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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 (2016Q1)
Portfolio Summary: 367 holdings with a total value of $3,202,024,000.
#
Name
Shares
Value ($)
%
Options
Notes
51 POST HLDGS INC 227,372 15,636,000 0.49%
52 U S SILICA HLDGS INC 653,925 14,857,000 0.46%
53 COGENT COMMUNICATIONS HLDGS IN COM NEW 366,459 14,303,000 0.45%
54 HEICO CORP NEW 235,958 14,188,000 0.44%
55 VCA INCORPORATED 245,320 14,153,000 0.44%
56 CRITEO S A 340,735 14,113,000 0.44%
57 LITTELFUSE INC 114,555 14,103,000 0.44%
58 CommVault Systems Inc 308,557 13,320,000 0.42%
59 VISTEON CORP COM NEW 167,224 13,309,000 0.42%
60 APTARGROUP INC 167,314 13,119,000 0.41%
61 BERRY PLASTICS GROUP INC 361,785 13,079,000 0.41%
62 WEST PHARMACEUTICAL SVSC INC 188,100 13,039,000 0.41%
63 SS&C TECHNOLOGIES HLDGS INC 205,549 13,036,000 0.41%
64 TREEHOUSE FOODS INC 146,945 12,747,000 0.40%
65 FAIR ISAAC CORP 118,859 12,610,000 0.39%
66 TENNECO INC 242,500 12,491,000 0.39%
67 PANERA BREAD CO 60,742 12,442,000 0.39%
68 BWX TECHNOLOGIES INC COM 357,165 11,986,000 0.37%
69 ENERGIZER HLDGS INC NEW COM 291,745 11,819,000 0.37%
70 HOLOGIC INC 341,480 11,781,000 0.37%
71 MICROSEMI CORP 306,725 11,751,000 0.37%
72 SALLY BEAUTY HLDGS INC 357,515 11,576,000 0.36%
73 ENERGY TRANSFER PRTNRS L P 348,255 11,263,000 0.35%
74 A O SMITH 139,268 10,628,000 0.33%
75 DUPONT FABROS TECHNOLOGY INC 261,963 10,617,000 0.33%
76 BRUKER CORP 378,555 10,600,000 0.33%
77 SYNOVUS FINL CORP 363,559 10,510,000 0.33%
78 HELEN OF TROY CORP LTD 100,726 10,444,000 0.33%
79 ST JUDE MED INC 189,145 10,403,000 0.32%
80 EURONET WORLDWIDE INC 139,968 10,373,000 0.32%
81 ACADIA COMPANY COM 186,401 10,273,000 0.32%
82 EVERCORE PARTNERS INC 192,956 9,985,000 0.31%
83 POWERSHARES QQQ TRUST 91,000 9,937,000 0.31%
84 PENNEY J C 892,850 9,875,000 0.31%
85 INPHI CORPORATION 289,645 9,657,000 0.30%
86 EXLSERVICE HOLDINGS INC COM 186,127 9,641,000 0.30%
87 CANTEL MEDICAL CORP 131,099 9,355,000 0.29%
88 CHICOS FAS INC 684,405 9,082,000 0.28%
89 SCHLUMBERGER LTD 122,800 9,057,000 0.28%
90 MYRIAD GENETICS INC 241,414 9,036,000 0.28%
91 MAGELLAN MIDSTREAM PRTNRS LP 130,560 8,983,000 0.28%
92 LENNAR 185,750 8,983,000 0.28%
93 AMEDISYS INC COM 184,365 8,912,000 0.28%
94 GRANITE CONSTR INC 182,925 8,744,000 0.27%
95 COLFAX CORP 302,825 8,658,000 0.27%
96 DOW CHEM CO 169,700 8,631,000 0.27%
97 ENERGEN CORP COM 235,700 8,624,000 0.27%
98 CACI INTL INC CL A 79,650 8,499,000 0.27%
99 CARRIZO OIL & GAS INC 273,129 8,445,000 0.26%
100 PENN ENTERTAINMENT INC COM 502,160 8,381,000 0.26%
Page 2 of 8

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001106832-16-000006, filed 2016.05.17).

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.