%, 08/15/14 347,820 993,000 Freeport-McMoRan Copper & Gold, Inc. 10.125%, 02/01/10 1,048,856 250,000 Gibraltar Industries, Inc. 8.000%, 12/01/15 247,500 Ineos Group Holdings, PLC* 1,535,000 EUR 7.875%, 02/15/16 1,890,606 284,000 8.500%, 02/15/16 < 273,350 1,137,000 IPSCO, Inc. 8.750%, 06/01/13 1,225,117 341,000 P.H. Glatfelter Company 7.125%, 05/01/16 345,263 Union Carbide Corp. 1,245,000 7.875%, 04/01/23 < 1,333,612 984,000 7.500%, 06/01/25 1,016,020 836,000 Westlake Chemical Corp. < 6.625%, 01/15/16 823,460 --------------- 8,850,589 --------------- TELECOMMUNICATION SERVICES (0.2%) 1,478,000 Alamosa Holdings, Inc. < 8.500%, 01/31/12 1,567,376 193,000 Citizens Communications Company 9.000%, 08/15/31 208,922 512,000 IPCS, Inc. 11.500%, 05/01/12 568,320 1,023,000 Leap Wireless International, Inc.* 9.375%, 11/01/14 1,079,265 739,000 CAD Rogers Cable, Inc. 7.250%, 12/15/11 685,924 569,000 Sprint Nextel Corp. 11.000%, 07/31/10 611,624 569,000 Syniverse Technologies, Inc. 7.750%, 08/15/13 573,267 1,023,000 Windstream Corp. 8.625%, 08/01/16 1,121,464 --------------- 6,416,162 --------------- UTILITIES (0.1%) 1,364,000 Edison International 7.730%, 06/15/09 1,411,740 See accompanying notes to Schedule of Investments 5 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- $ 2,047,000 TXU Corp. 6.500%, 11/15/24 $ 1,905,847 --------------- 3,317,587 --------------- TOTAL CORPORATE BONDS 124,010,189 --------------- NUMBER OF CONTRACTS VALUE ------------ --------------- OPTIONS (0.9%) CONSUMER DISCRETIONARY (0.3%) 2,250 Comcast Corp.# Call, 01/17/09, Strike $42.50 2,058,750 600 Garmin, Ltd.# Call, 01/19/08, Strike $50.00 447,000 1,450 Harley-Davidson, Inc.# Call, 01/17/09, Strike $70.00 1,522,500 Nike, Inc.# 560 Call, 01/17/09, Strike $100.00 742,000 560 Call, 01/17/09, Strike $90.00 1,066,800 760 Office Depot, Inc.# Call, 01/19/08, Strike $40.00 277,400 1,100 Omnicom Group, Inc.# Call, 01/17/09, Strike $100.00 1,991,000 --------------- 8,105,450 --------------- CONSUMER STAPLES (0.1%) 1,300 Kroger Company# Call, 01/19/08, Strike $22.50 598,000 635 PepsiCo, Inc.# Call, 01/19/08, Strike $60.00 520,700 --------------- 1,118,700 --------------- ENERGY (0.0%) 315 BJ Services Company# Call, 01/19/08, Strike $40.00 22,050 500 Nabors Industries, Ltd.# Call, 01/19/08, Strike $37.50 77,500 215 Petroleo Brasileiro, SA# Call, 01/19/08, Strike $90.00 371,950 360 Schlumberger, Ltd.# Call, 01/19/08, Strike $65.00 284,400 330 Weatherford International, Ltd.# Call, 01/19/08, Strike $55.00 44,550 --------------- 800,450 --------------- FINANCIALS (0.2%) 1,150 Charles Schwab Corp.# Call, 01/19/08, Strike $17.50 350,750 55 Chicago Mercantile Exchange Holdings, Inc.# Call, 01/19/08, Strike $510.00 559,075 650 E*TRADE Financial Corp.# Call, 01/19/08, Strike $25.00 208,000 Goldman Sachs Group, Inc.# 265 Call, 01/17/09, Strike $195.00 1,283,925 175 Call, 01/19/08, Strike $190.00 684,250 360 Lehman Brothers Holdings, Inc.# Call, 01/19/08, Strike $75.00 520,200 NUMBER OF CONTRACTS VALUE ------------ --------------- 380 Merrill Lynch & Company, Inc.# Call, 01/19/08, Strike $85.00 $ 564,300 --------------- 4,170,500 --------------- HEALTH CARE (0.0%) 215 Allergan, Inc.# Call, 01/19/08, Strike $110.00 374,100 --------------- INDUSTRIALS (0.1%) 1,400 General Dynamics Corp.# Call, 01/17/09, Strike $75.00 1,911,000 --------------- INFORMATION TECHNOLOGY (0.2%) 2,100 Apple Computer, Inc.# Call, 01/19/08, Strike $90.00 2,667,000 820 Hewlett-Packard Company# Call, 01/19/08, Strike $40.00 582,200 750 Intuit, Inc.# Call, 01/19/08, Strike $35.00 181,875 800 Motorola, Inc.# Call, 01/19/08, Strike $22.50 110,000 580 NVIDIA Corp.# Call, 01/19/08, Strike $40.00 142,100 230 Sandisk Corp.# Call, 01/19/08, Strike $65.00 32,775 --------------- 3,715,950 --------------- MATERIALS (0.0%) 320 Alcan, Inc.# Call, 01/19/08, Strike $55.00 153,600 849 Harmony Gold Mining Company, Ltd.# Call, 01/19/08, Strike $15.00 152,820 230 United States Steel Corp.# Call, 01/19/08, Strike $70.00 456,550 --------------- 762,970 --------------- TELECOMMUNICATION SERVICES (0.0%) 500 America Movil, S.A. de CV# Call, 01/19/08, Strike $40.00 450,000 350 NII Holdings, Inc.# Call, 01/19/08, Strike $70.00 474,250 --------------- 924,250 --------------- TOTAL OPTIONS 21,883,370 --------------- TOTAL SYNTHETIC CONVERTIBLE SECURITIES (Cost $146,353,890) 145,893,559 --------------- NUMBER OF SHARES VALUE ------------ --------------- CONVERTIBLE PREFERRED STOCKS (17.4%) CONSUMER DISCRETIONARY (3.9%) 2,652,400 Ford Motor Company Capital Trust II 6.500% 97,793,988 --------------- ENERGY (1.1%) 110,000 Chesapeake Energy Corp. 6.250% 28,058,250 --------------- See accompanying notes to Schedule of Investments 6 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) NUMBER OF SHARES VALUE ------------ --------------- FINANCIALS (10.5%) 850,000 Citigroup, Inc. (Genworth Financial, Inc.)++& 5.020% $ 27,965,000 27,600 Fortis Insurance, N.V. (Assurant, Inc.)*& 7.750% 39,139,560 650,000 Genworth Financial, Inc. 6.000% 24,238,500 725,000 Lazard, Ltd. 6.625% 31,617,250 1,950,000 Lehman Brothers Holdings, Inc. (General Mills, Inc.)& 6.250% 53,371,500 460,000 Merrill Lynch & Co., Inc. (Nuveen Investments, Inc.)& 6.750% 20,470,000 1,400,000 Metlife, Inc. 6.375% 43,988,000 470,000 National Australia Bank, Ltd. 7.875% 24,064,000 --------------- 264,853,810 --------------- HEALTH CARE (1.5%) 639,000 Schering-Plough Corp. 6.000% 37,637,100 --------------- UTILITIES (0.4%) 200,000 Southern Union Company 5.000% 10,593,000 --------------- TOTAL CONVERTIBLE PREFERRED STOCKS (Cost $405,558,997) 438,936,148 --------------- COMMON STOCKS (66.0%) CONSUMER DISCRETIONARY (5.0%) 400,000 Carnival Corp. 20,624,000 300,000 CBS Corp. 9,351,000 340,000 SEK Hennes & Mauritz AB 18,394,377 550,000 Home Depot, Inc. < 22,407,000 51,950 Idearc, Inc. < # 1,684,219 375,000 Mattel, Inc. 9,135,000 375,000 Tupperware Corp. < 8,748,750 450,000 V.F. Corp. < 34,141,500 --------------- 124,485,846 --------------- CONSUMER STAPLES (8.9%) 320,000 Altria Group, Inc. < 27,964,800 350,000 Anheuser-Busch Companies, Inc. 17,839,500 1,300,000 Coca-Cola Company < 62,244,000 425,000 H. J. Heinz Company < 20,026,000 250,000 Kraft Foods, Inc. < 8,730,000 410,000 Procter & Gamble Company 26,596,700 840,000 Reynolds American, Inc. < 54,180,000 156,200 Universal Corp. 7,549,146 --------------- 225,130,146 --------------- ENERGY (6.0%) 775,000 Chevron Corp. < 56,482,000 550,000 ConocoPhillips 36,525,500 250,000 Marathon Oil Corp. 22,585,000 NUMBER OF SHARES VALUE ------------ --------------- 295,000 PetroChina Company, Ltd. < $ 36,382,350 --------------- 151,974,850 --------------- FINANCIALS (13.1%) 500,000 Bank of America Corp. < 26,290,000 1,372,000 Citigroup, Inc. 75,638,360 250,000 Federal Home Loan Mortgage Corp. < 16,232,500 777,000 Federal National Mortgage Association 43,923,810 600,000 J.P. Morgan Chase & Company 30,558,000 158,074 Lincoln National Corp. 10,613,088 500,000 U.S. Bancorp < 17,800,000 360,000 Wachovia Corp. < 20,340,000 2,000,000 Washington Mutual, Inc. 89,180,000 --------------- 330,575,758 --------------- HEALTH CARE (12.6%) 525,000 Abbott Laboratories 27,825,000 300,000 Eli Lilly and Company 16,236,000 1,600,000 Johnson & Johnson 106,880,000 1,755,000 Merck & Company, Inc. 78,536,250 3,300,000 Pfizer, Inc. 86,592,000 --------------- 316,069,250 --------------- INDUSTRIALS (4.1%) 1,175,000 General Electric Company 42,358,750 450,000 Masco Corp. < 14,395,500 350,000 R.R. Donnelley & Sons Company < 12,985,000 435,000 Raytheon Company 22,576,500 375,000 Tyco International, Ltd. < 11,955,000 --------------- 104,270,750 --------------- INFORMATION TECHNOLOGY (7.4%) 450,000 Cisco Systems, Inc.# 11,965,500 615,000 Electronic Data Systems Corp. < 16,180,650 850,000 Hewlett-Packard Company < 36,788,000 570,000 Infosys Technologies, Ltd. < 33,060,000 1,382,000 Intel Corp. 28,966,720 1,225,000 Microsoft Corp. 37,803,500 500,000 Nokia Corp.# 11,050,000 600,000 Oracle Corp.# 10,296,000 --------------- 186,110,370 --------------- TELECOMMUNICATION SERVICES (8.9%) 4,044,875 AT&T, Inc. 152,208,646 823,500 CAD BCE Inc. 21,651,164 1,500,000 GBP BT Group, PLC# 9,067,600 1,039,000 Verizon Communications, Inc. 40,022,280 --------------- 222,949,690 --------------- TOTAL COMMON STOCKS (Cost $1,436,575,886) 1,661,566,660 --------------- NUMBER OF CONTRACTS VALUE ------------ --------------- PUT OPTIONS (0.2%) FINANCIALS (0.2%) 1,930 S & P 500 Index# Put, 12/22/07, $350.00 (Cost $7,474,890) 5,259,250 --------------- See accompanying notes to Schedule of Investments 7 CALAMOS STRATEGIC TOTAL RETURN FUND SCHEDULE OF INVESTMENTS JANUARY 31, 2007 (UNAUDITED) PRINCIPAL AMOUNT VALUE ------------ --------------- SHORT-TERM INVESTMENT (0.9%) COMMERCIAL PAPER (0.9%) $ 23,850,000 Citigroup, Inc. 5.210%, 02/01/07 (Cost $23,850,000) $ 23,850,000 --------------- NUMBER OF SHARES VALUE ------------ --------------- INVESTMENTS OF CASH COLLATERAL FOR SECURITIES ON LOAN (14.3%) 360,016,000 Bank of New York Institutional Cash Reserve Fund current rate 5.384% (Cost $360,016,000) 360,016,000 --------------- TOTAL INVESTMENTS (156.6%) (Cost $3,626,850,789) 3,943,767,882 --------------- PAYABLE UPON RETURN OF SECURITIES ON LOAN (-14.3%) (360,016,000) --------------- OTHER ASSETS, LESS LIABILITIES (0.6%) 15,105,155 --------------- PREFERRED SHARES AT REDEMPTION VALUE INCLUDING DIVIDENDS PAYABLE (-42.9%) (1,081,058,120) --------------- NET ASSETS APPLICABLE TO COMMON SHAREHOLDERS (100.0%) $ 2,517,798,917 --------------- NOTES TO SCHEDULE OF INVESTMENTS Note: Value 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 January 31, 2007, the market value of 144A securities that were not subject to mandatory issuer registration obligations is $216,195,255 or 8.6% of net assets. < Security, or portion of security, is on loan. # Non-income producing security. ++ Variable rate or step bond security. The interest rate shown is the rate in effect at January 31, 2007. & Securities exchangeable or convertible into securities of an entity different than the issuer. Such entity is identified in the parenthetical. FOREIGN CURRENCY ABBREVIATIONS CAD Canadian Dollar EUR European Monetary Unit GBP British Pound Sterling SEK Swedish Krona See accompanying notes to Schedule of Investments 8 NOTES TO SCHEDULE OF INVESTMENTS (unaudited) NOTE 1 - ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES ORGANIZATION. CALAMOS Strategic Total Return Fund (the "Fund") was organized as a Delaware statutory trust on December 31, 2003 and is registered under the Investment Company Act of 1940 (the "1940 Act") as a diversified, closed-end management investment company. The Fund commenced operations on March 26, 2004. 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 primarily in common and preferred stocks and income producing securities such as investment grade and below investment grade debt securities. PORTFOLIO VALUATION. The valuation of the Fund's portfolio securities is in accordance with policies and procedures adopted by and under the ultimate supervision of the Board of Trustees. Portfolio securities that are traded on U.S. securities exchanges, except option securities, are valued at the last current reported sales price at the time as of which the Fund determines its NAV. Securities traded in the over-the-counter ("OTC") market and quoted on The Nasdaq Stock Market are valued at the Nasdaq Official Closing Price ("NOCP"), as determined by Nasdaq, or lacking a NOCP, the last current reported sale price on Nasdaq at the time as of which the Fund determines its NAV. When a most recent last sale or closing price is not available, portfolio securities, other than option securities, that are traded on a U.S. securities exchange and other securities traded in the OTC market are valued at the mean between the most recent bid and asked quotations in accordance with guidelines adopted by the Board of Trustees. Each option security traded on a U.S. securities exchange is valued at the mid-point of the consolidated bid/ask quote for the option security, also in accordance with guidelines adopted by the Board of Trustees. Each OTC option that is not traded through the Options Clearing Corporation is valued by the counterparty to such option. If the pricing committee determines that the valuation of a security in accordance with the methods described above is not reflective of a fair value for such security, the security, including any thinly-traded security, junk bond or synthetic convertible instrument, is valued at a fair value by the pricing committee, under the ultimate supervision of the Board of Trustees, following the guidelines and/or procedures adopted by the Board of Trustees. Trading in securities on European and Far Eastern securities exchanges and OTC markets is typically completed at various times before the close of business on each day on which the NYSE is open. Each security trading on these exchanges or OTC markets is evaluated utilizing a systematic fair valuation model provided by an independent pricing service approved by the Board of Trustees. The valuation of each security that meets certain criteria in relation to the valuation model is systematically adjusted to reflect the impact of movement in the U.S. market after the foreign markets close. Securities that do not meet the criteria, or that are principally traded in other foreign markets, are valued as of the last current sale price at the time as of which the Fund determines its NAV, or when reliable market prices or quotations are not readily available, at the mean between the most recent bid and asked quotations as of the close of the appropriate exchange or other designated time, in accordance with guidelines adopted by the Board of Trustees. Trading of foreign 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 NAV is not calculated. As stated above, if the market prices are not readily available or are not reflective of a security's fair value, the security is valued at a fair value by the pricing committee, under the ultimate supervision of the Board of Trustees, following the guidelines and/or procedures adopted by the Board of Trustees. 9 NOTES TO SCHEDULE OF INVESTMENTS (unaudited) The Fund also may use fair value pricing, pursuant to Board of Trustees guidelines and under the ultimate supervision of the Board of Trustees if the value of a foreign security it holds is materially affected by events occurring before their pricing time but after the close of the primary market or exchange on which the security is traded. Those 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 of securities is employed, the prices of securities used by the Fund to calculate its NAV may differ from market quotations or official closing prices. INVESTMENT TRANSACTIONS. Short-term and long-term investment transactions are recorded on a trade date basis on January 31, 2007. FOREIGN CURRENCY TRANSLATION. Values of investments and other assets and liabilities denominated in foreign currencies are translated into U.S. dollars using a rate quoted by a major bank or dealer in the particular currency market, as reported by a recognized quotation dissemination service. 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 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 purchased call options is increased by premiums paid. The proceeds from securities sold through the exercise of purchased 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 written options. 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. NOTE 2 - INVESTMENTS The following information is presented on a Federal income tax basis as of January 31, 2007. Differences between the cost basis under U.S. generally accepted accounting principles and Federal income tax purposes are primarily due to timing differences. Cost basis of investments $3,638,504,145 -------------- Gross unrealized appreciation 371,315,196 Gross unrealized depreciation (66,051,459) -------------- Net unrealized appreciation (depreciation) $ 305,263,737 -------------- 10 NOTES TO SCHEDULE OF INVESTMENTS (unaudited) NOTE 3 - FORWARD FOREIGN CURRENCY CONTRACTS There were no open forward foreign currency contracts at January 31, 2007. NOTE 4 - 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", which may be a convertible or non-convertible security) and the right to acquire equity securities ("convertible component"). The fixed-income component is achieved by investing in 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 convertible instruments 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. NOTE 5 - PREFERRED SHARES There are unlimited shares of Auction Rate Cumulative Preferred Shares ("Preferred Shares") authorized. The Preferred Shares have rights as determined by the Board of Trustees. The 43,200 shares of Preferred Shares outstanding consist of seven series, 7,040 shares of M, 7,040 shares of TU, 7,040 shares of W, 7,040 shares of TH, 7,040 shares of F, 4,000 shares of A, and 4,000 shares of B. The Preferred Shares have a liquidation value of $25,000 per share plus any accumulated but unpaid dividends, whether or not declared. NOTE 6 - INTEREST RATE TRANSACTIONS Swap agreements are stated at fair value. The contracts are marked-to-market daily based on dealer-supplied valuations and changes in value are recorded as unrealized appreciation (depreciation). Details of the interest rate swap agreements outstanding as of January 31, 2007 were as follows: Unrealized Termination Notional Fixed Rate Floating Rate Appreciation Counterparty Date Amount (000) (Fund Pays) (Fund Receives) (Depreciation) ------------ ------------ ------------ ----------- --------------- -------------- Citibank NA June 4, 2007 150,000 3.61% 1month LIBOR 1,066,651 Citibank NA June 4, 2009 200,000 4.34% 1month LIBOR 3,730,576 ---------- $4,797,227 ========== 11 NOTES TO SCHEDULE OF INVESTMENTS (unaudited) NOTE 7 - SECURITIES LENDING For the three-month period ended January 31, 2007, the Fund loaned 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, the Fund's securities lending agent monitors, and reports to Calamos Advisors on, the creditworthiness of the firms to which a Fund lends securities. At January 31, 2007, the Fund had securities valued at $349,735,117 that were on loan to broker-dealers and banks and $360,016,000 in cash or cash equivalent collateral. 12 ITEM 2. 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-Q 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 registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 3. EXHIBITS. (a) Certification of Principal Executive Officer. (b) 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 Strategic Total Return Fund By: /s/ John P. Calamos, Sr. --------------------------------- Name: John P. Calamos, Sr. Title: Principal Executive Officer Date: March 28, 2007 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 Strategic Total Return Fund By: /s/ John P. Calamos, Sr. --------------------------------- Name: John P. Calamos, Sr. Title: Principal Executive Officer Date: March 28, 2007 By: /s/ Patrick H. Dudasik --------------------------------- Name: Patrick H. Dudasik Title: Principal Financial Officer Date: March 28, 2007