13F-HR 1 d517397d13fhr.txt 13F-HR ================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 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: DIAMONDBACK CAPITAL MANAGEMENT Address: ONE LANDMARK SQUARE STAMFORD, CT 06901 13 File Number: 28-11513 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 form Person Signing this Report on Behalf of Reporting Manager: Name: Timothy M. Higgins Title: Chief Financial Officer Phone: 203 399 1600 Signature, Place and Date of Signing: Timothy M. Higgins Stamford, CT April 24, 2013 __________________ ____________ ____________ [Signature] [City, State] [Date] As of March 31, 2013, Diamondback Capital Management, LLC ("Diamondback"), no longer exercises investment discretion over any Section 13(f) securities. Moreover, as previously communicated to investors, Diamondback is currently conducting an orderly wind-down and termination of the funds under Diamondback's management. Accordingly, this will be Diamondback's final 13F filing. Report Type (Check only one.): [X] 13F HOLDINGS REPORT. [_] 13F NOTICE. [_] 13F COMBINATION REPORT. I AM SIGNING THIS REPORT AS REQUIRED BY THE SECURITIES EXCHANGE ACT OF 1934 ================================================================================ FORM 13F SUMMARY PAGE Report Summary: Number of Other Included Managers: 0 Form 13F Information Table Entry Total: 0 Form 13F Information Table Value Total: 0

~~VALUE~~Sh SH / ~~PUT~~Put / ~~INVESTMENT~~Investment ~~OTHER~~Other ~~NAME~~Name OFof ~~ISSUER~~Issuer ~~TITLE~~Title OFof ~~CLASS~~Class CUSIP Value (x1000) ~~QUANTITY~~Quantity ~~PRN~~Prn ~~CALL~~Call ~~DISCRETION~~Discretion ~~MANAGERS~~Managers ~~SOLE SHARED NONE SANCHEZ ENERGY CORP COM 79970Y905 3600 200000 SH CALL~~ Sole ~~200000~~Shared ~~AFFYMETRIX~~None ~~INC~~-------------- ~~COM~~-------------- ~~00826T908~~----- ~~951~~------------- ~~300000~~-------- SH---- ~~CALL~~----- ~~Sole~~---------- ~~300000~~-------- ~~CALLIDUS~~---- ~~SOFTWARE~~------ INC COM G01767905 2043 450000 SH CALL Sole 450000 HUTCHINSON TECHNOLOGY INC NOTE 8.500% 1/1 448407AG1 8368 14263000 PRN Sole 14263000 SCHOOL SPECIALTY INC SDCV 3.750%11/3 807863AM7 2273 4500000 PRN Sole 4500000 MCMORAN EXPLORATION CO NOTE 4.000%12/3 582411AJ3 6190 5450000 PRN Sole 5450000 EVEREST RE GROUP LTD COM G3223R108 31303 284700 SH Sole 284700 YAHOO INC COM 984332106 29850 1500000 SH Sole 1500000 KONGZHONG CORP SPONSORED ADR 50047P104 6982 1273505 SH Sole 1273505 GREENLIGHT CAPITAL RE LTD CLASS A G4095J109 2597 112500 SH Sole 112500----

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