UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 13F Form 13F COVER PAGE Report for the Calendar Year or Quarter Ended: 3/31/2013 Check here if Amendment []; Amendment Number: ------- This Amendment (Check only one.): [] is a restatement. [] adds new holdings entries. Institutional Investment Manager Filing this Report: Name: Chesapeake Partners Management Co., Inc. Address: 2800 Quarry Lake Drive Suite 300 Baltimore, Maryland 21209 Form 13F File Number: 28-04120 The institutional investment manager filing this report and the person by whom it is signed hereby represent that the person signing the report is authorized to submit it, that all information contained herein is true, correct and complete, and that it is understood that all required items, statements, schedules, lists, and tables, are considered integral parts of this submission. Persons Signing this Report on Behalf of Reporting Manager: Name: Mark D. Lerner Title: Vice President Phone: 410-602-0195 Signature, Place, and Date of Signing: /s/ Mark D. Lerner Baltimore, Maryland 5/15/2013 --------------------------------- --------------------------------- ---------- [Signature] [City, State] [Date] Report Type (Check only one): [X] 13F HOLDINGS REPORT. (Check here if all holdings of this reporting manager are reported in this report.) [ ] 13F NOTICE. (Check here if no holdings reported are in this report, and all holdings are reported by other reporting manager(s).) [ ] 13F COMBINATION REPORT. (Check here if a portion of the holdings for this reporting manager are reported in this report and a portion are reported by other reporting manager(s).) List of Other Managers Reporting for this Manager: Form 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 1 Form 13F Information Table Entry Total: 83 Form 13F Information Table Value Total: $ 1,335,600 -------------- (In Thousands) List of Other Included Managers: Provide a numbered list of the name(s) and 13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. No. Form 13F File Number Name 1 028-14848 C P Management, L.L.C. ---- -------------------- ---------------------------------------------------- FORM 13F INFORMATION TABLE COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ---------------------------- ---------------- --------- -------- ------------------- ---------- -------- ---------------------- VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE ---------------------------- ---------------- --------- -------- ---------- --- ---- ---------- -------- ---------- ------ ---- ALTERRA CAPITAL HOLDINGS LIM COM G0229R108 2,379 75,539 SH DEFINED 1 75,539 0 0 AMERICAN INTL GROUP INC COM NEW 026874784 14,777 380,646 SH DEFINED 1 380,646 0 0 AMERICAN RLTY CAP PPTYS INC COM 02917T104 2,675 182,363 SH DEFINED 1 182,363 0 0 APPLE INC COM 037833100 50,900 114,987 SH DEFINED 1 114,987 0 0 BANK OF AMERICA CORPORATION COM 060505104 10,045 824,700 SH DEFINED 1 824,700 0 0 BARNES & NOBLE INC COM 067774109 4,663 283,485 SH DEFINED 1 283,485 0 0 BARNES & NOBLE INC COM 067774109 8,225 500,000 SH CALL DEFINED 1 500,000 0 0 BED BATH & BEYOND INC COM 075896100 19,770 306,897 SH DEFINED 1 306,897 0 0 BERRY PETE CO CL A 085789105 1,359 29,360 SH DEFINED 1 29,360 0 0 CAPITAL ONE FINL CORP COM 14040H105 31,017 564,459 SH DEFINED 1 564,459 0 0 CAPITAL ONE FINL CORP COM 14040H105 27,475 500,000 SH CALL DEFINED 1 500,000 0 0 CHENIERE ENERGY INC COM NEW 16411R208 33,808 1,207,436 SH DEFINED 1 1,207,436 0 0 CITIGROUP INC COM NEW 172967424 52,840 1,194,386 SH DEFINED 1 1,194,386 0 0 CLEARWIRE CORP NEW CL A 18538Q105 93,661 28,907,625 SH DEFINED 1 28,907,625 0 0 COACH INC COM 189754104 1,465 29,307 SH DEFINED 1 29,307 0 0 COMMONWEALTH REIT COM SH BEN INT 203233101 5,627 250,750 SH DEFINED 1 250,750 0 0 CONSTELLATION BRANDS INC CL A 21036P108 11,910 250,000 SH CALL DEFINED 1 250,000 0 0 COPANO ENERGY L L C COM UNITS 217202100 2,026 50,000 SH DEFINED 1 50,000 0 0 CORRECTIONS CORP AMER NEW COM NEW 22025Y407 6,255 160,093 SH DEFINED 1 160,093 0 0 COVENTRY HEALTH CARE INC COM 222862104 4,636 98,579 SH DEFINED 1 98,579 0 0 CYMER INC COM 232572107 16,836 175,100 SH DEFINED 1 175,100 0 0 DIGITALGLOBE INC COM NEW 25389M877 9,605 332,250 SH DEFINED 1 332,250 0 0 DST SYS INC DEL COM 233326107 33,811 474,410 SH DEFINED 1 474,410 0 0 E TRADE FINANCIAL CORP COM NEW 269246401 6,454 602,604 SH DEFINED 1 602,604 0 0 ENDO HEALTH SOLUTIONS INC COM 29264F205 14,001 455,154 SH DEFINED 1 455,154 0 0 EXPRESS SCRIPTS HLDG CO COM 30219G108 14,949 259,435 SH DEFINED 1 259,435 0 0 FACEBOOK INC CL A 30303M102 4,986 194,922 SH DEFINED 1 194,922 0 0 FERRO CORP COM 315405100 6,683 990,100 SH DEFINED 1 990,100 0 0 FORD MTR CO DEL COM PAR $0.01 345370860 30,622 2,328,701 SH DEFINED 1 2,328,701 0 0 FOREST CITY ENTERPRISES INC CL A 345550107 3,690 207,677 SH DEFINED 1 207,677 0 0 FREEPORT-MCMORAN COPPER & GO COM 35671D857 13,283 401,300 SH DEFINED 1 401,300 0 0 GARDNER DENVER INC COM 365558105 7,511 100,000 SH DEFINED 1 100,000 0 0 GEO GROUP INC COM 36159R103 6,840 181,822 SH DEFINED 1 181,822 0 0 HARRY WINSTON DIAMOND CORP COM 41587B100 13,320 815,705 SH DEFINED 1 815,705 0 0 HERTZ GLOBAL HOLDINGS INC COM 42805T105 81,685 3,669,603 SH DEFINED 1 3,669,603 0 0 HESS CORP COM 42809H107 10,354 144,595 SH DEFINED 1 144,595 0 0 HILLSHIRE BRANDS CO COM 432589109 6,219 176,919 SH DEFINED 1 176,919 0 0 JPMORGAN CHASE & CO COM 46625H100 42,219 889,574 SH DEFINED 1 889,574 0 0 KINDER MORGAN INC DEL *W EXP 05/25/201 49456B119 1,732 336,944 SH DEFINED 1 336,944 0 0 KRAFT FOODS GROUP INC COM 50076Q106 4,408 85,536 SH DEFINED 1 85,536 0 0 LAS VEGAS SANDS CORP COM 517834107 28,733 509,895 SH DEFINED 1 509,895 0 0 LEAR CORP COM NEW 521865204 51,058 930,523 SH DEFINED 1 930,523 0 0 MASCO CORP COM 574599106 1,418 70,000 SH DEFINED 1 70,000 0 0 METROPCS COMMUNICATIONS INC COM 591708102 11,345 1,040,861 SH DEFINED 1 1,040,861 0 0 MGM RESORTS INTERNATIONAL COM 552953101 22,604 1,718,935 SH DEFINED 1 1,718,935 0 0 MGM RESORTS INTERNATIONAL NOTE 4.250% 4/1 55303QAE0 553 500,000 PRN DEFINED 1 0 0 NONE MONDELEZ INTL INC CL A 609207105 16,266 531,310 SH DEFINED 1 531,310 0 0 MOSAIC CO NEW COM 61945C103 26,751 448,765 SH DEFINED 1 448,765 0 0 NEW YORK TIMES CO CL A 650111107 3,407 347,695 SH DEFINED 1 347,695 0 0 NYSE EURONEXT COM 629491101 4,853 125,583 SH DEFINED 1 125,583 0 0 OCH ZIFF CAP MGMT GROUP CL A 67551U105 6,209 664,104 SH DEFINED 1 664,104 0 0 OFFICE DEPOT INC COM 676220106 4,968 1,264,177 SH DEFINED 1 1,264,177 0 0 ON ASSIGNMENT INC COM 682159108 11,735 463,653 SH DEFINED 1 463,653 0 0 ORACLE CORP COM 68389X105 8,083 250,000 SH DEFINED 1 250,000 0 0 ORACLE CORP COM 68389X105 12,932 400,000 SH CALL DEFINED 1 400,000 0 0 ORIENT-EXPRESS HOTELS LTD CL A G67743107 22,452 2,277,034 SH DEFINED 1 2,277,034 0 0 OSHKOSH CORP COM 688239201 22,674 533,622 SH DEFINED 1 533,622 0 0 OWENS CORNING NEW COM 690742101 29,031 736,264 SH DEFINED 1 736,264 0 0 PENN NATL GAMING INC COM 707569109 10,868 199,662 SH DEFINED 1 199,662 0 0 REXNORD CORP NEW COM 76169B102 7,329 345,226 SH DEFINED 1 345,226 0 0 FORM 13F INFORMATION TABLE COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 ---------------------------- ---------------- --------- -------- ------------------- ---------- -------- ---------------------- VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGERS SOLE SHARED NONE ---------------------------- ---------------- --------- -------- ---------- --- ---- ---------- -------- ---------- ------ ---- RYMAN HOSPITALITY PPTYS INC COM 78377T107 30,948 676,460 SH DEFINED 1 676,460 0 0 SANDRIDGE ENERGY INC COM 80007P307 7,101 1,347,484 SH DEFINED 1 1,347,484 0 0 SANOFI RIGHT 12/31/2020 80105N113 399 222,800 SH DEFINED 1 222,800 0 0 SAUER-DANFOSS INC COM 804137107 7,483 128,069 SH DEFINED 1 128,069 0 0 SAVIENT PHARMACEUTICALS INC COM 80517Q100 659 823,242 SH DEFINED 1 823,242 0 0 SCHULMAN A INC COM 808194104 316 10,000 SH DEFINED 1 10,000 0 0 SCIENTIFIC GAMES CORP CL A 80874P109 2,786 318,455 SH DEFINED 1 318,455 0 0 SOTHEBYS COM 835898107 22,582 603,646 SH DEFINED 1 603,646 0 0 SPRINT NEXTEL CORP COM SER 1 852061100 1,323 213,122 SH DEFINED 1 213,122 0 0 TENNECO INC COM 880349105 23,300 592,715 SH DEFINED 1 592,715 0 0 THERAVANCE INC COM 88338T104 60,849 2,576,169 SH DEFINED 1 2,576,169 0 0 THERAVANCE INC NOTE 3.000% 1/1 88338TAA2 5,944 5,000,000 PRN DEFINED 1 5,000,000 0 NONE TOLL BROTHERS INC COM 889478103 10,957 320,000 SH DEFINED 1 320,000 0 0 TRW AUTOMOTIVE HLDGS CORP COM 87264S106 20,241 368,022 SH DEFINED 1 368,022 0 0 U S AIRWAYS GROUP INC COM 90341W108 4,113 242,373 SH DEFINED 1 242,373 0 0 U S G CORP COM NEW 903293405 14,494 548,182 SH DEFINED 1 548,182 0 0 UNITED RENTALS INC COM 911363109 20,002 363,873 SH DEFINED 1 363,873 0 0 VIACOM INC NEW CL B 92553P201 27,490 447,141 SH DEFINED 1 447,141 0 0 VIRGIN MEDIA INC COM 92769L101 24,340 497,048 SH DEFINED 1 497,048 0 0 VODAFONE GROUP PLC NEW SPONS ADR NEW 92857W209 16,060 565,500 SH DEFINED 1 565,500 0 0 VODAFONE GROUP PLC NEW SPONS ADR NEW 92857W209 4,260 150,000 SH CALL DEFINED 1 150,000 0 0 VULCAN MATLS CO COM 929160109 1,920 37,142 SH DEFINED 1 37,142 0 0 WYNN RESORTS LTD COM 983134107 10,043 80,242 SH DEFINED 1 80,242 0 0