13F-HR 1 a2198766z13f-hr.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, 2010 ----------------------- 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: Loch Capital Management LLC ------------------------------------ Address: 30 Federal Street, Boston, MA 02110 ------------------------------------ Form 13F File Number: 28-11100 --------------------- 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: David Matthews ------------------------------- Title: Chief Financial Officer ------------------------------- Phone: 617-289-7604 ------------------------------- Signature, Place, and Date of Signing: /s/ David Matthews Boston, MA May 13, 2010 ------------------------------- ----------------- ------------ [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).) 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: 40 -------------------- Form 13F Information Table Value Total: 327,173 -------------------- (thousands) FORM 13F INFORMATION TABLE

COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8 Value Shares/ Sh/ Put/ Invstmt Other Voting Authority NAME OF ISSUER TITLE OF CLASS CUSIP (x1000) Prn amt Prn Call Discretn Mangers Sole Shared None ~~Accenture~~Acme ~~Ltd.~~Packet Common Stock ~~G1151C101~~004764106 3,~~896~~352.8541 93173,~~900~~880. Sh Sole 93173,~~900~~880. 0 0 ~~Airvana~~Activision Inc. Common Stock ~~00950V101~~00507V109 ~~160~~6,360.3673 21525,100. Sh Sole 21525,100. 0 0 ~~American~~Adobe ~~Tower~~Systems ~~Corp.~~Incorporated Common Stock ~~029912201~~00724F101 362,~~218~~716.6242 ~~838~~76,~~200~~800. Sh Sole ~~838~~76,~~200~~800. 0 0 ~~Apple~~Adtran ~~Computer~~ Inc. Common Stock ~~037833100~~00738A106 281,~~174~~981.8752 ~~133~~75,~~700~~200. Sh Sole ~~133~~75,~~700~~200. 0 0 ~~Avago~~Agilent Technologies ~~Ltd Common Stock Y0486S104 3,323.29 181,700. Sh Sole 181,700. 0 0 Bmc Software~~ Inc. Common Stock ~~055921100~~00846U101 57,~~437~~173.5675 ~~135~~208,600. Sh Sole ~~135~~208,600. 0 0 ~~Brocade~~American ~~Communications~~Tower ~~Systems Inc~~Corp. Common Stock ~~111621306~~029912201 36,~~729~~817.5460 ~~488~~160,~~800~~000. Sh Sole ~~488~~160,~~800~~000. 0 0 ~~Ciena~~Analog ~~Corp.~~Devices Inc Common Stock ~~171779309~~032654105 125,~~253~~372.5405 1186,~~130,~~400. Sh Sole 1186,~~130,~~400. 0 0 ~~Cisco~~Apple ~~Systems~~Computer Inc. Common Stock ~~17275R102~~037833100 2923,~~819~~194.6650 198,~~245,600~~700. Sh Sole 198,~~245,600~~700. 0 0 ~~Commscope~~Atmel ~~Inc~~Corp. Common Stock ~~203372107~~049513104 24,~~419~~452.5484 91883,~~200~~500. Sh Sole 91883,~~200~~500. 0 0 ~~Crown~~Bmc ~~Castle~~Software ~~International Corp~~Inc. Common Stock ~~228227104~~055921100 97,~~252~~638.4800 ~~237~~201,000. Sh Sole ~~237~~201,000. 0 0 ~~Dish~~Brocade ~~Network~~Communications ~~Corp~~Systems Inc. Common Stock ~~25470M109~~111621306 106,~~054~~943.7693 ~~484~~1,216,100. Sh Sole ~~484,100. 0 0 Dragonwave Inc Common Stock 26144M103~~ 1,~~833.60 160~~216,~~000~~100. ~~Sh Sole 160,000.~~ 0 0 ~~Emulex~~Cablevision Systems Corporation Common Stock ~~292475209~~12686C109 54,~~339~~574.9153 ~~489~~189,~~900~~500. Sh Sole ~~489~~189,~~900~~500. 0 0 ~~Google~~Ciena ~~Inc~~Corp. Common Stock ~~38259P508~~171779309 2316,~~869~~563.2320 381,~~500~~085,400. Sh Sole 381,~~500. 0 0 Ja Solar Holding Co. Ltd. ADRS 466090107 65.55 11~~085,~~500~~400. ~~Sh Sole 11,500.~~ 0 0 ~~JDS~~Cisco ~~Uniphase~~Systems ~~Corp~~Inc. Common Stock ~~46612J507~~17275R102 ~~102~~19,436.3060 12746,~~400~~700. Sh Sole 12746,~~400~~700. 0 0 ~~Kla-Tencor~~Comcast ~~Corp.~~Corporation Common Stock ~~482480100~~20030N101 78,~~937~~735.9224 ~~219~~463,~~522~~900. Sh Sole ~~219~~463,~~522~~900. 0 0 ~~Lam~~Corning ~~Research Corp~~Inc. Common Stock ~~512807108~~219350105 278,~~270~~100.5617 ~~695~~400,~~500~~800. Sh Sole ~~695~~400,~~500~~800. 0 0 ~~Leap~~Crown ~~Wireless~~Castle International ~~Inc~~Corp. Common Stock ~~521863308~~228227104 612,~~325~~669.0242 ~~360~~331,400. Sh Sole ~~360~~331,400. 0 0 ~~Linear~~Google ~~Technology Corp~~Inc. Common Stock ~~535678106~~38259P508 1120,~~215~~203.5265 ~~367~~35,~~000~~625. Sh Sole ~~367~~35,~~000~~625. 0 0 ~~Mattson~~Hewlett-Packard ~~Technology~~Company ~~Inc~~ Common Stock ~~577223100~~428236103 ~~113~~12,973.1794 31243,~~700~~800. Sh Sole 31243,~~700~~800. 0 0 ~~Maxim~~Intel ~~Integrated~~Corporation ~~Products Inc.~~ Common Stock ~~57772K101~~458140100 22,~~536~~731.5134 1,~~109~~019,~~080~~800. Sh Sole 1,~~109~~019,~~080~~800. 0 0 ~~Metropcs~~JDS ~~Communications~~Uniphase ~~Inc~~Corp. Common Stock ~~591708102~~46612J507 73,~~774~~578.2122 1285,~~018,900~~800. Sh Sole 1285,~~018,900~~800. 0 0 ~~Micrel~~Linear ~~Inc.~~Technology ~~Common Stock 594793101 135~~Corp.30 ~~16,500. Sh Sole 16,500. 0 0 Microsoft Corp~~ Common Stock ~~594918104~~535678106 725,~~755~~813.7685 2205,~~387,000~~800. Sh Sole 2205,~~387,000~~800. 0 0 ~~Netapp~~Maxim Integrated Products Inc. Common Stock ~~64110D104~~57772K101 1511,~~919~~645.0925 ~~463~~600,~~303~~580. Sh Sole ~~463~~600,~~303~~580. 0 0 ~~News~~Mcafee ~~Corporation~~Inc. Common Stock ~~65248E104~~579064106 131,~~110~~272.9112 ~~957~~31,700. Sh Sole ~~957~~31,700. 0 0 ~~Novell~~Metropcs Communications Inc. Common Stock ~~670006105~~591708102 ~~168~~4,975.9112 40702,700. Sh Sole 40702,700. 0 0 ~~Nvidia~~Microsoft Corp. Common Stock ~~67066G104~~594918104 2120,~~798~~791.2920 1709,~~166,932~~900. Sh Sole 1709,~~166,932~~900. 0 0 ~~Oclaro~~Motorola Inc. Common Stock ~~67555N107~~620076109 484,569.3627 32650,~~900~~893. Sh Sole 32650,~~900~~893. 0 0 onNetapp ~~Semiconductor Corp~~Inc. Common Stock ~~682189105~~64110D104 ~~181~~6,963.6956 20214,~~600~~000. Sh Sole 20214,~~600~~000. 0 0 ~~Oracle~~News Corporation Common Stock ~~68389X105~~65248E104 1612,~~121~~228.1241 ~~657~~837,200. Sh Sole ~~657~~837,200. 0 0 ~~Palm~~Oracle ~~Inc.~~Corporation Common Stock ~~696643105~~68389X105 68,~~735~~677.1513 ~~671~~337,500. Sh Sole ~~671~~337,500. 0 0 Qlogic Corporation Common Stock 747277101 51,~~961~~902.0311 ~~315~~93,~~900~~700. Sh Sole ~~315~~93,~~900~~700. 0 0 ~~Qualcomm~~Sap ~~Incorporated~~Ag ~~Common~~ADRS ~~Stock~~803054204 ~~747525103 31~~9,~~590~~658.9509 ~~682~~200,~~900~~500. Sh Sole ~~682~~200,~~900~~500. 0 0 ~~Qwest~~Sandisk ~~Communications~~Corporation ~~International Inc.~~ Common Stock ~~749121109~~80004C101 ~~1,921.44 456,400. Sh Sole 456,400. 0 0 Riverbed Technology Inc. Common Stock 768573107~~ 4,~~819~~602.1133 ~~209~~132,~~800~~900. Sh Sole ~~209~~132,~~800~~900. 0 0 ~~Semitool Inc Common Stock 816909105 136.40 12,400. Sh Sole 12,400. 0 0~~ Teradyne Inc. Common Stock 880770102 ~~148~~6,012.0781 13538,~~800~~300. Sh Sole 13538,~~800~~300. 0 0 The Directv Group Inc. Common Stock 25490A101 272,~~403~~474.7089 ~~821~~73,~~700~~200. Sh Sole ~~821~~73,~~700~~200. 0 0 ~~Time~~The ~~Warner~~Walt ~~Cable~~Disney ~~Inc~~Company Common Stock ~~88732J207~~254687106 51,~~662~~567.1546 ~~136~~44,~~800~~900. Sh Sole ~~136~~44,~~800~~900. 0 0 Verigy Ltd. Common Stock Y93691106 ~~178~~1,457.7587 13130,~~900~~400. Sh Sole 13130,~~900~~400. 0 0 ~~Virage~~Viacom ~~Logic~~Inc. ~~Corporation~~ Common Stock ~~92763R104~~92553P201 ~~1071~~8,168.8469 ~~194~~237,~~880~~600. Sh Sole ~~194~~237,~~880~~600. 0 0 ~~Xilinx~~Virage ~~Inc.~~Logic Corporation Common Stock ~~983919101~~92763R104 ~~19003~~1,297.0053 ~~758~~165,~~300~~080. Sh Sole ~~758~~165,~~300~~080. 0 0 ~~Yahoo!~~Virgin Media Inc. Common Stock ~~984332106~~92769L101 ~~15976~~7,525.7636 ~~952~~436,~~131~~000. Sh Sole ~~952~~436,~~131~~000. 0 0

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