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 (2016Q1)
Original 13F HR (0000932540-16-000021) filed in 2016.05.12
#
Name
Shares
Value ($)
%
Options
Notes
1 FANG HOLDINGS LTD 190,707 1,142 0.02%
2 GOLDEN OCEAN GRP LTD 522 0 0.00%
3 GRAMMERCY PPTY TRUST 318 3 0.00%
4 Mosys Inc (MOSY) 11,500 7 0.00%
5 OSIRIS THERAPEUTICS INC 62,131 355 0.01%
6 UNIQURE NV SHS 14,000 166 0.00% Put
7 * AIRGAS INC COM 1,100 156 0.00%
8 * ATMEL CORP COM 43,874 356 0.01%
9 * JIAYUAN COM INTL LTD SPONSORED ADR 5,445 41 0.00%
10 * XUEDA ED GROUP SPONSORED ADR 1,400 8 0.00%
11 21VIANET GROUP INC 1,646,500 32,881 0.46% Put
12 21VIANET GROUP INC 731,500 14,608 0.21% Call
13 21VIANET GROUP INC SPONSORED ADR 1,474,439 29,445 0.42%
14 22ND CENTY GROUP INC 79,100 62 0.00% Put
15 22ND CENTY GROUP INCORPORATED 30,849 24 0.00%
16 2U INC 6,600 149 0.00% Call
17 2U INC 8,000 181 0.00% Put
18 3-D SYS CORP DEL 260,000 4,022 0.06% Put
19 3-D SYS CORP DEL 349,200 5,402 0.08% Call
20 500 COM LTD 228,000 3,808 0.05% Put
21 500 COM LTD 8,900 149 0.00% Call
22 500.com Limited 53,437 892 0.01%
23 58 COM INC 68,623 3,819 0.05%
24 58 COM INC 52,300 2,911 0.04% Call
25 58 COM INC 140,400 7,813 0.11% Put
26 8POINT3 ENERGY PARTNERS LP 2,000 29 0.00% Put
27 8POINT3 ENERGY PARTNERS LP 1,900 28 0.00% Call
28 8X8 INC NEW 1,000 10 0.00% Call
29 8X8 INC NEW 6,700 67 0.00% Put
30 8X8 INC NEW COM 4,597 46 0.00%
31 A10 NETWORKS INC 5,500 33 0.00% Call
32 AAC HLDGS INC 3,900 77 0.00% Put
33 AAC HLDGS INC 55,000 1,088 0.02% Call
34 AAR CORP 500 12 0.00% Put
35 AARONS INC 7,900 198 0.00% Call
36 AARONS INC 51,300 1,288 0.02% Put
37 ABB LTD 101,800 1,977 0.03% Put
38 ABB LTD 170,100 3,303 0.05% Call
39 ABBOTT LABS 9,200 385 0.01% Call
40 ABBOTT LABS 45,200 1,891 0.03% Put
41 ABBVIE INC 526,100 30,051 0.42% Put
42 ABBVIE INC 186,400 10,647 0.15% Call
43 ABBVIE INC 225,612 12,887 0.18%
44 ABENGOA YIELD PLC 1,100 20 0.00% Call
45 ABERCROMBIE & FITCH CO 15,210 480 0.01%
46 ABERCROMBIE & FITCH CO 28,400 896 0.01% Put
47 ABERCROMBIE & FITCH CO 1,400 44 0.00% Call
48 ABIOMED INC 5,000 474 0.01% Call
49 ABIOMED INC 6,500 616 0.01% Put
50 ABRAXAS PETE CORP 400 0 0.00% Put
Page 1 of 91