GROUP ONE TRADING, L.P. Information

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

Report Date: 03/31/2014

Position Statistics

Total Positions 1,918
New Positions 468
Increased Positions 924
Decreased Positions 968
Positions with Activity 1,892
Sold Out Positions 492
Total Mkt Value (in $ millions) 967

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

Sector Weighting

Basic Materials 4.87%
Capital Goods 1.29%
Conglomerates 0.59%
Consumer Cyclical 2.49%
Consumer/Non-Cyclical 1.66%
Energy 13.97%
Financial 6.77%
Healthcare 14.16%
Services 21.73%
Technology 20.35%
Transportation 3.54%
Utilities 4.68%

1,918 Positions as of 03/31/2014

Company Class Value of Shares ($1,000s) Change in Value ($1,000s) Change (%) Shares Held ▲
3-D SYS CORP DEL COM NEW -2,978 Sold Out 0
3M CO COM -29 Sold Out 0
58 COM INC SPON ADR REP A -421 Sold Out 0
AASTROM BIOSCIENCES INC COM PAR$ Sold Out 0
ABBVIE INC COM -4,103 Sold Out 0
AEGON N V NY REGISTRY SH -15 Sold Out 0
AES CORP COM -7 Sold Out 0
AG MTG INVT TR INC COM -31 Sold Out 0
AIRCASTLE LTD COM -32 Sold Out 0
ALAMOS GOLD INC COM -6 Sold Out 0
ALASKA AIR GROUP INC COM -27 Sold Out 0
ALBEMARLE CORP COM -21 Sold Out 0
ALCOA INC COM -9 Sold Out 0
ALERE INC COM -471 Sold Out 0
ALIGN TECHNOLOGY INC COM -828 Sold Out 0
ALLISON TRANSMISSION HLDGS INC COM -40 Sold Out 0
ALLSCRIPTS HEALTHCARE SOLUTNS COM -111 Sold Out 0
ALON USA PARTNERS LP UT LTDPART INT -360 Sold Out 0
ALTISOURCE PORTFOLIO SOLNS SA REG SHS -445 Sold Out 0
ALUMINA LTD SPONSORED ADR -9 Sold Out 0