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Institutional Investment Manager
CASTLEARK MANAGEMENT LLC
CASTLEARK MANAGEMENT LLC (CIK: 0001106832), located at 1 N Wacker Dr, Chicago, IL. Institutional holdings reported to the SEC.

Institutional Holdings (2016Q4)
Portfolio Summary: 371 holdings with a total value of $3,135,260,000.
#
Name
Shares
Value ($)
%
Options
Notes
1 HOME DEPOT INC 436,691 58,552,000 1.87%
2 MICROSOFT CORP 915,124 56,866,000 1.81%
3 EOG RES INC 537,489 54,340,000 1.73%
4 UNITEDHEALTH GROUP INC 325,120 52,032,000 1.66%
5 ISHARES TR 1,425,000 49,889,000 1.59%
6 GENERAL ELECTRIC CO 1,527,102 48,256,000 1.54%
7 SCHWAB CHARLES CORP 1,219,123 48,119,000 1.53%
8 ABIOMED INC 407,439 45,910,000 1.46%
9 ADOBE INC 442,398 45,545,000 1.45%
10 MICROCHIP TECHNOLOGY 681,853 43,741,000 1.40%
11 MEDTRONIC PLC 583,746 41,580,000 1.33%
12 APPLIED MATLS INC 1,280,553 41,323,000 1.32%
13 ALPHABET INC 52,181 40,274,000 1.28%
14 DEVON ENERGY CORP NEW 881,814 40,272,000 1.28%
15 PALO ALTO NETWORKS 298,848 37,371,000 1.19%
16 CME GROUP INC 289,723 33,420,000 1.07%
17 ULTA BEAUTY INC 131,046 33,409,000 1.07%
18 MORGAN STANLEY 779,714 32,943,000 1.05%
19 COACH INC 927,225 32,471,000 1.04%
20 DELPHI AUTOMOTIVE PLC 479,212 32,275,000 1.03%
21 MIDDLEBY CORP 244,620 31,510,000 1.01%
22 EDWARDS LIFESCIENCES CORP 325,383 30,488,000 0.97%
23 CONTINENTAL RESOURE 575,168 29,644,000 0.95%
24 BIOGEN INC 104,396 29,605,000 0.94%
25 AMAZON COM INC 38,160 28,615,000 0.91%
26 VISA INC 354,947 27,693,000 0.88%
27 FEDEX CORP 146,599 27,297,000 0.87%
28 DICKS SPORTING GOODS 501,629 26,636,000 0.85%
29 PARKER HANNIFIN CORP 189,231 26,492,000 0.84%
30 MOBILEYE N V AMSTELVEEN 676,585 25,791,000 0.82%
31 FACEBOOK INC 223,502 25,714,000 0.82%
32 JB HUNT TRANSPORT 251,333 24,397,000 0.78%
33 PANERA BREAD CO 117,403 24,078,000 0.77%
34 CBRE GROUP INC 737,314 23,218,000 0.74%
35 APPLE INC 198,817 23,027,000 0.73%
36 COSTCO WHSL CORP NEW 143,609 22,993,000 0.73%
37 VEEVA SYS INC 562,305 22,886,000 0.73%
38 RED HAT INC 325,880 22,714,000 0.72%
39 MICROSEMI CORP 404,605 21,837,000 0.70%
40 ELECTRONIC ARTS INC 242,375 19,089,000 0.61%
41 U S SILICA HLDGS INC COM 326,220 18,490,000 0.59%
42 MONSTER BEVERAGE COR 404,496 17,935,000 0.57%
43 ENTERPRISE PRODS PARTNERS L 618,670 16,729,000 0.53%
44 QUANTA SVCS INC 472,615 16,471,000 0.53%
45 SYNOVUS FINL CORP COM NEW 395,689 16,255,000 0.52%
46 MASTEC INC 414,835 15,867,000 0.51%
47 PDC ENERGY INC COM 213,225 15,476,000 0.49%
48 INTEGRA LIFESCIENCES HLDGS CP COM NEW 176,089 15,107,000 0.48%
49 PRA HEALTH SCIENCES INC 273,555 15,078,000 0.48%
50 NUVASIVE INC COM 221,905 14,948,000 0.48%
Page 1 of 8

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001106832-17-000001, filed 2017.02.15).

From 2023-01-03 onward, the SEC requires values to be reported in nearest dollars. Earlier filings reported values in thousands; therefore, positions shown as $0 in older filings may represent actual values between $0–$999.