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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 (2014Q4)
Original 13F HR (0000932540-15-000002) filed in 2015.02.11
#
Name
Shares
Value ($)
%
Options
Notes
1 ZYNGA INC 415,200 1,104 0.02% Call
2 ZYNGA INC 328,082 873 0.01%
3 ZYNGA INC 623,300 1,658 0.03% Put
4 ZUMIEZ INC 489 19 0.00%
5 ZULILY INC 27,868 652 0.01%
6 ZULILY INC 50,900 1,191 0.02% Put
7 ZULILY INC 89,500 2,094 0.03% Call
8 ZOGENIX INC 71,900 99 0.00% Call
9 ZOGENIX INC 17,300 24 0.00% Put
10 ZOETIS INC 33,250 1,431 0.02%
11 ZOETIS INC 150,700 6,485 0.10% Put
12 ZOETIS INC 62,600 2,694 0.04% Call
13 ZOES KITCHEN INC 2,600 78 0.00% Put
14 ZOES KITCHEN INC 10,800 323 0.00% Call
15 ZIX CORP 5,600 20 0.00%
16 ZIX CORP 6,900 25 0.00% Call
17 ZIOPHARM ONCOLOGY INC 282,000 1,430 0.02% Put
18 ZIOPHARM ONCOLOGY INC 347,300 1,761 0.03% Call
19 ZIOPHARM ONCOLOGY INC 317,178 1,608 0.02%
20 ZION OIL & GAS INC 3,300 5 0.00% Call
21 ZION OIL & GAS INC 2,613 4 0.00%
22 ZHONE TECHNOLOGIES INC NEW 9,062 16 0.00%
23 ZHONE TECHNOLOGIES INC NEW 12,000 21 0.00% Call
24 ZHONE TECHNOLOGIES INC COMMON STOCK 9,200 16 0.00% Put
25 ZEP INC 100 2 0.00% Call
26 ZEP INC 5,063 77 0.00%
27 ZENDESK INC 3,300 80 0.00% Put
28 ZENDESK INC 215 5 0.00%
29 ZENDESK INC 500 12 0.00% Call
30 ZELTIQ AESTHETICS INC 33,326 930 0.01%
31 ZELTIQ AESTHETICS INC 95,400 2,663 0.04% Put
32 ZELTIQ AESTHETICS INC 2,700 75 0.00% Call
33 ZAZA ENERGY CORP 500 1 0.00% Put
34 ZAYO GROUP HOLDINGS 5,500 168 0.00%
35 ZAYO GROUP HLDGS INC 300 9 0.00% Put
36 ZAYO GROUP HLDGS INC 400 12 0.00% Call
37 ZAGG INCORPORATED 2,764 19 0.00%
38 ZAGG INC 3,800 26 0.00% Call
39 ZAGG INC 600 4 0.00% Put
40 YY INC 5,300 330 0.00% Call
41 YY INC 8,300 517 0.01% Put
42 YRC WORLDWIDE INC COM PAR .01 263,890 5,935 0.09%
43 YRC WORLDWIDE INC 31,800 715 0.01% Call
44 YRC WORLDWIDE INC 406,300 9,138 0.14% Put
45 YPF SOCIEDAD ANONIMA 502,200 13,293 0.20% Call
46 YPF SOCIEDAD ANONIMA 368,019 9,741 0.15%
47 YPF SOCIEDAD ANONIMA 946,800 25,062 0.38% Put
48 YOUKU TUDOU INC 176,500 3,143 0.05% Put
49 YOUKU TUDOU INC 61,200 1,090 0.02% Call
50 YOUKU TUDOU INC 82,327 1,466 0.02%
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