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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
101 DAVE & BUSTERS ENTMT INC 202,681 8,460,000 0.25%
102 MGIC INVT CORP WIS 954,866 8,431,000 0.25%
103 PAYLOCITY HOLDING CORPORATION COM 207,893 8,430,000 0.25%
104 ICU MED INC 72,735 8,203,000 0.25%
105 Q2 Holdings Inc 307,746 8,115,000 0.24%
106 LYONDELLBASELL INDUSTRIES N 92,950 8,077,000 0.24%
107 INPHI CORPORATION 297,545 8,040,000 0.24%
108 BP PLC 256,980 8,033,000 0.24%
109 NXP SEMICONDUCTORS N V 95,100 8,012,000 0.24%
110 BOYD GAMING CORP COM 388,450 7,719,000 0.23%
111 SPS COMM INC 109,820 7,710,000 0.23%
112 CHUYS HLDGS INC COM 245,570 7,696,000 0.23%
113 CANTEL MEDICAL CORP 123,369 7,666,000 0.23%
114 POWERSECURE INTL INC 505,421 7,607,000 0.23%
115 CACI INTL INC CL A 81,800 7,589,000 0.23%
116 AMEDISYS INC COM 189,335 7,445,000 0.22%
117 MOTORCAR PTS AMER INC 217,506 7,354,000 0.22%
118 BLACKBAUD INC 111,018 7,312,000 0.22%
119 ATRICURE INC 321,215 7,208,000 0.22%
120 DYCOM INDS INC 101,420 7,095,000 0.21%
121 MONRO MUFFLER BRAKE INC 105,300 6,973,000 0.21%
122 PHILLIPS 66 84,955 6,949,000 0.21%
123 CABOT CORP 167,505 6,848,000 0.21%
124 EQT MIDSTREAM PARTNERS LP 90,710 6,845,000 0.21%
125 EQUIFAX INC 61,160 6,811,000 0.20%
126 GRACO INC 92,480 6,665,000 0.20%
127 CITIGROUPINC 128,710 6,661,000 0.20%
128 FERRO CORP 597,705 6,646,000 0.20%
129 BUCKEYE PARTNERS L P 99,485 6,562,000 0.20%
130 JOHN BEAN TECHNOLOGIES CORP COM 129,378 6,447,000 0.19%
131 D R HORTON INC 200,000 6,406,000 0.19%
132 BUILDERS FIRSTSOURCE 573,090 6,350,000 0.19%
133 WEBSITE PROS INC COM 312,502 6,253,000 0.19%
134 MONOLITHIC PWR SYS INC 98,095 6,250,000 0.19%
135 BARD C R INC 32,970 6,246,000 0.19%
136 JPMORGAN CHASE & CO 93,900 6,200,000 0.19%
137 NUVASIVE INC 113,565 6,145,000 0.18%
138 ENERGY TRANSFER PRTNRS L P 181,200 6,112,000 0.18%
139 FABRINET SHS 255,170 6,078,000 0.18%
140 CARRIZO OIL & GAS INC 205,445 6,077,000 0.18%
141 TESORO LOGISTICS LP 120,700 6,074,000 0.18%
142 STANDEX INTL CORP 70,044 5,824,000 0.18%
143 GTT COMMUNICATIONS INC COM 337,540 5,758,000 0.17%
144 INOGEN INC COM 143,352 5,747,000 0.17%
145 8X8 INC NEW COM 499,047 5,714,000 0.17%
146 TENNECO INC 121,430 5,575,000 0.17%
147 SELECT SECTOR SPDR TR 230,000 5,481,000 0.16%
148 CHANNELADVISOR CORP COM 395,687 5,480,000 0.16%
149 PEGASYSTEMS INC 198,700 5,464,000 0.16%
150 BENEFITFOCUS INC 147,850 5,380,000 0.16%
Page 3 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.