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ARDSLEY ADVISORY PARTNERS Information

262 HARBOR DRIVE, 4TH FLOOR, STAMFORD, Connecticut, 06902, (203) 564-4230

Report Date: 03/31/2013

Position Statistics:

Total Positions 184
New Positions 72
Increased Positions 92
Decreased Positions 87
Positions with Activity 179
Sold Out Positions 57
Total Mkt Value
(in $ millions)		 544

Sector Weighting

Basic Materials 8.07%
Capital Goods 9.81%
Conglomerates 0.58%
Consumer Cyclical 6.77%
Consumer/Non-Cyclical 0.19%
Energy 11.87%
Financial 5.79%
Healthcare 21.3%
Services 15.2%
Technology 18.14%
Transportation 0%
Utilities 1.3%

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

184 Positions as of 03/31/2013

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held
UNITED RENTALS INC COM 32,441 -8,879 (21.49) 628,100
JAZZ PHARMACEUTICALS PLC SHS USD 31,145 10,769 52.86 447,100
PFIZER INC COM 29,609 -379 (1.27) 1,007,100
ACTAVIS INC COM 28,967 -1,948 (6.3) 230,500
LINN ENERGY LLC UNIT LTD LIAB 24,956 24,956 New 790,000
LYONDELLBASELL INDUSTRIES N V SHS - A - 20,457 846 4.32 297,300
SABA SOFTWARE INC COM NEW 18,048 3,298 22.36 2,055,600
ANADARKO PETE CORP COM 16,808 -4,942 (22.72) 193,200
PIONEER NAT RES CO COM 13,919 13,919 New 90,000
MICHAEL KORS HLDGS LTD SHS 13,682 13,682 New 222,000
TESLA MTRS INC COM 13,224 13,224 New 127,900
SPDR GOLD TRUST GOLD SHS 13,173 13,173 New 99,700
NETEASE INC SPONSORED ADR 11,406 11,406 New 182,700
RIVERBED TECHNOLOGY INC COM 10,386 10,386 New 631,000
ELLIE MAE INC COM 9,855 1,123 12.86 395,000
HOLOGIC INC COM 9,805 757 8.37 466,000
TRIPADVISOR INC COM 9,578 9,578 New 150,000
SENSATA TECHNOLOGIES HLDG BV A SHS 9,418 -2,615 (21.73) 262,200
U S G CORP COM NEW 9,012 2,464 37.64 344,100
ENERSYS COM 8,838 8,838 New 173,800