CASTLEARK MANAGEMENT LLC Information

1 N WACKER DR, CHICAGO, Illinois, 60606, (312) 456-9682

Report Date: 03/31/2013

Position Statistics:

Total Positions 334
New Positions 39
Increased Positions 97
Decreased Positions 151
Positions with Activity 248
Sold Out Positions 48
Total Mkt Value
(in $ millions)
3,058

Sector Weighting

Basic Materials 6.83%
Capital Goods 6.08%
Conglomerates 0.11%
Consumer Cyclical 6.22%
Consumer/Non-Cyclical 2.21%
Energy 17%
Financial 11.42%
Healthcare 6.82%
Services 15.64%
Technology 17.35%
Transportation 8.87%
Utilities 1.43%

Institutional Holdings information is filed by major institutions on form 13-F with the Securities and Exchange Commission.

97 INCREASED Positions as of 03/31/2013

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
SANTARUS INC COM 4,075 4,075 New 188,150
RADIAN GROUP INC COM 3,829 3,829 New 300,775
FIESTA RESTAURANT GROUP INC COM 3,799 3,799 New 107,975
EMERITUS CORP COM 3,779 221 6.22 154,200
KORN FERRY INTL COM NEW 3,735 3,735 New 216,275
CAI INTERNATIONAL INC COM 3,653 3,653 New 138,300
PDF SOLUTIONS INC COM 3,631 451 14.19 204,225
CYNOSURE INC CL A 3,625 748 26.01 154,171
CARDIOVASCULAR SYS INC DEL COM 3,446 3,446 New 158,125
DIGITALGLOBE INC COM NEW 3,339 600 21.90 110,500
SYNCHRONOSS TECHNOLOGIES INC COM 3,314 3,314 New 104,975
BRUKER CORP COM 3,275 3,275 New 200,200
CHINA PETE & CHEM CORP SPON ADR H SHS 3,149 1,225 63.64 34,200
WABASH NATL CORP COM 3,131 440 16.34 319,515
FREESCALE SEMICONDUCTOR LTD SHS 3,094 3,094 New 206,850
RPX CORP COM 2,954 2,954 New 187,775
QLIK TECHNOLOGIES INC COM 2,861 2,861 New 97,150
RTI INTL METALS INC COM 2,845 1,129 65.79 99,225
SEMGROUP CORP CL A 2,828 452 19.05 52,500
SILICON GRAPHICS INTL CORP COM 2,810 2,810 New 202,125

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