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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 (2015Q3)
Portfolio Summary: 364 holdings with a total value of $3,107,572,000.
#
Name
Shares
Value ($)
%
Options
Notes
151 FORTINET INC 81,525 3,463,000 0.11%
152 HD SUPPLY HLDGS INCORPORATED 121,420 3,475,000 0.11%
153 ISHARES TR 124,800 3,482,000 0.11%
154 CARLISLE COS INC 40,275 3,519,000 0.11%
155 ENDO INTL PLC 50,850 3,523,000 0.11%
156 JETBLUE AIRWAYS CORP 136,826 3,526,000 0.11%
157 PNC FINL SVCS GROUP INC 40,000 3,568,000 0.11%
158 EQT CORP 55,300 3,582,000 0.12%
159 RETROPHIN INC 178,034 3,607,000 0.12%
160 HARMAN INTL INDS INC 37,875 3,636,000 0.12%
161 ENI S P A 117,500 3,686,000 0.12%
162 DARDEN RESTAURANTS INC 54,375 3,727,000 0.12%
163 HOLLYFRONTIER CORP 77,500 3,785,000 0.12%
164 TOLL BROTHERS INC 111,200 3,807,000 0.12%
165 ENBRIDGE INC 102,620 3,810,000 0.12%
166 UNIVERSAL HLTH SVCS INC 30,725 3,835,000 0.12%
167 2U, Inc. 106,835 3,835,000 0.12%
168 TESORO LOGISTICS LP 85,300 3,839,000 0.12%
169 ALLEGION PUB LTD CO 66,600 3,840,000 0.12%
170 ACUITY BRANDS INC 21,940 3,852,000 0.12%
171 SUMITOMO MITSUI FINL GROUP I 505,000 3,853,000 0.12%
172 WESTERN GAS PARTNERS LP 82,785 3,876,000 0.12%
173 CANTEL MEDICAL CORP 69,809 3,958,000 0.13%
174 WESTROCK CO 79,170 4,073,000 0.13%
175 LKQ CORP 144,295 4,092,000 0.13%
176 POWERSECURE INTL INC 355,461 4,095,000 0.13%
177 COMFORT SYS USA INC 151,085 4,119,000 0.13%
178 8X8 INC NEW COM 498,547 4,123,000 0.13%
179 IAC INTERACTIVECORP 63,325 4,133,000 0.13%
180 STERICYCLE INC 29,770 4,147,000 0.13%
181 FIDELITY NATIONAL FINANCIAL 117,695 4,175,000 0.13%
182 GALLAGHER ARTHUR J & CO 101,500 4,190,000 0.13%
183 WHITEWAVE FOODS CO 104,380 4,191,000 0.13%
184 BAKER HUGHES INC 80,800 4,205,000 0.14%
185 RESTAURANT BRANDS INTL INC 117,802 4,231,000 0.14%
186 LABORATORY CORP AMER HLDGS 39,475 4,282,000 0.14%
187 INTUITIVE SURGICAL INC 9,490 4,361,000 0.14%
188 MASCO CORP 173,275 4,363,000 0.14%
189 GLOBAL PMTS INC 38,575 4,426,000 0.14%
190 GIGAMON INC 222,075 4,444,000 0.14%
191 INPHI CORPORATION 185,695 4,464,000 0.14%
192 SCHLUMBERGER LTD 65,000 4,483,000 0.14%
193 Plains Gp Hldgs Lp Npv A 256,600 4,491,000 0.14%
194 KINDER MORGAN INC DEL 162,700 4,504,000 0.14%
195 JARDEN CORP 92,680 4,530,000 0.15%
196 ISHARES TR 200,000 4,538,000 0.15%
197 VERISIGN INC 64,605 4,559,000 0.15%
198 BROADRIDGE FINL SOLUTIONS IN 82,670 4,576,000 0.15%
199 VONAGE HLDGS CORP 790,375 4,647,000 0.15%
200 HOLOGIC INC 119,350 4,670,000 0.15%
Page 4 of 8

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001106832-15-000004, filed 2015.11.17).

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.