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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
101 JOHN BEAN TECHNOLOGIES CORP COM 116,588 10,021,000 0.32%
102 CRYOLIFE INC 521,825 9,993,000 0.32%
103 ON SEMICONDUCTOR CORP 763,830 9,746,000 0.31%
104 SPDR SERIES TRUST 286,600 9,701,000 0.31%
105 WESCO INTL INC 145,050 9,653,000 0.31%
106 WILLIAMS PARTNERS L P NEW 251,830 9,577,000 0.31%
107 Wright Medical Group NV 410,870 9,442,000 0.30%
108 MEDIDATA SOLUTIONS INC 190,040 9,439,000 0.30%
109 DEVRY EDUCATION 299,335 9,339,000 0.30%
110 ZELTIQ AESTHETICS INC 214,560 9,338,000 0.30%
111 VANDA PHARMACEUTICALS INC COM 583,960 9,314,000 0.30%
112 CHENIERE ENERGY INC 224,250 9,291,000 0.30%
113 SUNCOR ENERGY INC NEW 283,850 9,279,000 0.30%
114 EAGLE PHARMACEUTICALS INC COM 116,520 9,245,000 0.29%
115 CYRUSONE INC 202,330 9,050,000 0.29%
116 WAGEWORKS INC COM 124,258 9,009,000 0.29%
117 DORMAN PRODUCTS INC 121,525 8,879,000 0.28%
118 Acxiom Corp 327,385 8,774,000 0.28%
119 EXXON MOBIL CORP 96,910 8,747,000 0.28%
120 ENCANA CORP 742,750 8,720,000 0.28%
121 Del Taco Restaurants, Inc. 617,490 8,719,000 0.28%
122 BAKER HUGHES INC 133,900 8,699,000 0.28%
123 CARDIOVASCULAR SYS INC DEL COM 358,785 8,686,000 0.28%
124 DEERE & CO 84,143 8,670,000 0.28%
125 ICON PLC 115,280 8,669,000 0.28%
126 GRANITE CONSTR INC 155,520 8,554,000 0.27%
127 ROYAL DUTCH SHELL PLC 154,930 8,425,000 0.27%
128 8X8 INC NEW COM 586,096 8,381,000 0.27%
129 WIX COM LTD 187,960 8,374,000 0.27%
130 SUPERNUS PHARMACEUTICALS INC 330,541 8,346,000 0.27%
131 SOUTHWESTERN ENERGY CO 769,800 8,329,000 0.27%
132 NEOGENOMICS INC 971,332 8,324,000 0.27%
133 UNIVAR INC 291,525 8,271,000 0.26%
134 FAIRMOUNT SANTROL HLDGS INC 700,725 8,262,000 0.26%
135 PNC FINL SVCS GROUP INC 70,600 8,257,000 0.26%
136 DSW INC CL A 359,715 8,148,000 0.26%
137 ICU MED INC 55,055 8,112,000 0.26%
138 FINANCIAL ENGINES INC 219,705 8,074,000 0.26%
139 PRIMERICA INC 115,627 7,996,000 0.26%
140 DIGITALGLOBE INC 276,980 7,935,000 0.25%
141 SKECHERS U S A INC 320,410 7,876,000 0.25%
142 INPHI CORPORATION 175,555 7,833,000 0.25%
143 ENERGEN CORP COM 134,960 7,783,000 0.25%
144 INTERXION HOLDING N.V 221,182 7,757,000 0.25%
145 JPMORGAN CHASE & CO 88,400 7,628,000 0.24%
146 RBC BEARINGS INC 82,145 7,624,000 0.24%
147 MAGELLAN MIDSTREAM PRTNRS LP 97,880 7,403,000 0.24%
148 FIVE9 INC 520,209 7,382,000 0.24%
149 ISHARES TR 127,500 7,361,000 0.23%
150 MARATHON PETE CORP 145,345 7,318,000 0.23%
Page 3 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.