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, 2000
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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: CASTLEARK MANAGEMENT L.L.C.
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Address: 101 N. WACKER DR. SUITE 610
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CHICAGO, IL 60606
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Form 13F File Number: 28-_____________________
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: JAMES H. CASTELLINI
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Title: CFO
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Phone: 312 456-9682
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Signature, Place, and Date of Signing:
CHICAGO, IL May 16, 2000
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[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:
[If there are no entries in this list, omit this section.] NONE
Form 13F File Number Name
28- _________________ ___________________________________-
[Repeat as necessary.]
<PAGE>
Form 13F SUMMARY PAGE
Report Summary:
Number of Other Included Managers: 0
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Form 13F Information Table Entry Total: 203
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Form 13F Information Table Value Total: $661,043
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(thousands)
List of other Included Managers:
Provide a numbered list of the name(s) and Form 13F 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.]
No. Form 13F File Number Name
____ 28-_____________________ __________________________
[Repeat as necessary.]
<PAGE>
<TABLE>
<CAPTION>
FORM 13F INFORMATION TABLE
VALUE SHARES/ SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE
- ------------------------------ ---------------- --------- -------- -------- --- ---- ------- ------------ -------- -------- --------
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C> <C>
A C T MANUFACTURING INC COM 000973107 990094 17700 SH SOLE 1200 0 16500
A E S CORP COM 00130H105 7229250 91800 SH SOLE 0 0 91800
ABBOTT LABS INC COM 002824100 77412 2200 SH SOLE 2200 0 0
ABERCROMBIE & FITCH CO CL A COM 002896207 347200 21700 SH SOLE 1700 0 20000
ACXIOM CORP COM 005125109 339150 10200 SH SOLE 700 0 9500
ADELPHIA COMMUNICATIONS CORP COM 006848105 563500 11500 SH SOLE 500 0 11000
ADVANCED DIGITAL INFO CORP COM 007525108 356200 10400 SH SOLE 1000 0 9400
ADVANCED MICRO DEVICES INC COM 007903107 13911837 243800 SH SOLE 40000 0 203800
ADVENT SOFTWARE INC COM 007974108 800519 17450 SH SOLE 1250 0 16200
ALCOA INC COM 013817101 2774875 39500 SH SOLE 0 0 39500
ALTEON WEBSYSTEMS INC COM 02145A109 5473500 66750 SH SOLE 1350 0 65400
ALTERA CORP COM 021441100 1722525 19300 SH SOLE 300 0 19000
AMERICAN INTL GROUP INC COM 026874107 6693406 61127 SH SOLE 796 0 60331
AMGEN INC COM 031162100 5241425 85400 SH SOLE 4800 0 80600
ANADARKO PETROLEUM CORP COM 032511107 15494344 400500 SH SOLE 139800 0 260700
APACHE CORP COM 037411105 1393000 28000 SH SOLE 28000 0 0
APEX INC COM 037580107 367537 9900 SH SOLE 900 0 9000
APOLLO GROUP INC CL A COM 037604105 924550 32800 SH SOLE 800 0 32000
APPLIED MATERIALS INC COM 038222105 11913200 126400 SH SOLE 16600 0 109800
ASTROPOWER INC COM 04644A101 7658062 237000 SH SOLE 167000 0 70000
AUTOMATIC DATA PROCESSING INC COM 053015103 144750 3000 SH SOLE 3000 0 0
B J SERVICES CO COM 055482103 19237050 260400 SH SOLE 18500 0 241900
B V R TECHNOLOGIES LTD COM M20514101 69375 5000 SH SOLE 5000 0 0
BARRETT RESOURCES CORP COM 068480201 13111537 439800 SH SOLE 93500 0 346300
BED BATH & BEYOND INC COM 075896100 945000 24000 SH SOLE 1000 0 23000
BEST BUY COMPANY INC COM 086516101 215000 2500 SH SOLE 2500 0 0
BETHLEHEM STEEL CORP COM 087509105 300000 50000 SH SOLE 50000 0 0
BINDVIEW DEVELOPMENT CORP COM 090327107 132016 4250 SH SOLE 450 0 3800
BIO TECHNOLOGY GENERAL CORP COM 090578105 244900 15800 SH SOLE 1100 0 14700
BIOGEN INC COM 090597105 1704950 24400 SH SOLE 1400 0 23000
BIOMET INC COM 090613100 1193100 32800 SH SOLE 2800 0 30000
BIOSITE DIAGNOSTICS INC COM 090945106 221812 9100 SH SOLE 600 0 8500
BROADBASE SOFTWARE INC COM 11130R100 79750 1000 SH SOLE 0 0 1000
BROADCOM CORP COM 111320107 728625 3000 SH SOLE 0 0 3000
BROADVISION INC COM 111412102 448750 10000 SH SOLE 0 0 10000
BROADWING INC COM 111620100 18236750 490400 SH SOLE 39600 0 450800
CARDINAL HEALTH INC COM 14149Y108 1235184 26925 SH SOLE 3400 0 23525
CDNOW INC COM 125086108 64281 17000 SH SOLE 0 0 17000
CELGENE CORP COM 151020104 2608537 26200 SH SOLE 1200 0 25000
CHARLES SCHWAB CORP COM 808513105 1778231 31300 SH SOLE 4000 0 27300
CHEAP TICKETS INC COM 162672109 367250 26000 SH SOLE 1000 0 25000
CHECKFREE HOLDINGS CORP COM 162816102 592200 8400 SH SOLE 400 0 8000
CIENA CORP COM 171779101 1854037 14700 SH SOLE 200 0 14500
CINTAS CORP COM 172908105 2283652 58275 SH SOLE 7275 0 51000
CIRCUIT CITY STORES INC COM 172737108 10957500 180000 SH SOLE 36300 0 143700
CISCO SYSTEMS INC COM 17275R102 11680218 151078 SH SOLE 10000 0 141078
CITIGROUP INC COM 172967101 9726694 162450 SH SOLE 2250 0 160200
COCA COLA CO COM 191219104 75100 1600 SH SOLE 1600 0 0
COMCAST CORP CL A COM 200300101 3493875 84700 SH SOLE 4200 0 80500
COMCAST CORP-SPECIAL CL A COM 200300200 4831975 111400 SH SOLE 0 0 111400
COMPUCREDIT CORP COM 20478N100 850406 23500 SH SOLE 1700 0 21800
COMPUWARE CORP COM 205638109 853031 40500 SH SOLE 5200 0 35300
CONCORD E F S INC COM 206197105 6774591 295350 SH SOLE 3850 0 291500
COOPER CAMERON CORP COM 216640102 19741500 295200 SH SOLE 93500 0 201700
CROSS TIMBERS OIL CO COM 227573102 6305595 482725 SH SOLE 121800 0 360925
CYPRESS COMMUNICATIONS INC COM 232743104 256025 10450 SH SOLE 750 0 9700
CYTYC CORP COM 232946103 810600 16800 SH SOLE 1200 0 15600
D S T SYSTEMS INC COM 233326107 675228 10400 SH SOLE 400 0 10000
DELL COMPUTER CORP COM 247025109 11003250 204000 SH SOLE 25600 0 178400
DELTEK SYSTEMS INC COM 24785A108 339937 22200 SH SOLE 1700 0 20500
DIONEX CORP COM 254546104 1218687 37000 SH SOLE 1000 0 36000
DIVERSA CORP COM 255064107 122200 2600 SH SOLE 200 0 2400
DYNEGY INC COM 26816Q101 17509000 279080 SH SOLE 73830 0 205250
E M C CORP COM 268648102 11466000 91000 SH SOLE 1800 0 89200
E TEK DYNAMICS INC COM 269240107 6587000 28000 SH SOLE 0 0 28000
ELECTRO SCIENTIFIC IND INC COM 285229100 452400 7800 SH SOLE 600 0 7200
ELOYALTY CORP COM 290151109 290081 12150 SH SOLE 850 0 11300
EMMIS COMMUNICTNS CORP CL A COM 291525103 567300 12200 SH SOLE 800 0 11400
ENERGY CONVERSION DEVICES INC COM 292659109 51094 2500 SH SOLE 2500 0 0
ENRON CORP COM 293561106 29575625 395000 SH SOLE 105000 0 290000
ENSCO INTERNATIONAL INC COM 26874Q100 1369137 37900 SH SOLE 37900 0 0
EXAR CORP COM 300645108 819391 11450 SH SOLE 800 0 10650
EXTREME NETWORKS INC COM 30226D106 197500 2500 SH SOLE 0 0 2500
FASTENAL CO COM 311600104 703762 14700 SH SOLE 700 0 14000
FISERV INC COM 337738108 9380547 252250 SH SOLE 7600 0 244650
FREEMARKETS INC COM 356602102 3460600 28600 SH SOLE 400 0 28200
GASONICS INTERNATIONAL CORP COM 367278108 888300 22400 SH SOLE 1600 0 20800
GENERAL ELECTRIC CO COM 369604103 466875 3000 SH SOLE 3000 0 0
GILLETTE CO COM 375766102 54496 1446 SH SOLE 1446 0 0
GLOBAL CROSSING LTD COM G3921A100 7778125 190000 SH SOLE 0 0 190000
GLOBAL MARINE INC COM 379352404 12083575 476200 SH SOLE 166200 0 310000
GO2NET INC COM 383486107 334334 4150 SH SOLE 350 0 3800
GREAT PLAINS SOFTWARE INC COM 39119E105 317581 5950 SH SOLE 5950 0 0
GREY WOLF INC COM 397888108 5601094 1422500 SH SOLE 1417000 0 5500
H N C SOFTWARE INC COM 40425P107 720625 10000 SH SOLE 0 0 10000
HAIN FOOD GROUP INC COM 405219106 571912 20200 SH SOLE 900 0 19300
HARKEN ENERGY CORP COM 412552101 10000 10000 SH SOLE 10000 0 0
HOME DEPOT INC COM 437076102 6146850 95300 SH SOLE 3450 0 91850
ILLINOIS TOOL WORKS INC COM 452308109 1033175 18700 SH SOLE 2200 0 16500
IN FOCUS SYSTEMS INC COM 452919103 712669 19900 SH SOLE 1400 0 18500
INFOUSA INC COM 456818103 246375 27000 SH SOLE 2000 0 25000
INSIGHT ENTERPRISES INC COM 45765U103 426319 11700 SH SOLE 800 0 10900
INTEL CORP COM 458140100 474975 3600 SH SOLE 3600 0 0
INTERNATIONAL PAPER CO COM 460146103 1710000 40000 SH SOLE 0 0 40000
IRON MOUNTAIN INC DEL COM 462846106 551812 16200 SH SOLE 1000 0 15200
ITXC CORP COM 45069F109 211781 4500 SH SOLE 500 0 4000
JONES PHARMA INC COM 480236108 617372 20325 SH SOLE 1400 0 18925
K V PHARMACEUTICALS CO COM 482740107 739062 27500 SH SOLE 1900 0 25600
KEANE INC COM 486665102 645137 25550 SH SOLE 1000 0 24550
KENT ELECTRONICS CORP COM 490553104 394031 13500 SH SOLE 900 0 12600
KOHLS CORP COM 500255104 9891250 96500 SH SOLE 19400 0 77100
L T V CORP COM 501921100 356250 100000 SH SOLE 100000 0 0
LEXMARK INTL GROUP INC CL A COM 529771107 95175 900 SH SOLE 900 0 0
LIQUID AUDIO INC COM 53631T102 172250 13000 SH SOLE 1000 0 12000
LUCENT TECHNOLOGIES INC COM 549463107 243775 3980 SH SOLE 3980 0 0
M G I C INVESTMENT CORP WIS COM 552848103 820150 18800 SH SOLE 800 0 18000
MACROMEDIA INC COM 556100105 722500 8000 SH SOLE 500 0 7500
MACROVISION CORP COM 555904101 9060350 105200 SH SOLE 2200 0 103000
MANUGISTICS GROUP INC COM 565011106 341700 6700 SH SOLE 700 0 6000
MARINE DRILLING COS INC COM 568240204 2606562 95000 SH SOLE 20000 0 75000
MEDIMMUNE INC COM 584699102 3482500 20000 SH SOLE 3600 0 16400
MEDTRONIC INC COM 585055106 15173857 294996 SH SOLE 10300 0 284696
MERCK & CO INC COM 589331107 130462 2100 SH SOLE 2100 0 0
MERCURY COMPUTER SYSTEMS INC COM 589378108 464312 9500 SH SOLE 700 0 8800
MICREL INC COM 594739101 576000 6000 SH SOLE 0 0 6000
MICRON TECHNOLOGY INC COM 595112103 1260000 10000 SH SOLE 0 0 10000
MICROSOFT CORP COM 594918104 281562 2650 SH SOLE 2650 0 0
MICROSTRATEGY INC COM 594972101 8131637 93400 SH SOLE 2400 0 91000
MKS INSTRUMENTS INC COM 55306N104 888800 17600 SH SOLE 1100 0 16500
MOLEX INC CL A COM 608554200 11068767 249437 SH SOLE 65687 0 183750
MOOG INC CL A COM 615394202 361987 19700 SH SOLE 1700 0 18000
MOTOROLA INC COM 620076109 240900 1650 SH SOLE 1650 0 0
NABORS INDUSTRIES INC COM 629568106 24339319 627100 SH SOLE 198400 0 428700
NATIONAL OILWELL INC COM 637071101 845975 27400 SH SOLE 2200 0 25200
NET2PHONE INC COM 64108N106 458219 7750 SH SOLE 500 0 7250
NETSOLVE INC COM 64115J106 180600 5600 SH SOLE 500 0 5100
NEWELL RUBBERMAID INC COM 651229106 518581 20900 SH SOLE 900 0 20000
NEWPARK RESOURCES INC COM 651718504 2400000 300000 SH SOLE 150000 0 150000
NICE SYSTEMS LTD COM 653656108 384750 5400 SH SOLE 400 0 5000
NOVELLUS SYSTEMS INC COM 670008101 673500 12000 SH SOLE 0 0 12000
NPS PHARMACEUTICALS INC COM 62936P103 207862 13800 SH SOLE 1200 0 12600
NUCOR CORP COM 670346105 40000 800 SH SOLE 800 0 0
OCEAN ENERGY INC COM 67481E106 7187500 500000 SH SOLE 500000 0 0
OMNICOM GROUP INC COM 681919106 4007150 42800 SH SOLE 0 0 42800
ONTRACK DATA INTL INC COM 683372106 232031 22500 SH SOLE 2000 0 20500
ORACLE CORP COM 68389X105 16057456 205700 SH SOLE 19500 0 186200
OUTBACK STEAKHOUSE INC COM 686899102 824006 25700 SH SOLE 3700 0 22000
PACIFIC SUNWEAR CA INC COM 694873100 411950 10700 SH SOLE 1000 0 9700
PAPA JOHNS INTERNATIONAL INC COM 698813102 782100 23700 SH SOLE 700 0 23000
PARAMETRIC TECHNOLOGY CORP COM 699173100 785631 37300 SH SOLE 4300 0 33000
PAYCHEX INC COM 704326107 1137847 21725 SH SOLE 500 0 21225
PE CORP COM 714041126 3695950 38300 SH SOLE 2400 0 35900
PEPSICO INC COM 713448108 55800 1600 SH SOLE 1600 0 0
PF CHANGS CHINA BISTRO INC COM 69333Y108 751937 22700 SH SOLE 1400 0 21300
PFIZER INC COM 717081103 58500 1600 SH SOLE 1600 0 0
PFSWEB INC COM 717098107 100800 6300 SH SOLE 700 0 5600
PHELPS DODGE CORP COM 717265102 1421250 30000 SH SOLE 0 0 30000
PHOTRONICS CORP COM 719405102 716844 20300 SH SOLE 1300 0 19000
PINNACLE SYSTEMS INC COM 723481107 445550 13400 SH SOLE 800 0 12600
PLEXUS CORP COM 729132100 499687 7500 SH SOLE 500 0 7000
POLYCOM INC COM 73172K104 768119 9700 SH SOLE 700 0 9000
POWERWAVE TECHNOLOGIES INC COM 739363109 775000 6200 SH SOLE 400 0 5800
PRIMUS TELECOM GROUP INC COM 741929103 1090606 21100 SH SOLE 1600 0 19500
PRIORITY HEALTHCARE CORP COM 74264T102 673350 13400 SH SOLE 900 0 12500
RADISYS CORP COM 750459109 532106 8850 SH SOLE 700 0 8150
RAMBUS INC COM 750917106 2429625 8250 SH SOLE 150 0 8100
REMEDY CORP COM 759548100 796162 18900 SH SOLE 1200 0 17700
ROWAN COMPANIES INC COM 779382100 3962287 134600 SH SOLE 105000 0 29600
SCHLUMBERGER LTD COM 806857108 2910825 38050 SH SOLE 3450 0 34600
SEALED AIR CORP COM 81211K100 961331 17700 SH SOLE 2700 0 15000
SEMTECH CORP COM 816850101 557344 8700 SH SOLE 600 0 8100
SEPRACOR INC COM 817315104 895594 12300 SH SOLE 300 0 12000
SERVICEMASTER LTD PARTNERSHIP UNIT LTD PARTN 81760N109 540000 48000 SH SOLE 2000 0 46000
SITEL CORP COM 82980K107 245437 35700 SH SOLE 2500 0 33200
SMITH INTERNATIONAL INC COM 832110100 6626250 85500 SH SOLE 85500 0 0
SOLECTRON CORP COM 834182107 14501175 361400 SH SOLE 8800 0 352600
SOUTHWEST AIRLINES CO COM 844741108 952172 45750 SH SOLE 5750 0 40000
SOVEREIGN BANCORP INC COM 845905108 1361250 180000 SH SOLE 0 0 180000
SPRINT PCS GROUP INC COM 852061506 11469050 175100 SH SOLE 9100 0 166000
STARBUCKS CORP COM 855244109 8039362 179400 SH SOLE 38200 0 141200
STERICYCLE INC COM 858912108 615000 24600 SH SOLE 1600 0 23000
STONE ENERGY CORP COM 861642106 1231250 25000 SH SOLE 25000 0 0
STRYKER CORP COM 863667101 4460512 63950 SH SOLE 950 0 63000
SUN MICROSYSTEMS INC COM 866810104 9623311 102700 SH SOLE 2700 0 100000
SUNGARD DATA SYSTEMS INC COM 867363103 2295200 60800 SH SOLE 7800 0 53000
TALK.COM INC COM 874264104 366400 22900 SH SOLE 1600 0 21300
TANDY CORP COM 875382103 121800 2400 SH SOLE 2400 0 0
TECHNOLOGY SOLUTIONS CO COM 87872T108 520581 57050 SH SOLE 4450 0 52600
TEKELEC COM 879101103 412087 11100 SH SOLE 1100 0 10000
TELEFONOS DE MEXICO SA DE SV COM 879403400 3331250 50000 SH SOLE 0 0 50000
TELLABS INC COM 879664100 1297478 20600 SH SOLE 5600 0 15000
TEXAS INSTRUMENTS INC COM 882508104 8320000 52000 SH SOLE 2400 0 49600
THERMA WAVE INC COM 88343A108 312800 9200 SH SOLE 500 0 8700
TIME WARNER INC COM 887315109 3290000 32900 SH SOLE 0 0 32900
TOTAL ENTERTAINMENT INC COM 89150E100 9400 20000 SH SOLE 20000 0 0
TRANSOCEAN SEDCO FOREX INC COM G90078109 10092091 196679 SH SOLE 667 0 196012
TRITON ENERGY LTD COM G90751101 4943812 141000 SH SOLE 141000 0 0
TUT SYSTEMS INC COM 901103101 297812 5000 SH SOLE 0 0 5000
UNIT CORP COM 909218109 4884000 444000 SH SOLE 396000 0 48000
VALERO ENERGY CORP COM 91913Y100 2301562 75000 SH SOLE 75000 0 0
VENTANA MEDICAL SYSTEMS INC COM 92276H106 444831 10300 SH SOLE 700 0 9600
VENTRO CORP COM 922815105 339750 6000 SH SOLE 0 0 6000
VERISIGN INC COM 92343E102 10704200 71600 SH SOLE 2300 0 69300
VERITAS SOFTWARE CO COM 923436109 2390750 18250 SH SOLE 250 0 18000
VISUAL NETWORKS INC COM 928444108 397250 7000 SH SOLE 500 0 6500
VITESSE SEMICONDUCTOR CORP COM 928497106 616000 6400 SH SOLE 400 0 6000
WAL MART STORES INC COM 931142103 18226900 322600 SH SOLE 5800 0 316800
WALGREEN CO COM 931422109 46350 1800 SH SOLE 1800 0 0
WALT DISNEY CO COM 254687106 99000 2400 SH SOLE 2400 0 0
WARNER LAMBERT CO COM 934488107 39075 400 SH SOLE 400 0 0
WEBTRENDS CORP COM 94844D104 496800 6900 SH SOLE 500 0 6400
WORLDCOM INC COM 55268B106 4880156 107700 SH SOLE 3600 0 104100
WRIGLEY WILLIAM JR CO COM 982526105 1006244 13100 SH SOLE 1100 0 12000
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