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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 (2015Q4)
Portfolio Summary: 387 holdings with a total value of $3,327,543,000.
#
Name
Shares
Value ($)
%
Options
Notes
201 PNC FINL SVCS GROUP INC 40,000 3,812,000 0.11%
202 TOLL BROTHERS INC 111,200 3,703,000 0.11%
203 BANK AMER CORP 220,000 3,703,000 0.11%
204 GENESIS ENERGY LP COM UNITS NPV 100,300 3,685,000 0.11%
205 NAVIGANT CONSULTING INC 226,335 3,635,000 0.11%
206 MPLX LP 92,214 3,627,000 0.11%
207 IAC INTERACTIVECORP 60,335 3,623,000 0.11%
208 LEAR CORP 29,475 3,620,000 0.11%
209 ACUITY BRANDS INC 15,090 3,528,000 0.11%
210 XYLEM INC 96,620 3,527,000 0.11%
211 TRIMBLE INC 164,080 3,520,000 0.11%
212 TOTAL SYS SVCS INC 70,345 3,503,000 0.11%
213 TRIMAS CORP COM NEW 187,575 3,498,000 0.11%
214 SUPERNUS PHARMACEUTICALS INC 259,272 3,485,000 0.10%
215 DEXCOM INC 42,510 3,482,000 0.10%
216 HD SUPPLY HLDGS INCORPORATED 115,660 3,473,000 0.10%
217 OWENS CORNING NEW 73,210 3,443,000 0.10%
218 WESTROCK CO 75,390 3,439,000 0.10%
219 BOOZ ALLEN HAMILTON HLDG COR 111,080 3,427,000 0.10%
220 HARMAN INTL INDS INC 36,075 3,399,000 0.10%
221 ISHARES TR 124,800 3,393,000 0.10%
222 TALLGRASS ENERGY PAR 82,236 3,389,000 0.10%
223 VERTEX PHARMACEUTICALS INC 26,830 3,376,000 0.10%
224 HARRIS CORP 38,220 3,321,000 0.10%
225 SHELL MIDSTREAM PARTNERS L P 79,730 3,310,000 0.10%
226 SUNCOR ENERGY INC NEW 122,890 3,171,000 0.10%
227 LENNOX INTL INC 25,170 3,144,000 0.09%
228 CONCHO RESOURCES 33,740 3,133,000 0.09%
229 STERICYCLE INC 25,890 3,122,000 0.09%
230 SUNOCO LOGISTICS PRTNRS L P 120,440 3,095,000 0.09%
231 PHILLIPS 66 PARTNERS LP 49,740 3,054,000 0.09%
232 LIONS GATE ENTERTN 91,970 2,979,000 0.09%
233 SPDR GOLD TR 28,500 2,892,000 0.09%
234 EQT CORP 55,300 2,883,000 0.09%
235 Nomura Holdings Inc 518,100 2,875,000 0.09%
236 ISHARES TR 28,600 2,845,000 0.09%
237 CYPRESS SEMICONDUCTOR CORP 288,385 2,829,000 0.09%
238 VANTIV INC 59,270 2,811,000 0.08%
239 WR GRACE & CO 27,750 2,764,000 0.08%
240 CADENCE DESIGN SYSTEM INC 132,640 2,760,000 0.08%
241 ADVANCE AUTO PARTS INC 18,280 2,751,000 0.08%
242 SPECTRUM BRANDS HLDGS INC 25,670 2,613,000 0.08%
243 WHITEWAVE FOODS CO 66,320 2,581,000 0.08%
244 VIPER ENERGY PARTNERS LP COM UNT RP INT 180,100 2,514,000 0.08%
245 ON SEMICONDUCTOR CORP 254,690 2,496,000 0.08%
246 TESORO CORP 23,300 2,455,000 0.07%
247 WILLIAMS PARTNERS L P NEW 86,600 2,412,000 0.07%
248 JETBLUE AIRWAYS CORP 105,526 2,390,000 0.07%
249 ROYAL DUTCH SHELL PLC 51,960 2,379,000 0.07%
250 ALKERMES PLC 29,430 2,336,000 0.07%
Page 5 of 8

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0001106832-16-000005, filed 2016.02.17).

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.