UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form 13F
Form 13F COVER PAGE
Report for the Calendar Year or Quarter Ended: December 31, 1999
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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 FEB. 17, 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: 190
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Form 13F Information Table Value Total: $550,075
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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>
ABBOTT LABS INC COM 00282410 80 2200 SH SOLE 0 0 2200
ABERCROMBIE & FITCH CO CL A COM 00289610 555 20800 SH SOLE 0 0 20800
A C T MANUFACTURING INC COM 0097310 480 12800 SH SOLE 800 0 12000
ADELPHIA COMMUNICATIONS CORP COM 00684810 755 11500 SH SOLE 0 0 11500
ADVANCED DIGITAL INFO CORP COM 00752510 253 5200 SH SOLE 500 0 4700
ADVENT SOFTWARE INC COM 00797410 664 10300 SH SOLE 700 0 9600
A E S CORP COM 00130H10 8357 111800 SH SOLE 0 0 111800
ALCOA INC COM 01381710 114625 176200 SH SOLE 19700 0 156500
ALTERA CORP COM 2144110 1115 22500 SH SOLE 0 0 22500
AMERICAN INTERNATIONAL GROUP INC COM 2687410 7647 70727 SH SOLE 0 0 70727
AMGEN INC COM 3116210 5129 85400 SH SOLE 0 0 85400
ANADARKO PETROLEUM CORP COM 3251110 9825 287900 SH SOLE 34500 0 253400
ANNUITY AND LIFE RE HOLDINGS LTD COM G0391011 7405 15500 SH SOLE 1000 0 14500
APACHE CORP COM 3741110 1034 28000 SH SOLE 28000 0 0
APOLLO GROUP INC COM 3760410 658 32800 SH SOLE 0 0 32800
APPLIED MATERIALS INC COM 3822210 9958 78600 SH SOLE 10000 0 68600
ASTROPOWER INC COM 04644A10 1770 55000 SH SOLE 0 0 55000
AT HOME CORP COM 04591910 7793 18500 SH SOLE 0 0 18500
AUTOMATIC DATA PROCESSING INC COM 5301510 162 3000 SH SOLE 0 0 3000
BARRETT RESOURCES CORP COM 6848020 9229 313500 SH SOLE 68500 0 245000
BED BATH & BEYOND INC COM 7589610 1008 29000 SH SOLE 5000 0 24000
BEST BUY COMPANY INC COM 8651610 126 2500 SH SOLE 0 0 2500
BEST SOFTWARE INC COM 08657910 9472 16000 SH SOLE 1000 0 15000
BETHLEHEM STEEL CORP COM 8750910 2513 300000 SH SOLE 50000 0 250000
BIOGEN INC COM 9059710 7664 90700 SH SOLE 0 0 90700
BIOMET INC COM 9061310 1312 32800 SH SOLE 0 0 32800
B J SERVICES CO COM 5548210 15007 358900 SH SOLE 117000 0 241900
B M C SOFTWARE INC COM 5592110 320 4000 SH SOLE 0 0 4000
BRIO TECHNOLOGY INC COM 10970410 6403 9600 SH SOLE 400 0 9200
BROADCOM CORP COM 11132010 7409 1500 SH SOLE 0 0 1500
BROADWING INC COM 11162010 016465 446500 SH SOLE 22000 0 424500
CARDINAL HEALTH INC COM 14149Y10 940 19625 SH SOLE 0 0 19625
CDNOW INC COM 12508610 8168 17000 SH SOLE 0 0 17000
CHEAP TICKETS INC COM 16267210 9356 26000 SH SOLE 0 0 26000
CHECKFREE CORP COM 16281210 878 8400 SH SOLE 0 0 8400
CHEMDEX CORP COM 16359510 11221 11000 SH SOLE 0 0 11000
CIENA CORP COM 17177910 1868 15100 SH SOLE 0 0 15100
CINTAS CORP COM 17290810 1782 33550 SH SOLE 0 0 33550
CISCO SYSTEMS INC COM 17275R10 6106 57000 SH SOLE 0 0 57000
CITIGROUP INC COM 17296710 110650 191250 SH SOLE 4000 0 187250
CMGI INC COM 12575010 97199 26000 SH SOLE 0 0 26000
COCA COLA CO COM 19121610 93 1600 SH SOLE 0 0 1600
COMCAST CORP COM 20030020 05534 115600 SH SOLE 0 0 115600
COMCAST CORP COM 20030010 15633 111400 SH SOLE 0 0 111400
COMPUWARE CORP COM 20563810 1352 36300 SH SOLE 0 0 36300
CONCORD COMMUNICATIONS INC COM 20618610 8426 9600 SH SOLE 600 0 9000
CONCORD E F S INC COM 20619710 510525 408750 SH SOLE 10000 0 398750
CONEXANT SYSTEMS INC COM 20714210 0996 15000 SH SOLE 0 0 15000
COOPER CAMERON CORP COM 21664010 214040 286900 SH SOLE 98300 0 188600
COST PLUS INC CALIF COM 22148510 5623 17500 SH SOLE 1100 0 16400
CROSS TIMBERS OIL CO COM 22757310 24375 482725 SH SOLE 121800 0 360925
CYTYC CORP COM 23294610 31160 19000 SH SOLE 1200 0 17800
DIONEX CORP COM 25454610 1100 26700 SH SOLE 0 0 26700
WALT DISNEY CO COM 25468710 670 2400 SH SOLE 0 0 2400
D S T SYSTEMS INC COM 23332510 794 10400 SH SOLE 0 0 10400
DYNEGY INC COM 26816Q10 14425 182000 SH SOLE 57000 0 125000
E M C CORP MA COM 26864810 11231 102800 SH SOLE 0 0 102800
EAGLE U S A AIRFREIGHT INC COM 27001810 483 11200 SH SOLE 700 0 10500
ECLIPSYS CORP COM 27885610 9265 10350 SH SOLE 650 0 9700
EMMIS COMMUNICATIONS CORP COM 29152510 31147 9200 SH SOLE 500 0 8700
ENSCO INTERNATIONAL INC COM 26874Q10 04413 192900 SH SOLE 192900 0 0
E TEK DYNAMICS INC COM 26924010 76731 50000 SH SOLE 0 0 50000
EXAR CORP COM 30064510 583 9900 SH SOLE 600 0 9300
EXTREME NETWORKS INC COM 30226D10 6209 2500 SH SOLE 0 0 2500
FASTENAL COMPANY COM 31190010 661 14700 SH SOLE 0 0 14700
FIRSTAR CORP NEW COM 33761C10 380 18000 SH SOLE 0 0 18000
FISERV INC COM 33773810 9660 252150 SH SOLE 0 0 252150
FREEMARKETS INC COM 35660210 29557 28000 SH SOLE 0 0 28000
GALILEO CORP COM 36354410 449 15000 SH SOLE 0 0 15000
GASONICS INTERNATIONAL CORP COM 36727810 450 22800 SH SOLE 1500 0 21300
GENERAL ELECTRIC CO COM 36960410 464 3000 SH SOLE 0 0 3000
GILLETTE CO COM 37576610 60 1446 SH SOLE 0 0 1446
GLOBAL MARINE INC COM 37935240 8997 541200 SH SOLE 241200 0 300000
GREAT PLAINS SOFTWARE INC COM 39119E10 5759 10150 SH SOLE 650 0 9500
GREY WOLF INC COM 39788810 81754 610000 SH SOLE 610000 0 0
HAIN FOOD GROUP INC COM 40521910 452 20200 SH SOLE 900 0 19300
HARKEN ENERGY CORP COM 41255210 8 10000 SH SOLE 10000 0 0
H N C SOFTWARE INC COM 40425P10 1058 10000 SH SOLE 0 0 10000
HOME DEPOT INC COM 43707610 11138 162000 SH SOLE 2100 0 159900
ILLINOIS TOOL WORKS INC COM 45230810 1047 15500 SH SOLE 0 0 15500
ILLINOVA CORP HOLDING CO COM 45231710 1738 50000 SH SOLE 0 0 50000
INET TECHNOLOGIES INC COM 45662V10 5482 6900 SH SOLE 400 0 6500
INFOCURE CORP COM 45665A10 8231 7400 SH SOLE 500 0 6900
INSIGHT ENTERPRISES INC COM 45765U10 776 19100 SH SOLE 1200 0 17900
INTEL CORP COM 45814010 296 3600 SH SOLE 0 0 3600
IRON MOUNTAIN INC DEL COM 46284P10 637 16200 SH SOLE 1000 0 15200
JOHNSON & JOHNSON COM 47816010 2378 25500 SH SOLE 0 0 25500
JONES PHARMA INC COM 48023610 8851 19600 SH SOLE 1200 0 18400
KEANE INC COM 48666510 821 25550 SH SOLE 0 0 25550
KOHLS CORP COM 50025510 1220 16900 SH SOLE 0 0 16900
K V PHARMACEUTICAL CO COM 48274010 246 11200 SH SOLE 700 0 10500
LEXMARK INTERNATIONAL GROUP INC COM 52977110 81 900 SH SOLE 0 0 900
LIQUID AUDIO INC COM 53631T10 2315 12000 SH SOLE 0 0 12000
L T V CORP COM 50221010 825 200000 SH SOLE 200000 0 0
LUCENT TECHNOLOGIES INC COM 54946310 299 3980 SH SOLE 0 0 3980
MACROMEDIA INC COM 55610010 585 8000 SH SOLE 500 0 7500
MARINE DRILLING COS INC COM 56824020 2132 95000 SH SOLE 20000 0 75000
M B N A CORP COM 55262L10 4522 165950 SH SOLE 0 0 165950
MCAFEE.COM CORP COM 57906210 045 1000 SH SOLE 100 0 900
MCI WORLDCOM INC COM 55268B10 66559 123600 SH SOLE 0 0 123600
MEDIMMUNE INC COM 58469910 3069 18500 SH SOLE 2000 0 16500
MEDQUIST INC COM 58494910 250 9700 SH SOLE 700 0 9000
MEDTRONIC INC COM 58505510 845 23196 SH SOLE 0 0 23196
MERCK & CO INC COM 58933110 141 2100 SH SOLE 0 0 2100
M G I C INVESTMENT CORP WIS COM 55284810 933 15500 SH SOLE 0 0 15500
MICROSOFT CORP COM 59491810 309 2650 SH SOLE 0 0 2650
MKS INSTRUMENTS INC COM 55306N10 4694 19200 SH SOLE 1200 0 18000
MOLEX INC COM 60855410 7288 161050 SH SOLE 0 0 161050
MOOG INC COM 61539430 513 19000 SH SOLE 0 0 19000
MOTOROLA INC COM 62007610 243 1650 SH SOLE 0 0 1650
NABORS INDUSTRIES INC COM 62956810 14491 468400 SH SOLE 148400 0 320000
N C O GROUP INC COM 62885810 199 6600 SH SOLE 400 0 6200
NET2PHONE INC COM 64108N10 6356 7750 SH SOLE 0 0 7750
NEWELL COMPANY COM 65119210 603 20800 SH SOLE 0 0 20800
NEWPARK RESOURCES INC COM 65171850 919 150000 SH SOLE 0 0 150000
NOVELLUS SYSTEMS INC COM 67000810 490 4000 SH SOLE 0 0 4000
NUCOR CORP COM 67034610 44 800 SH SOLE 0 0 800
OCEAN ENERGY INC COM 67481E10 6775 100000 SH SOLE 100000 0 0
OMNICARE INC COM 68190410 266 22200 SH SOLE 0 0 22200
OMNICOM GROUP INC COM 68191910 10730 107300 SH SOLE 0 0 107300
ONESOURCE INFORMATION SERVICES INC COM 68272J10 667 5000 SH SOLE 0 0 5000
ORACLE CORP COM 68389X10 18636 166300 SH SOLE 8000 0 158300
OUTBACK STEAKHOUSE INC COM 68989910 674 26000 SH SOLE 0 0 26000
PAIRGAIN TECHNOLOGIES INC COM 69593410 284 20000 SH SOLE 0 0 20000
PAPA JOHNS INTL INC COM 69881310 620 23800 SH SOLE 0 0 23800
PARAMETRIC TECHNOLOGY CORP COM 69917310 514 19000 SH SOLE 0 0 19000
PAYCHEX INC COM 70432610 6869 171725 SH SOLE 0 0 171725
PE CORP COM 69332S10 212224 101600 SH SOLE 0 0 101600
PEOPLESOFT INC COM 71271310 437 20500 SH SOLE 0 0 20500
PEPSICO INC COM 71344810 56 1600 SH SOLE 0 0 1600
PF CHANGS CHINA BISTRO INC COM 69333Y10 8565 22700 SH SOLE 1400 0 21300
PFIZER INC COM 71708110 52 1600 SH SOLE 0 0 1600
PHOTRONICS CORP COM 71940610 581 20300 SH SOLE 1300 0 19000
PINNACLE SYSTEMS INC COM 72348110 273 6700 SH SOLE 400 0 6300
POLYCOM INC COM 73172K10 720 11300 SH SOLE 700 0 10600
POWER INTEGRATIONS INC COM 73927610 3316 6600 SH SOLE 400 0 6200
POWERWAVE TECHNOLOGIES INC COM 73936310 321 5500 SH SOLE 300 0 5200
PRIMUS TELECOM GROUP INC COM 74192910 796 20800 SH SOLE 1300 0 19500
PRIORITY HEALTHCARE CORP COM 74264T10 2232 8000 SH SOLE 0 0 8000
PROCTER & GAMBLE CO COM 74271810 7757 70800 SH SOLE 0 0 70800
PROVANT INC COM 74372410 6311 12300 SH SOLE 800 0 11500
QUOTESMITH COM INC COM 74911710 711 1000 SH SOLE 0 0 1000
RADISYS CORP COM 75045910 390 7650 SH SOLE 500 0 7150
RAMBUS INC COM 75091710 63136 46500 SH SOLE 5000 0 41500
REMEDY CORP COM 75954810 895 18900 SH SOLE 1200 0 17700
ROWAN COMPANIES INC COM 77938210 5357 247000 SH SOLE 14400 0 232600
SAWTEK INC COM 80546810 606 9100 SH SOLE 600 0 8500
SCHLUMBERGER LTD COM 80685710 7271 129550 SH SOLE 0 0 129550
SCHWAB CHARLES CORP NEW COM 80851310 1209 31600 SH SOLE 0 0 31600
SEALED AIR CORP COM 81211510 3927 75800 SH SOLE 0 0 75800
SEMTECH CORP COM 81685010 1453 8700 SH SOLE 600 0 8100
SEPRACOR INC COM 81731510 615 6200 SH SOLE 0 0 6200
SERVICEMASTER LTD PARTNERSHIP UNIT
LTD PARTN 81761510 591 48000 SH SOLE 0 0 48000
SMITH INTERNATIONAL INC COM 83211010 2236 45000 SH SOLE 45000 0 0
SOLECTRON CORP COM 83418210 13032 137000 SH SOLE 4000 0 133000
SOUTHWEST AIRLINES CO COM 84474110 738 45750 SH SOLE 0 0 45750
SOVEREIGN BANCORP INC COM 84590510 1677 225000 SH SOLE 45000 0 180000
SPRINT PCS GROUP INC COM 85206150 610322 100700 SH SOLE 2000 0 98700
STARBUCKS CORP COM 85524410 5689 234600 SH SOLE 0 0 234600
STERICYCLE INC COM 85891210 463 24600 SH SOLE 1600 0 23000
STRYKER CORP COM 86366710 9640 138450 SH SOLE 0 0 138450
SUN MICROSYSTEMS INC COM 86681010 8572 110700 SH SOLE 8000 0 102700
SUNGARD DATA SYSTEMS INC COM 86736310 1444 60800 SH SOLE 0 0 60800
SYKES DATATRONICS INC COM 87123510 636 14500 SH SOLE 0 0 14500
TAKE TWO INTERACTIVE SOFTWARE INC COM 87405410 9267 20600 SH SOLE 1300 0 19300
TALK.COM INC COM 87426410 4696 39200 SH SOLE 2500 0 36700
TANDY CORP COM 87538210 7432 151100 SH SOLE 0 0 151100
TELLABS INC COM 87966410 1322 20600 SH SOLE 0 0 20600
TEXAS INSTRUMENTS INC COM 88250810 9247 95700 SH SOLE 1200 0 94500
TIME WARNER INC COM 88731510 10832 149800 SH SOLE 0 0 149800
TITAN CORP COM 88826610 932 19700 SH SOLE 1700 0 18000
TRANSOCEAN SEDCO FOREX INC COM G9007810 910126 300579 SH SOLE 36500 0 264079
TRITON ENERGY LTD COM G9075110 1671 81000 SH SOLE 81000 0 0
U S BANCORP COM 90297310 629 1200 SH SOLE 0 0 1200
ULTIMATE ELECTRONICS INC COM 90384910 7317 12800 SH SOLE 900 0 11900
ULTIMATE SOFTWARE GROUP INC COM 90385D10 7537 41100 SH SOLE 2600 0 38500
UNIT CORP COM 90921810 1810 235500 SH SOLE 235500 0 0
VENTANA MEDICAL SYSTEMS INC COM 92276H10 256 10300 SH SOLE 700 0 9600
VERISIGN INC COM 92343E10 214874 77900 SH SOLE 0 0 77900
VERITAS SOFTWARE CORP COM 92343610 2905 20300 SH SOLE 0 0 20300
VISUAL NETWORKS INC COM 92844410 8888 11200 SH SOLE 700 0 10500
VISX INC COM 92844W10 2205 42600 SH SOLE 0 0 42600
VITESSE SEMICONDUCTOR CORP COM 92849710 341 6500 SH SOLE 0 0 6500
WAL MART STORES INC COM 93114210 7210 104300 SH SOLE 0 0 104300
WALGREEN CO COM 93142210 53 1800 SH SOLE 0 0 1800
WARNER LAMBERT CO COM 93448810 33 400 SH SOLE 0 0 400
WESTERN WIRELESS CORP COM 95988E20 433 500 SH SOLE 500 0 0
WIND RIVER SYSTEMS INC COM 97314910 3835 104700 SH SOLE 0 0 104700
W M S INDUSTRIES INC COM 92929710 428 32600 SH SOLE 2100 0 30500
WRIGLEY WILLIAM JR CO COM 98252610 921 11100 SH SOLE 0 0 11100
</TABLE>
