Dark
Light
System
Institutional Investment Manager
GROUP ONE TRADING LLC
GROUP ONE TRADING LLC (CIK: 0000932540) incorporated in Delaware, located at 425 S Financial Place, Chicago, IL. Institutional holdings reported to the SEC.

Institutional Holdings (2015Q2)
Portfolio Summary: 4,849 holdings with a total value of $7,147,569,000.
#
Name
Shares
Value ($)
%
Options
Notes
4801 TITAN MACHY INC 100 1,000 0.00% Call
4802 TRANSATLANTIC PETROLEUM LTD 100 1,000 0.00% Call
4803 CGG 100 1,000 0.00% Call
4804 CHECKPOINT SYS INC 100 1,000 0.00% Put
4805 W T OFFSHORE INC 135 1,000 0.00%
4806 LOUISIANA PAC CORP 4 0 0.00%
4807 NYMOX PHARMACEUTICAL CORP 300 0 0.00% Call
4808 SUNGY MOBILE LTD 3 0 0.00%
4809 SMART TECHNOLOGIES INC 1 0 0.00%
4810 DRDGOLD LIMITED 100 0 0.00%
4811 PACIFIC BIOSCIENCES CALIF IN 22 0 0.00%
4812 TOWERSTREAM CORP 135 0 0.00%
4813 FIVE STAR SENIOR LIVING INC 100 0 0.00% Put
4814 TAL ED GROUP 1 0 0.00%
4815 GOLAR LNG PARTNERS LP 9 0 0.00%
4816 URANIUM RES INC 300 0 0.00% Call
4817 PARAGON OFFSHORE PLC 200 0 0.00% Put
4818 BOINGO WIRELESS INC COM 1 0 0.00%
4819 NANOSPHERE INC 76 0 0.00%
4820 NEOGENOMICS INC 22 0 0.00%
4821 STR Holdings Inc 3 0 0.00%
4822 MATTSON TECHNOLOGY INC 100 0 0.00% Put
4823 FX ENERGY INC 200 0 0.00% Call
4824 KEY ENERGY SVCS INC 200 0 0.00% Put
4825 MARATHON OIL CORP 9 0 0.00%
4826 VONAGE HLDGS CORP 100 0 0.00% Call
4827 IMPAC MTG HLDGS INC COM NEW 1 0 0.00%
4828 STRATA SKIN SCIENCES INC COM 1 0 0.00%
4829 OCEANEERING INTL INC 7 0 0.00%
4830 MARTIN MIDSTREAM PRTNRS L P 7 0 0.00%
4831 NORTH ATLANTIC DRILLING LTD 200 0 0.00% Call
4832 DRAGONWAVE INC 97 0 0.00%
4833 GREAT PANTHER SILVER LTD 59 0 0.00%
4834 DEX MEDIA INC NEW 100 0 0.00% Call
4835 TORONTO DOMINION BK ONT 1 0 0.00%
4836 SAFE BULKERS INC 100 0 0.00% Put
4837 NORTHERN DYNASTY MINERALS LTD COM 900 0 0.00%
4838 IMMUNOCELLULAR THERAPEUTICS 300 0 0.00% Put
4839 ROYALE ENERGY INC 81 0 0.00%
4840 NOVATEL WIRELESS INC 100 0 0.00% Put
4841 ALEXCO RESOURCE CORP 22 0 0.00%
4842 UQM TECHNOLOGIES INC COM 261 0 0.00%
4843 RIGEL PHARMACEUTICALS INC 100 0 0.00% Call
4844 WARREN RES INC 400 0 0.00% Call
4845 SAMSON OIL & GAS LTD 100 0 0.00% Call
4846 ENERGY RECOVERY INC 100 0 0.00% Put
4847 GENETIC TECHNOLOGIES LTD 100 0 0.00% Put
4848 ASSEMBLY BIOSCIENCES INC 1 0 0.00%
4849 HARVEST NATURAL RESOURCES IN 100 0 0.00% Put
Page 97 of 97

Portfolio data is normalized using SEC Form 13F filings, including the Original 13F-HR (0000932540-15-000009, filed 2015.08.11).

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.