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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 (2015Q2)
Portfolio Summary: 369 holdings with a total value of $3,743,406,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 C H ROBINSON WORLDWIDE INC 312,162 19,476,000 0.52%
52 LENNAR 371,500 18,961,000 0.51%
53 UNITEDHEALTH GROUP INC 151,190 18,445,000 0.49%
54 IMAX CORP 454,035 18,284,000 0.49%
55 MGIC INVT CORP WIS 1,594,650 18,147,000 0.48%
56 HUNT J B TRANS SVCS INC 218,480 17,935,000 0.48%
57 PENN ENTERTAINMENT INC COM 955,464 17,533,000 0.47%
58 ALERE INC 331,168 17,469,000 0.47%
59 JACK IN THE BOX INC 196,310 17,307,000 0.46%
60 WISDOMTREE INVTS INC 784,510 17,232,000 0.46%
61 UNION PAC CORP 175,690 16,756,000 0.45%
62 HELEN OF TROY CORP LTD 171,359 16,706,000 0.45%
63 VERINT SYS INC 270,250 16,416,000 0.44%
64 AMAG PHARMACEUTICALS INC 232,613 16,064,000 0.43%
65 XPO LOGISTICS INC 351,165 15,866,000 0.42%
66 BP PLC 387,880 15,500,000 0.41%
67 ADVISORY BRD CO COM 281,400 15,384,000 0.41%
68 ABIOMED INC 233,875 15,373,000 0.41%
69 J2 GLOBAL INC 224,992 15,286,000 0.41%
70 ZEBRA TECHNOLOGIES CORPORATION CL A 137,070 15,222,000 0.41%
71 HSN Inc 215,105 15,098,000 0.40%
72 TOYOTA MOTOR CORP 112,300 15,020,000 0.40%
73 BERRY PLASTICS GROUP INC 458,850 14,867,000 0.40%
74 CORELOGIC INC 373,750 14,834,000 0.40%
75 MEDTRONIC PLC 198,361 14,699,000 0.39%
76 RINGCENTRAL INC 785,832 14,530,000 0.39%
77 COMSCORE INC 271,036 14,435,000 0.39%
78 NUANCE COMM 821,650 14,387,000 0.38%
79 MASONITE INTL CORP NEW COM 204,825 14,360,000 0.38%
80 HEALTH NET INC 218,111 13,985,000 0.37%
81 SS&C TECHNOLOGIES HLDGS INC 222,450 13,903,000 0.37%
82 STANDARD PAC CORP 1,559,725 13,897,000 0.37%
83 TYLER TECHNOLOGIES INC 106,152 13,734,000 0.37%
84 WENDYS CO 1,213,625 13,690,000 0.37%
85 ENTERPRISE PRODS PARTNERS L 447,070 13,363,000 0.36%
86 MENS WEARHOUSE INC 207,730 13,309,000 0.36%
87 PACWEST BANCORP DEL COM 282,286 13,200,000 0.35%
88 AMN HEALTHCARE SERVICES INC 414,625 13,098,000 0.35%
89 BROOKDALE SR LIVING INC 377,439 13,097,000 0.35%
90 CVS HEALTH CORP 123,600 12,963,000 0.35%
91 CIENA CORP 539,225 12,769,000 0.34%
92 INFOBLOX INC 486,375 12,748,000 0.34%
93 ACUITY BRANDS INC 69,815 12,565,000 0.34%
94 Q2 Holdings Inc 440,850 12,454,000 0.33%
95 DELUXE CORP COM 200,075 12,405,000 0.33%
96 Nice Systems LTD Sponsored 189,875 12,074,000 0.32%
97 VALERO ENERGY CORP NEW 192,580 12,056,000 0.32%
98 ClubCorp Hldgs Inc 496,950 11,867,000 0.32%
99 ENERGY TRANSFER PRTNRS L P 226,230 11,809,000 0.32%
100 INOGEN INC COM 260,834 11,633,000 0.31%
Page 2 of 8

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001106832-15-000003, filed 2015.08.17).

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.