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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
101 AVG Technologies NV 381,208 8,291,000 0.27%
102 MEDIDATA SOLUTIONS INC 194,756 8,201,000 0.26%
103 WEBSITE PROS INC COM 387,447 8,167,000 0.26%
104 GULFPORT ENERGY CORP 272,935 8,101,000 0.26%
105 ICU MED INC 72,635 7,954,000 0.26%
106 Mueller Industries Inc 1,225,080 7,865,000 0.25%
107 ATRICURE INC 352,310 7,719,000 0.25%
108 Q2 Holdings Inc 307,446 7,600,000 0.24%
109 VALERO ENERGY CORP NEW 126,380 7,595,000 0.24%
110 NUTRI SYS INC NEW 285,155 7,562,000 0.24%
111 LDR HLDG CORP COM 217,068 7,495,000 0.24%
112 ELECTRONICS FOR IMAGING INC 173,051 7,490,000 0.24%
113 SPORTSMANS WAREHOUSE 605,325 7,458,000 0.24%
114 SPS COMM INC 109,620 7,442,000 0.24%
115 BUILDERS FIRSTSOURCE 581,400 7,372,000 0.24%
116 AMEDISYS INC COM 189,135 7,181,000 0.23%
117 GTT COMMUNICATIONS INC COM 307,540 7,153,000 0.23%
118 FISERV INC 82,464 7,142,000 0.23%
119 MONRO MUFFLER BRAKE INC 105,200 7,106,000 0.23%
120 MAGELLAN MIDSTREAM PRTNRS LP 117,380 7,056,000 0.23%
121 CHUYS HLDGS INC COM 245,370 6,969,000 0.22%
122 BIOGEN INC 23,005 6,713,000 0.22%
123 FERRO CORP 597,105 6,538,000 0.21%
124 PHILLIPS 66 84,955 6,528,000 0.21%
125 Nice Systems LTD Sponsored 115,303 6,495,000 0.21%
126 GREATBATCH INC 114,734 6,473,000 0.21%
127 BARD C R INC 34,570 6,441,000 0.21%
128 RED ROBIN GOURMET BURGERS INC COM 84,452 6,396,000 0.21%
129 EXLSERVICE HOLDINGS INC COM 172,927 6,386,000 0.21%
130 TILE SHOP HLDGS INC 530,232 6,352,000 0.20%
131 CHEGG INC COM 878,010 6,330,000 0.20%
132 SUMMIT MATLS INC CL A 336,905 6,324,000 0.20%
133 EQUIFAX INC 64,150 6,234,000 0.20%
134 PAYLOCITY HOLDING CORPORATION COM 207,693 6,229,000 0.20%
135 MONSTER BEVERAGE CORP NEW 45,415 6,137,000 0.20%
136 UNDER ARMOUR INC 62,540 6,053,000 0.19%
137 CAVIUM INC 98,335 6,035,000 0.19%
138 IMS HEALTH HLDS INC 207,255 6,031,000 0.19%
139 CAMBREX CORP 150,116 5,957,000 0.19%
140 D R HORTON INC 200,000 5,872,000 0.19%
141 DEPOMED INC 309,883 5,841,000 0.19%
142 CONCHO RESOURCES 59,240 5,823,000 0.19%
143 CHILDRENS PL INC 98,250 5,666,000 0.18%
144 PAYCOM SOFTWARE INC 157,752 5,665,000 0.18%
145 IXIA COM 390,155 5,653,000 0.18%
146 LYONDELLBASELL INDUSTRIES N 67,750 5,648,000 0.18%
147 MARTIN MARIETTA MATLS INC 36,820 5,595,000 0.18%
148 BOYD GAMING CORP COM 337,615 5,503,000 0.18%
149 Intersect ENT Inc 230,412 5,392,000 0.17%
150 BLOCK H & R INC 148,925 5,391,000 0.17%
Page 3 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.