13F-HR 1 jdn13f-q109.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM13F FORM 13F COVER PAGE Report for the Calendar Year or Quarter Ended: March 31, 2009 ----------------- 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: JDN Capital Management, LP -------------------------- Address: 2420 Camino Ramon Suite 222 -------------------------- San Ramon, CA 94583 -------------------------- -------------------------- Form 13F File Number: 28- 11131 --------------------- The institutional investment manager filing this report and 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, lists, and tables, are considered integral parts of this form. Person Signing this Report on Behalf of Reporting Manager: Name: John Nguyen ---------------------------- Title: General Partner ---------------------------- Phone: 925-244-5990 ---------------------------- Signature, Place, and Date of Signing /s/ John Nguyen San Ramon, CA April 15, 2009 --------------------- ------------------------- ----------------- [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 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 managers (s).) FORM13F SUMMARY Report Summary: Number of Other Included Managers: 0 ----------------- Form 13F Information Table Entry Total: 129 ----------------- Form 13F Information Table Value Total: 53,878 ----------------- (thousands) List of Other Included Managers: Provide a numbered list of the name(s) and Form13F file number(s) of all institutional investment managers with respect to which this report is filed, other than the manager filing this report. [If there are no entries in this list, state "NONE" and omit the column headings and list entries.] NONE

column 1 column 2 column 3 column 4 column 5 column 6 column 7 column 8 -------- -------- -------- -------- -------- ---------- -------- -------- ------------------------------------------------------------------------------------------------------------------------------------ Investment Other Voting Authority Name of Issuer Title of Cusip Value Shrs or sh/ put/ Discretion Managers Sole Shared None Class (x$1000) prn amt prn call ------------------ ------- ------- -------- ------- --- ---- ---------- -------- ---- ---- ---- ~~ACI Worldwide Inc com 004498101 333 20926 SH SOLE 20926 0 0~~ Adaptec Inc com ~~00651F10~~00651F108 ~~286~~200 ~~86662~~83462 SH SOLE ~~86662~~83462 0 0 Amicas Inc com 001712108 ~~519~~538 ~~310939~~264839 SH SOLE ~~310939~~264839 0 0 Anadigics com 032515108 ~~309~~396 ~~208600~~191100 SH SOLE ~~208600~~191100 0 0 Apple ~~Computer~~ Inc com 037833100 ~~283~~349 3320 SH SOLE 3320 0 0 Applied Matls Inc com 038222105 ~~425~~903 ~~42000~~84000 SH SOLE ~~42000~~84000 0 0 Aspen Insurance Holdings Ltd com G05384105 ~~468~~433 19300 SH SOLE 19300 0 0 Avnet Inc com 053807103 ~~1160~~1115 63700 SH SOLE 63700 0 0 Bank of America Corp com 060505104 ~~774~~361 ~~55000~~52900 SH SOLE ~~55000~~52900 0 0 Bell Microproducts Inc com 078137106 ~~133~~98 ~~221694~~209194 SH SOLE ~~221694~~209194 0 0 Best Buy Inc com 086516101 ~~323~~437 11500 SH SOLE 11500 0 0 Borland Software Corp com 099849101 ~~162~~16 ~~154646~~34646 SH SOLE ~~154646~~34646 0 0 CRM Holdings Ltd com G2554P103 ~~182~~67 ~~107333~~102933 SH SOLE ~~107333~~102933 0 0 Cadence Design Systems Inc com 127387108 ~~430~~475 ~~117393~~112993 SH SOLE ~~117393~~112993 0 0 CalAmp Corp com 128126109 8094 ~~177494~~170894 SH SOLE ~~177494~~170894 0 0 Cerion Tech com 156916108 3 10100 SH SOLE 10100 0 0 Cerner Corp com 156782104 ~~155~~177 4028 SH SOLE 4028 0 0 ~~Chemtura Corp com 163893100 174 124059 SH SOLE 124059 0 0~~ Chevron Corporation com 166764100 ~~1672~~1970 ~~22600~~29300 SH SOLE ~~22600~~29300 0 0 Cisco Sys Inc com 17275R102 ~~130~~134 8000 SH SOLE 8000 0 0 Citigroup Inc com 172967101 ~~254~~89 ~~37800~~35300 SH SOLE ~~37800~~35300 0 0 Cognex Corp com 192422103 ~~773~~697 52217 SH SOLE 52217 0 0 Comcast Corp com 20030N101 ~~771~~692 ~~45700~~50700 SH SOLE ~~45700~~50700 0 0 Commscope Inc com 203372107 ~~276~~201 17736 SH SOLE 17736 0 0 Community Health Sys Inc com 203668108 ~~435~~397 ~~29860~~25860 SH SOLE ~~29860~~25860 0 0 Conagra Foods Inc com 205887102 ~~165~~427 ~~10000~~25309 SH SOLE ~~10000~~25309 0 0 Conmed Corp com 207410101 650 45087 SH SOLE 45087 0 0 Cost Plus Inc com 221485105 6968 ~~73383~~70383 SH SOLE ~~73383~~70383 0 0 Cypress Semiconductor Corp com 232806109 ~~173~~227 ~~38600~~33600 SH SOLE ~~38600~~33600 0 0 DSP Group Inc com 23332B106 ~~848~~440 ~~105770~~101770 SH SOLE ~~105770~~101770 0 0 Dean Foods Co com 242370104 ~~987~~955 ~~54905~~52805 SH SOLE ~~54905~~52805 0 0 Delia's Inc com 246911101 ~~226~~157 ~~102792~~93792 SH SOLE ~~102792~~93792 0 0 Dell Inc com 247025109 ~~323~~287 ~~31500~~30300 SH SOLE ~~31500~~30300 0 0 Delsite Inc com 24734R103 1 10300 SH SOLE 10300 0 0 Devon Energy Corp com 25179M103 447 10000 SH SOLE 10000 0 0 Diamond Offshore Drilling Inc com 25271C102 ~~253~~270 4300 SH SOLE 4300 0 0 DreamWorks Animation SKG Inc com 26153C103 866 40000 SH SOLE 40000 0 0 E M C Corp Mass com 268648102 ~~360~~392 34400 SH SOLE 34400 0 0 EBay Inc com 278642103 ~~236~~212 16900 SH SOLE 16900 0 0 Electro Scientific Inds com 285229100 ~~312~~272 45950 SH SOLE 45950 0 0 ~~Emrise~~Emulex Corp com ~~29246J101~~292475209 28731 ~~18188~~145403 SH SOLE ~~18188~~145403 0 0 Exar Corp com 300645108 ~~844~~760 ~~126524~~121824 SH SOLE ~~126524~~121824 0 0 Federal Mogul Corp com 313549404 ~~280~~395 ~~66291~~59091 SH SOLE ~~66291~~59091 0 0 Flextronics Intl Ltd com Y2573F102 ~~429~~404 ~~167701~~139701 SH SOLE ~~167701~~139701 0 0 FormFactor Inc com 346375108 ~~477~~180 ~~32700~~10000 SH SOLE ~~32700~~10000 0 0 Freeport-McMoran Copper & Go com 35671D857 ~~330~~324 ~~13500~~8500 SH SOLE ~~13500~~8500 0 0 Future Healthcare com 360911101 0 14600 SH SOLE 14600 0 0 General Electric Co com 369604103 ~~465~~280 ~~28700~~27700 SH SOLE ~~28700~~27700 0 0 ~~Gevity HR Inc com 374393106 59 39368 SH SOLE 39368 0 0~~ Grubb & Ellis Co com 400095204 ~~177~~89 ~~142780~~141630 SH SOLE ~~142780~~141630 0 0 ~~HMS Hldgs Corp com 40425J101 394 12500 SH SOLE 12500 0 0~~ Hertz Global Holdings Inc com 42805T105 ~~157~~39 ~~31000~~10000 SH SOLE ~~31000~~10000 0 0 ~~Hot~~ICT ~~Topic~~Group Inc com ~~441339108~~44929Y101 ~~999~~282 ~~107787~~50591 SH SOLE ~~107787~~50591 0 0 ~~ICT~~Imation ~~Group~~Corp ~~Inc~~ com ~~44929Y101~~45245A107 ~~241~~288 ~~52691~~37602 SH SOLE ~~52691~~37602 0 0 Ingram Micro com 457153104 ~~922~~870 68855 SH SOLE 68855 0 0 Intel Corp com 458140100 ~~1376~~1711 ~~93850~~113850 SH SOLE ~~93850~~113850 0 0 Intersil Corp com 46069S109 ~~320~~196 ~~34800~~17000 SH SOLE ~~34800~~17000 0 0 Itron Inc com 465741106 ~~217~~161 3400 SH SOLE 3400 0 0 JDS Uniphase Corp com ~~466121J507~~46612J507 ~~420~~344 ~~115082~~105982 SH SOLE ~~115082~~105982 0 0 JP Morgan Chase & Co com 46625H100 ~~936~~1045 ~~29700~~39300 SH SOLE ~~29700~~39300 0 0 Jabil Circuit Inc com 466313103 ~~592~~469 ~~87700~~84300 SH SOLE ~~87700~~84300 0 0 Jumbo Sports com 481386100 0 20000 SH SOLE 20000 0 0 KBR Inc com 48242W106 ~~1377~~1052 ~~90600~~76200 SH SOLE ~~90600~~76200 0 0 Kforce Inc com 493732101 ~~142~~130 18486 SH SOLE 18486 0 0 Kraft Foods Inc com 50075N104 223 10000 SH SOLE 10000 0 0 LECG Corp com 523234102 ~~181~~66 ~~26908~~25908 SH SOLE ~~26908~~25908 0 0 LeCroy Corp com 52324W109 8988 ~~29166~~27966 SH SOLE ~~29166~~27966 0 0 LifePoint Hospitals Inc com 53219L109 ~~898~~820 39300 SH SOLE 39300 0 0 Livewire Mobile Inc com 53837P102 5161 ~~530450~~472333 SH SOLE ~~530450~~472333 0 0 Mc Donalds com 580135101 ~~826~~2144 ~~13284~~39284 SH SOLE ~~13284~~39284 0 0 McCormick & Schmicks Seafd R com 579793100 ~~255~~236 ~~63339~~60539 SH SOLE ~~63339~~60539 0 0 Mediware Information Sys Inc com 584946107 ~~156~~130 ~~32411~~31011 SH SOLE ~~32411~~31011 0 0 Mentor Graphics Corp com 587200106 ~~645~~532 ~~124760~~119760 SH SOLE ~~124760~~119760 0 0 Mercer Ins Group Inc com 587902107 ~~302~~341 23865 SH SOLE 23865 0 0 Mercury Computer Sys com 589378108 8572 ~~13400~~13100 SH SOLE ~~13400~~13100 0 0 Microsoft Corp com 594918104 ~~397~~375 20400 SH SOLE 20400 0 0 Montpelier Re Holdings Ltd com G62185106 ~~591~~456 35200 SH SOLE 35200 0 0 Motorola Inc com 620076109 ~~343~~315 ~~77400~~74400 SH SOLE ~~77400~~74400 0 0 Myers Inds Inc com 628464109 ~~453~~335 ~~56650~~54550 SH SOLE ~~56650~~54550 0 0 Mylan Inc com 628530107 ~~885~~1153 ~~89500~~86000 SH SOLE ~~89500~~86000 0 0 ~~Nautilus Inc com 63910B102 79 35807 SH SOLE 35807 0 0~~ Newport Corp com 651824104 ~~332~~207 ~~48923~~46923 SH SOLE ~~48923~~46923 0 0 Nokia Corp com 654902204 ~~577~~432 37000 SH SOLE 37000 0 0 ~~Novatel Wireless Inc com 66987M604 361 77891 SH SOLE 77891 0 0~~ Novell Inc com 670006105 ~~427~~449 ~~109702~~105502 SH SOLE ~~109702~~105502 0 0 ~~Novellus Sys Inc com 670008101 202 16400 SH SOLE 16400 0 0~~ OM Group Inc com 670872100 ~~733~~647 ~~34700~~33500 SH SOLE ~~34700~~33500 0 0 Office Depot Inc com 676220106 ~~283~~120 ~~95000~~91400 SH SOLE ~~95000~~91400 0 0 On-Assignment Inc com 682159108 ~~941~~450 165997 SH SOLE 165997 0 0 Owens Ill Inc com 690768403 ~~607~~309 ~~22200~~21400 SH SOLE ~~22200~~21400 0 0 Pacific Sunwear Calif Inc com 694873100 129 ~~81131~~77731 SH SOLE ~~81131~~77731 0 0 Pantry Inc com 698657103 ~~612~~502 28509 SH SOLE 28509 0 0 Pfizer Inc com 717081103 ~~289~~222 16300 SH SOLE 16300 0 0 Photronics Inc com 719405102 ~~288~~137 ~~147783~~142283 SH SOLE ~~147783~~142283 0 0 Plantronics Inc com 727493108 ~~317~~290 24000 SH SOLE 24000 0 0 Powerwave Technologies Inc com 739363109 ~~150~~172 ~~300800~~289800 SH SOLE ~~300800~~289800 0 0 Presstek Inc com 741113104 8655 26776 SH SOLE 26776 0 0 Pride Intl Inc Del com 74153Q102 ~~177~~200 11100 SH SOLE 11100 0 0 Procter & Gamble Co com 742718109 1413 30000 SH SOLE 30000 0 0 RF MicroDevices Inc com 749941100 91150 ~~117081~~112781 SH SOLE ~~117081~~112781 0 0 RTI Biologics Inc com 74975N105 ~~169~~161 ~~61216~~56505 SH SOLE ~~61216~~56505 0 0 Rackable Systems Inc com 750077109 ~~191~~515 ~~48572~~126920 SH SOLE ~~48572~~126920 0 0 Radisys Corp com 750459109 ~~349~~367 ~~63032~~60632 SH SOLE ~~63032~~60632 0 0 Ruby Tuesday Inc com 781182100 ~~130~~213 ~~83500~~73100 SH SOLE ~~83500~~73100 0 0 SAIA Inc com 81111T102 ~~283~~312 26100 SH SOLE 26100 0 0 SLM Corp com 78442P106 ~~282~~107 ~~31700~~21700 SH SOLE ~~31700~~21700 0 0 Safeway Inc com 786514208 ~~1300~~1104 54700 SH SOLE 54700 0 0 Sara Lee Corp com 803111103 ~~1021~~843 104283 SH SOLE 104283 0 0 ~~Sentry Technology com 81731K101 1 45100 SH SOLE 45100 0 0~~ Service Corp Intl com 817565104 ~~124~~84 ~~25000~~24000 SH SOLE ~~25000~~24000 0 0 ~~Skyworks Solutions Inc com 83088M102 69 12494 SH SOLE 12494 0 0~~ Sonic Innovations Inc com 83545M109 88174 ~~88414~~162580 SH SOLE ~~88414~~162580 0 0 Southwest Airls Co com 844741108 ~~931~~656 ~~108000~~103600 SH SOLE ~~108000~~103600 0 0 StarTek Inc com 85569C107 ~~154~~107 ~~34542~~34392 SH SOLE ~~34542~~34392 0 0 Starbucks Corp com 855244109 ~~468~~661 ~~49500~~59500 SH SOLE ~~49500~~59500 0 0 Sun Microsystems Inc com 866810104 ~~493~~799 ~~129150~~109150 SH SOLE ~~129150~~109150 0 0 Sunpower Corp Cl B com 867652307 ~~270~~169 ~~8886~~8526 SH SOLE ~~8886~~8526 0 0 Symmetricom Inc com 871543104 ~~451~~384 ~~114194~~109794 SH SOLE ~~114194~~109794 0 0 Synopsys Inc com 871607107 ~~970~~1045 ~~52392~~50392 SH SOLE ~~52392~~50392 0 0 TII Network Technologies Inc com 872479209 910 15000 SH SOLE 15000 0 0 Theragenics Corp com 883375107 398 ~~340330~~326330 SH SOLE ~~340330~~326330 0 0 Thomas Weisel Partners Group ~~com~~Inccom 884481102 ~~449~~328 ~~95045~~91545 SH SOLE ~~95045~~91545 0 0 Time Warner Cable Inc com ~~887317105~~88732J207 ~~593~~122 ~~58900~~4927 SH SOLE ~~58900~~4927 0 0 Time Warner Inc com 887317303 333 17233 SH SOLE 17233 0 0 Transocean Ltd com G90073100 ~~142~~176 2997 SH SOLE 2997 0 0 Tyco Intl Ltd com H89128104 726 37100 SH SOLE 37100 0 0 UCBH Holdings Inc com 90262T308 ~~374~~203 ~~54419~~134619 SH SOLE ~~54419~~134619 0 0 United Parcel Service Inc com 911312106 ~~519~~955 ~~9400~~19400 SH SOLE ~~9400~~19400 0 0 UnitedHealth Group Inc com 91324P102 216 10300 SH SOLE 10300 0 0 Urologix Inc com 917273104 5932 ~~107928~~84328 SH SOLE ~~107928~~84328 0 0 Varian Med Sys Inc com 92220P105 457 15000 SH SOLE 15000 0 0 Vignette Corp com 926734104 ~~806~~709 ~~85650~~106150 SH SOLE ~~85650~~106150 0 0 Vishay Intertechnology Inc com 928298108 ~~545~~532 ~~159400~~152800 SH SOLE ~~159400~~152800 0 0 Wabash National Corp com 929566107 ~~213~~56 ~~47300~~45500 SH SOLE ~~47300~~45500 0 0 Waste Mgmt Inc com 94106L109 ~~1329~~1411 ~~40100~~55100 SH SOLE ~~40100~~55100 0 0 Western Digital Corp com 958102105 ~~630~~193 ~~55000~~10000 SH SOLE ~~55000~~10000 0 0 YRC Worldwide Inc com 984249102 35122 ~~12100~~27100 SH SOLE ~~12100~~27100 0 0 Zoran Cop com 98975F101 ~~566~~704 ~~82907~~80007 SH SOLE ~~82907~~80007 0 0

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