UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 13F
Form 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: September 30, 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: 28-05573
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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:
/s/ JAMES H. CASTELLINI CHICAGO, IL NOV. 14, 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>
Number of Other Included Managers: NONE
Form 13F Information Table Entry Total: 209
Form 13F Information Table Value Total: $784,972 (thousands)
List of Other Included Managers: NONE
<TABLE>
<CAPTION>
TITLE OF VALUE SHARES SH/ PUT/ INVSTMT OTHER VOTING AUTHORITY
NAME OF ISSUER CLASS CUSIP (x $1000) PRN AMT PRN CALL DSCRETN MANAGERS SOLE SHARED NONE
-------------------- ---------- --------- --------- -------- --- ---- ------- -------- ---- ------ ----
<S> <C> <C> <C> <C> <C> <C> <C> <C> <C>
ABBOTT LABS INC COM 002824100 105 2200 SH SOLE 2200 0 0
ACCREDO HEALTH INC COM 00437V104 1075 22000 SH SOLE 2000 0 20000
ACLARA BIOSCIENCES INC COM 00461P106 714 23500 SH SOLE 700 0 22800
ACTEL CORP COM 004934105 482 13400 SH SOLE 900 0 12500
ADELPHIA COMMUNICATIONS CORP COM 006848105 317 11500 SH SOLE 500 0 11000
ADMINISTAFF INC COM 007094105 1158 15300 SH SOLE 1100 0 14200
ADVENT SOFTWARE INC COM 007974108 1233 17650 SH SOLE 1450 0 16200
A E S CORP COM 00130H105 13741 200600 SH SOLE 17000 0 183600
A L PHARMA INC COM 020813101 752 12300 SH SOLE 1100 0 11200
ALTERA CORP COM 021441100 1461 30600 SH SOLE 600 0 30000
AMERICA ONLINE INC COM 02364J104 6601 122800 SH SOLE 12800 0 110000
AMERICAN INTNL GROUP INC COM 026874107 19271 201390 SH SOLE 20894 0 180496
AMERICREDIT CORP COM 03060R101 1325 46000 SH SOLE 4500 0 41500
AMGEN INC COM 031162100 6585 94300 SH SOLE 13700 0 80600
ANADARKO PETROLEUM CORP COM 032511107 26145 393400 SH SOLE 137700 0 255700
APOLLO GROUP INC CL A COM 037604105 1109 27800 SH SOLE 800 0 27000
ASTROPOWER INC COM 04644A101 12203 307950 SH SOLE 162050 0 145900
AUTOMATIC DATA PROCESSING INC COM 053015103 201 3000 SH SOLE 3000 0 0
AVOCENT CORP COM 053893103 12719 230736 SH SOLE 24317 0 206419
BARRETT RESOURCES CORP COM 068480201 18343 485100 SH SOLE 150800 0 334300
BED BATH & BEYOND INC COM 075896100 1171 48000 SH SOLE 2000 0 46000
BENCHMARK ELECTRONICS INC COM 08160H101 655 12600 SH SOLE 1100 0 11500
BEST BUY COMPANY INC COM 086516101 420 6600 SH SOLE 6600 0 0
BIOGEN INC COM 090597105 1074 17600 SH SOLE 1600 0 16000
BIOMET INC COM 090613100 1733 49500 SH SOLE 4500 0 45000
BIOSITE DIAGNOSTICS INC COM 090945106 227 5700 SH SOLE 400 0 5300
B J SERVICES CO COM 055482103 9902 162000 SH SOLE 12500 0 149500
BROADBASE SOFTWARE INC COM 11130R100 298 22000 SH SOLE 0 0 22000
BROADCOM CORP COM 111320107 11895 48800 SH SOLE 5300 0 43500
BROADVISION INC COM 111412102 270 10500 SH SOLE 500 0 10000
BROADWING INC COM 111620100 9913 387800 SH SOLE 32000 0 355800
CARDINAL HEALTH INC COM 14149Y108 14271 161825 SH SOLE 20300 0 141525
CELGENE CORP COM 151020104 7800 131100 SH SOLE 16100 0 115000
CHEAP TICKETS INC COM 162672109 291 28000 SH SOLE 3000 0 25000
CHECKFREE HOLDINGS CORP COM 162816102 352 8400 SH SOLE 400 0 8000
CHEESECAKE FACTORY INC COM 163072101 718 16600 SH SOLE 1600 0 15000
CIENA CORP COM 171779101 2555 20800 SH SOLE 800 0 20000
CINTAS CORP COM 172908105 2234 51275 SH SOLE 7475 0 43800
CISCO SYSTEMS INC COM 17275R102 6238 112900 SH SOLE 22500 0 90400
CITIGROUP INC COM 172967101 15105 279392 SH SOLE 28459 0 250933
CITRIX SYSTEMS INC COM 177376100 241 12000 SH SOLE 0 0 12000
COCA COLA CO COM 191219104 88 1600 SH SOLE 1600 0 0
COMCAST CORP CL A COM 200300101 3446 84700 SH SOLE 4200 0 80500
COMCAST CORP-SPECIAL CL A COM 200300200 8175 199700 SH SOLE 28300 0 171400
COMPUCREDIT CORP COM 20478N100 1700 30300 SH SOLE 2500 0 27800
CONCORD E F S INC COM 206197105 14201 399850 SH SOLE 38350 0 361500
COOPER CAMERON CORP COM 216640102 20183 273900 SH SOLE 75300 0 198600
CORE INC COM 21867P102 48 8000 SH SOLE 8000 0 0
CORE LABORATORIES NV COM N22717107 1842 75000 SH SOLE 75000 0 0
CORINTHIAN COLLEGES INC COM 218868107 620 10500 SH SOLE 1200 0 9300
COST PLUS INC COM 221485105 554 18400 SH SOLE 1900 0 16500
CROSS TIMBERS OIL CO COM 227573102 14940 778636 SH SOLE 237249 0 541387
CROSSWORLDS SOFTWARE INC COM 22769P109 273 13800 SH SOLE 1400 0 12400
DAL-TILE INTERNATIONAL INC COM 23426R108 113 9000 SH SOLE 9000 0 0
DEVRY INC COM 251893103 967 25700 SH SOLE 2500 0 23200
DIONEX CORP COM 254546104 1041 37700 SH SOLE 1700 0 36000
WALT DISNEY CO COM 254687106 92 2400 SH SOLE 2400 0 0
DSP GROUP INC COM 23332B106 445 11900 SH SOLE 1100 0 10800
D S T SYSTEMS INC COM 233326107 1222 10400 SH SOLE 400 0 10000
E M C CORP COM 268648102 8336 84100 SH SOLE 13700 0 70400
EDISON SCHOOLS INC COM 281033100 889 28000 SH SOLE 3000 0 25000
ELANTEC SEMICONDUCTOR INC COM 284155108 578 5800 SH SOLE 500 0 5300
ELASTIC NETWORKS INC COM 284159100 321 23000 SH SOLE 2000 0 21000
ENRON CORP COM 293561106 28452 324700 SH SOLE 99700 0 225000
ENSCO INTERNATIONAL INC COM 26874Q100 13196 345000 SH SOLE 230000 0 115000
EXAR CORP COM 300645108 1258 10400 SH SOLE 950 0 9450
EXTREME NETWORKS INC COM 30226D106 1260 11000 SH SOLE 0 0 11000
FASTENAL CO COM 311600104 732 12700 SH SOLE 700 0 12000
FINISAR CORP COM 31787A101 484 10000 SH SOLE 0 0 10000
FISERV INC COM 337738108 10014 167250 SH SOLE 18700 0 148550
FLEXTRONICS INTL LTD COM Y2573F102 2053 25000 SH SOLE 25000 0 0
FREEMARKETS INC COM 356602102 1845 32300 SH SOLE 100 0 32200
FURNITURE BRANDS INTNL INC COM 360921100 831 50000 SH SOLE 50000 0 0
GENERAL ELECTRIC CO COM 369604103 415 7200 SH SOLE 7200 0 0
GILLETTE CO COM 375766102 45 1446 SH SOLE 1446 0 0
GLOBAL MARINE INC COM 379352404 15663 507300 SH SOLE 169300 0 338000
GREY WOLF INC COM 397888108 15128 2630900 SH SOLE 2161400 0 469500
HAIN CELESTIAL GROUP INC COM 405217100 499 14200 SH SOLE 900 0 13300
HALL KINION & ASSOCIATES INC COM 406069104 313 11000 SH SOLE 1000 0 10000
HALLIBURTON CO COM 406216101 5970 122000 SH SOLE 76000 0 46000
HARKEN ENERGY CORP COM 412552101 6 10000 SH SOLE 10000 0 0
HEIDRICK & STRUGGLES INTL INC COM 422819102 411 8000 SH SOLE 500 0 7500
H N C SOFTWARE INC COM 40425P107 818 10000 SH SOLE 0 0 10000
HOME DEPOT INC COM 437076102 183 3450 SH SOLE 3450 0 0
ILLINOIS TOOL WORKS INC COM 452308109 900 16100 SH SOLE 2100 0 14000
IN FOCUS SYSTEMS INC COM 452919103 1412 26650 SH SOLE 2150 0 24500
INFOUSA INC COM 456818103 150 30000 SH SOLE 5000 0 25000
INRANGE TECHNOLOGIES CORP COM 460593106 6095 115000 SH SOLE 10400 0 104600
INSIGHT ENTERPRISES INC COM 45765U103 429 15750 SH SOLE 900 0 14850
INTEL CORP COM 458140100 266 6400 SH SOLE 6400 0 0
INTERNAP NETWORK SVCS CORP COM 45885A102 711 22000 SH SOLE 0 0 22000
INTERWOVEN INC COM 46114T102 644 5700 SH SOLE 700 0 5000
INTUIT INC COM 461202103 1055 18500 SH SOLE 500 0 18000
INTUITIVE SURGICAL INC COM 46120E107 294 25000 SH SOLE 2000 0 23000
JABIL CIRCUIT INC COM 466313103 8467 149200 SH SOLE 19200 0 130000
JDS UNIPHASE CORP COM 46612J101 5909 62400 SH SOLE 6800 0 55600
JUNIPER NETWORKS INC COM 48203R104 1489 6800 SH SOLE 6800 0 0
KENT ELECTRONICS CORP COM 490553104 513 21500 SH SOLE 1900 0 19600
KOHLS CORP COM 500255104 10141 175800 SH SOLE 26600 0 149200
K V PHARMACEUTICALS CO COM 482740107 743 21150 SH SOLE 1750 0 19400
LEAP WIRELESS INTL INC COM 521863100 5343 85400 SH SOLE 9800 0 75600
LEXICON GENETICS INC COM 528872104 5490 173600 SH SOLE 56900 0 116700
LIQUID AUDIO INC COM 53631T102 477 106000 SH SOLE 5500 0 100500
LUCENT TECHNOLOGIES INC COM 549463107 64 2104 SH SOLE 2104 0 0
MACROMEDIA INC COM 556100105 647 8000 SH SOLE 400 0 7600
MACROVISION CORP COM 555904101 10854 134000 SH SOLE 10800 0 123200
MANUGISTICS GROUP INC COM 565011106 1011 10300 SH SOLE 1300 0 9000
MARINE DRILLING COS INC COM 568240204 3036 106300 SH SOLE 20700 0 85600
MARSH & MCLENNAN COS INC COM 571748102 12386 93300 SH SOLE 10000 0 83300
MCMORAN EXPLORATION INC COM 582411104 4831 416500 SH SOLE 316500 0 100000
MEDICIS PHARMACEUTICAL INC A COM 584690309 806 13100 SH SOLE 1100 0 12000
MEDIMMUNE INC COM 584699102 3561 46100 SH SOLE 12900 0 33200
MEDTRONIC INC COM 585055106 301 5800 SH SOLE 5800 0 0
MELLON FINANCIAL CORP COM 58551A108 3014 65000 SH SOLE 65000 0 0
MERCK & CO INC COM 589331107 149 2000 SH SOLE 2000 0 0
MERRILL LYNCH & CO COM 590188108 211 3200 SH SOLE 3200 0 0
METRIS COMPANIES INC COM 591598107 1379 34900 SH SOLE 3000 0 31900
M G I C INVESTMENT CORP WIS COM 552848103 892 14600 SH SOLE 600 0 14000
MICREL INC COM 594739101 1246 18600 SH SOLE 1400 0 17200
MICROSOFT CORP COM 594918104 160 2650 SH SOLE 2650 0 0
MICROSTRATEGY INC COM 594972101 1857 68000 SH SOLE 0 0 68000
MILLENNIUM CELL INC COM 60038B105 9718 438000 SH SOLE 258000 0 180000
MKS INSTRUMENTS INC COM 55306N104 986 36000 SH SOLE 2500 0 33500
MOLECULAR DEVICES CORP COM 60851C101 462 4700 SH SOLE 200 0 4500
MOLEX INC CL A COM 608554200 10966 264637 SH SOLE 80887 0 183750
MOOG INC CL A COM 615394202 572 19000 SH SOLE 1000 0 18000
MOTOROLA INC COM 620076109 131 4650 SH SOLE 4650 0 0
NABORS INDUSTRIES INC COM 629568106 25105 479100 SH SOLE 90400 0 388700
NATIONAL OILWELL INC COM 637071101 978 31300 SH SOLE 3100 0 28200
NET.B@NK INC COM 640933107 473 40000 SH SOLE 0 0 40000
NET2PHONE INC COM 64108N106 372 16550 SH SOLE 1300 0 15250
NETWORK APPLIANCE INC COM 64120L104 20609 161800 SH SOLE 31800 0 130000
NEWPARK RESOURCES INC COM 651718504 3652 394800 SH SOLE 166800 0 228000
NICE SYSTEMS LTD COM 653656108 518 7200 SH SOLE 700 0 6500
99 CENTS ONLY STORES COM 65440K106 1194 23800 SH SOLE 2300 0 21500
NORTHWEST AIRLINES CORP COM 667280101 25 1000 SH SOLE 1000 0 0
NOVELLUS SYSTEMS INC COM 670008101 577 12400 SH SOLE 400 0 12000
NOVOSTE CORP COM 67010C101 285 6700 SH SOLE 700 0 6000
NUMERICAL TECHNOLOGIES INC COM 67053T101 576 20000 SH SOLE 1000 0 19000
NUVEEN SR INCOME FUND COM 67067Y203 1250 50 SH SOLE 0 0 50
OAK TECHNOLOGY INC COM 671802106 838 30600 SH SOLE 2600 0 28000
OCEAN ENERGY INC COM 67481E106 11269 730000 SH SOLE 548500 0 181500
ORACLE CORP COM 68389X105 11663 148100 SH SOLE 10600 0 137500
ORTHODONTIC CENTERS OF AM INC COM 68750P103 1029 30900 SH SOLE 2800 0 28100
OUTBACK STEAKHOUSE INC COM 686899102 708 26100 SH SOLE 4100 0 22000
PAPA JOHNS INTERNATIONAL INC COM 698813102 594 23700 SH SOLE 700 0 23000
PAYCHEX INC COM 704326107 1711 32587 SH SOLE 750 0 31837
PE BIOSYSTEMS GROUP COM 69332S102 1911 16400 SH SOLE 2400 0 14000
PE CORP CELERA GENOMICS GROUP COM 69332S201 747 7500 SH SOLE 400 0 7100
PENNACO ENERGY INC COM 708046107 434 25000 SH SOLE 25000 0 0
PEOPLEPC INC COM 709776108 353 60000 SH SOLE 5000 0 55000
PEPSICO INC COM 713448108 74 1600 SH SOLE 1600 0 0
PF CHANGS CHINA BISTRO INC COM 69333Y108 664 19200 SH SOLE 1200 0 18000
PFIZER INC COM 717081103 112 2500 SH SOLE 2500 0 0
PHILLIPS PETROLEUM CO COM 718507106 7405 118000 SH SOLE 118000 0 0
PLEXUS CORP COM 729132100 465 6600 SH SOLE 400 0 6200
POLY INC COM 73172K104 1353 20200 SH SOLE 1200 0 19000
PRIORITY HEALTHCARE CORP COM 74264T102 1205 15800 SH SOLE 1300 0 14500
PROVINCE HEALTHCARE CO COM 743977100 1534 38400 SH SOLE 3150 0 35250
PSS WORLD MEDICAL INC COM 69366A100 11 3000 SH SOLE 3000 0 0
QLOGIC CORP COM 747277101 8043 91400 SH SOLE 31400 0 60000
RADISYS CORP COM 750459109 756 14950 SH SOLE 1300 0 13650
RAMBUS INC COM 750917106 1421 18000 SH SOLE 1000 0 17000
RETEK INC COM 76128Q109 659 12430 SH SOLE 0 0 12430
ROWAN PANIES INC COM 779382100 10057 346800 SH SOLE 253200 0 93600
SANGAMO BIOSCIENCES INC COM 800677106 194 5000 SH SOLE 5000 0 0
SCANSOURCE INC COM 806037107 502 9400 SH SOLE 900 0 8500
SCHLUMBERGER LTD COM 806857108 704 8550 SH SOLE 8550 0 0
CHARLES SCHWAB CORP COM 808513105 181 5100 SH SOLE 5100 0 0
SEALED AIR CORP COM 81211K100 783 17300 SH SOLE 2300 0 15000
SEPRACOR INC COM 817315104 1018 8300 SH SOLE 300 0 8000
SERVICEMASTER LTD PARTNERSHIP UNIT LTD
PARTN 81760N109 474 48000 SH SOLE 2000 0 46000
SMITH INTERNATIONAL INC COM 832110100 14934 183100 SH SOLE 81100 0 102000
SOLECTRON CORP COM 834182107 18261 395900 SH SOLE 43300 0 352600
SOUTHWEST AIRLINES CO COM 844741108 1090 44950 SH SOLE 4950 0 40000
SPINNAKER EXPLORATION CO COM 84855W109 575 16500 SH SOLE 1500 0 15000
SPRINT CORP(PCS GRP) COM 852061506 228 6500 SH SOLE 4000 0 2500
STANFORD MICRODEVICES INC COM 854399102 701 13100 SH SOLE 1100 0 12000
STARBUCKS CORP COM 855244109 5420 135300 SH SOLE 28600 0 106700
STERICYCLE INC COM 858912108 745 30400 SH SOLE 2400 0 28000
STONE ENERGY CORP COM 861642106 7332 133300 SH SOLE 133300 0 0
STRYKER CORP COM 863667101 3079 71700 SH SOLE 1700 0 70000
SUN MICROSYSTEMS INC COM 866810104 10005 85700 SH SOLE 10700 0 75000
SUNGARD DATA SYSTEMS INC COM 867363103 2535 59200 SH SOLE 6200 0 53000
TELLABS INC COM 879664100 248 5200 SH SOLE 5200 0 0
TERADYNE INC COM 880770102 35 1000 SH SOLE 1000 0 0
TEXACO INC COM 881694103 2730 52000 SH SOLE 52000 0 0
TEXAS INSTRUMENTS INC COM 882508104 90 1900 SH SOLE 1900 0 0
TIME WARNER INC COM 887315109 2840 36300 SH SOLE 3400 0 32900
TOLLGRADE COMMUNICATIONS INC COM 889542106 416 3000 SH SOLE 200 0 2800
TRANSOCEAN SEDCO FOREX INC COM G90078109 12372 211041 SH SOLE 15029 0 196012
TRITON ENERGY LTD COM G90751101 13642 349800 SH SOLE 215300 0 134500
TUT SYSTEMS INC COM 901103101 475 5500 SH SOLE 500 0 5000
TVIA INC COM 87307P101 791 44100 SH SOLE 4100 0 40000
TYCO INTERNATIONAL INC COM 902124106 10370 199900 SH SOLE 19900 0 180000
TYCOM LTD COM G9144B106 656 17100 SH SOLE 2100 0 15000
UNIT CORP COM 909218109 6350 430500 SH SOLE 372500 0 58000
UNITED RENTALS INC COM 911363109 738 30600 SH SOLE 2600 0 28000
VENTRO CORP COM 922815105 191 17400 SH SOLE 1400 0 16000
VERISIGN INC COM 92343E102 11337 55970 SH SOLE 6770 0 49200
VERITAS SOFTWARE CO COM 923436109 7931 55850 SH SOLE 5450 0 50400
VITESSE SEMICONDUCTOR CORP COM 928497106 925 10400 SH SOLE 400 0 10000
WAL MART STORES INC COM 931142103 82 1700 SH SOLE 1700 0 0
WALGREEN CO COM 931422109 57 1500 SH SOLE 1500 0 0
WASTE CONNECTIONS INC COM 941053100 843 32900 SH SOLE 2900 0 30000
WEBVAN GROUP INC COM 94845V103 173 75000 SH SOLE 8000 0 67000
WILLIAMS-SONOMA INC COM 969904101 525 15100 SH SOLE 1300 0 13800
WORLDCOM INC COM 55268B106 8462 278600 SH SOLE 0 0 278600
WRIGLEY WILLIAM JR CO COM 982526105 981 13100 SH SOLE 1100 0 12000
</TABLE>
