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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 ENVISION HEALTHCARE HLDGS INC 144,750 5,325,000 0.17%
152 NEWELL BRANDS 133,050 5,283,000 0.17%
153 SUPERNUS PHARMACEUTICALS INC 374,387 5,253,000 0.17%
154 SEALED AIR CORP NEW 111,315 5,218,000 0.17%
155 SELECT SECTOR SPDR TR 230,000 5,212,000 0.17%
156 SPECTRUM BRANDS HLDGS INC 56,370 5,158,000 0.17%
157 BP PLC 164,680 5,033,000 0.16%
158 CHEVRON CORP NEW 63,355 4,997,000 0.16%
159 K2M GROUP HLDGS INC COM 266,456 4,956,000 0.16%
160 INSTALLED BLDG PRODS INC COM 195,598 4,945,000 0.16%
161 SIGNATURE BANK 35,255 4,850,000 0.16%
162 HEXCEL CORP NEW COM 105,676 4,741,000 0.15%
163 MARKWEST ENERGY PARTNERS LP 110,050 4,722,000 0.15%
164 E TRADE FINANCIAL CORP 177,450 4,672,000 0.15%
165 HOLOGIC INC 119,350 4,670,000 0.15%
166 VONAGE HLDGS CORP 790,375 4,647,000 0.15%
167 BROADRIDGE FINL SOLUTIONS IN 82,670 4,576,000 0.15%
168 VERISIGN INC 64,605 4,559,000 0.15%
169 ISHARES TR 200,000 4,538,000 0.15%
170 JARDEN CORP 92,680 4,530,000 0.15%
171 KINDER MORGAN INC DEL 162,700 4,504,000 0.14%
172 Plains Gp Hldgs Lp Npv A 256,600 4,491,000 0.14%
173 SCHLUMBERGER LTD 65,000 4,483,000 0.14%
174 INPHI CORPORATION 185,695 4,464,000 0.14%
175 GIGAMON INC 222,075 4,444,000 0.14%
176 GLOBAL PMTS INC 38,575 4,426,000 0.14%
177 MASCO CORP 173,275 4,363,000 0.14%
178 INTUITIVE SURGICAL INC 9,490 4,361,000 0.14%
179 LABORATORY CORP AMER HLDGS 39,475 4,282,000 0.14%
180 RESTAURANT BRANDS INTL INC 117,802 4,231,000 0.14%
181 BAKER HUGHES INC 80,800 4,205,000 0.14%
182 WHITEWAVE FOODS CO 104,380 4,191,000 0.13%
183 GALLAGHER ARTHUR J & CO 101,500 4,190,000 0.13%
184 FIDELITY NATIONAL FINANCIAL 117,695 4,175,000 0.13%
185 STERICYCLE INC 29,770 4,147,000 0.13%
186 IAC INTERACTIVECORP 63,325 4,133,000 0.13%
187 8X8 INC NEW COM 498,547 4,123,000 0.13%
188 COMFORT SYS USA INC 151,085 4,119,000 0.13%
189 POWERSECURE INTL INC 355,461 4,095,000 0.13%
190 LKQ CORP 144,295 4,092,000 0.13%
191 WESTROCK CO 79,170 4,073,000 0.13%
192 CANTEL MEDICAL CORP 69,809 3,958,000 0.13%
193 WESTERN GAS PARTNERS LP 82,785 3,876,000 0.12%
194 SUMITOMO MITSUI FINL GROUP I 505,000 3,853,000 0.12%
195 ACUITY BRANDS INC 21,940 3,852,000 0.12%
196 ALLEGION PUB LTD CO 66,600 3,840,000 0.12%
197 TESORO LOGISTICS LP 85,300 3,839,000 0.12%
198 2U, Inc. 106,835 3,835,000 0.12%
199 UNIVERSAL HLTH SVCS INC 30,725 3,835,000 0.12%
200 ENBRIDGE INC 102,620 3,810,000 0.12%
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.