GROUP ONE TRADING, L.P. Information

440 S. LASALLE STREET, CHICAGO, Illinois, 60605, (312) 347-8864

Report Date: 12/31/2013

Position Statistics

Total Positions 1,866
New Positions 491
Increased Positions 1,006
Decreased Positions 832
Positions with Activity 1,838
Sold Out Positions 408
Total Mkt Value (in $ millions) 905

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

Sector Weighting

Basic Materials 4.53%
Capital Goods 2.13%
Conglomerates 1.03%
Consumer Cyclical 2.68%
Consumer/Non-Cyclical 1.81%
Energy 15.12%
Financial 9.69%
Healthcare 13.61%
Services 21.24%
Technology 21.02%
Transportation 2.36%
Utilities 3.41%

1,866 Positions as of 12/31/2013

Company Class Value of Shares ($1,000s) ▼ Change in Value ($1,000s) Change (%) Shares Held
KELLOGG CO COM 15 15 New 229
BOINGO WIRELESS INC COM 15 3 27.78 2,300
MALLINCKRODT PUB LTD CO SHS 15 -9 (37.5) 250
TREX CO INC COM 15 -1 (5.24) 199
TENNECO INC COM 15 15 New 249
ADECOAGRO S A COM 15 -64 (81.09) 1,656
HIBBETT SPORTS INC COM 15 (0.36) 279
OMNOVA SOLUTIONS INC COM 15 -8 (36.47) 1,568
BABCOCK & WILCOX CO NEW COM 15 15 New 431
ENSCO PLC SHS CLASS A 14 14 New 290
NXSTAGE MEDICAL INC COM 14 6 73.42 1,181
AXCELIS TECHNOLOGIES INC COM 14 9 155.62 7,431
SUCAMPO PHARMACEUTICALS INC CL A 14 3 23.03 2,137
NORWEGIAN CRUISE LINE HLDGS LT SHS 14 14 New 469
NORTH EUROPEAN OIL RTY TR SH BEN INT 14 14 New 599
HAIN CELESTIAL GROUP INC COM 14 14 New 163
DESARROLLADORA HOMEX S A DE CV SPONSORED ADR 14 -5 (28.05) 8,980
NANOVIRICIDES INC COM NEW 14 14 New 4,070
CELESTICA INC SUB VTG SHS 14 2 18.18 1,300
PIKE CORP COM 14 14 New 1,347