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SEC Rule 606

EC Rule 606 Report - Seaport Securities Corporation - 3rd Qtr, 2017

(Percentages of Total Non-Directed Orders Routed to Individual Route Venues)

Securities Listed on New York Stock Exchange Euronext

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 41.20 30.21 28.59
Citadel Securities 25.37 37.01 9.22 25.64
VIRTU Americas LLC 24.78 40.93 11.65 15.38
New York Stock Exch 12.32 0.00 4.37 38.46
BATS Stock Exchange 9.97 0.00 33.01 0.00
DirectEdge ECN (EDGX) 9.38 0.00 31.07 0.00
Instinet Corp 3.08 7.12 0.49 0.00
Two Sigma Securities, LLC 3.08 5.69 1.46 1.03
G1 Execution Services 2.93 4.63 0.49 3.08
National Financial Servic 2.64 0.00 5.83 3.08
VIRTU Americas LLC 1.91 0.00 0.00 6.67


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
682 281 206 195 0 41.20 30.21 28.59
173 104 19 50 0 60.12 10.98 28.90
169 115 24 30 0 68.05 14.20 17.75
84 0 9 75 0 0.00 10.71 89.29
68 0 68 0 0 0.00 100.00 0.00
64 0 64 0 0 0.00 100.00 0.00
21 20 1 0 0 95.24 4.76 0.00
21 16 3 2 0 76.19 14.29 9.52
20 13 1 6 0 65.00 5.00 30.00
18 0 12 6 0 0.00 66.67 33.33
13 0 0 13 0 0.00 0.00 100.00



100.00% of total customer orders were non-directed orders.

Securities Listed on The Nasdaq Stock Market

Securities Listed on NYSE MKT or other National Securities Exchange

Exchange-Listed Options

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 33.47 26.69 39.84
VIRTU Americas LLC 31.08 43.45 9.70 35.00
Citadel Securities 28.09 32.14 6.72 39.00
DirectEdge ECN (EDGX) 10.36 0.00 38.81 0.00
BATS Stock Exchange 6.37 0.00 22.39 1.00
Two Sigma Securities, LLC 4.98 11.31 0.75 2.50
Nasdaq Execution Services 4.78 0.00 11.19 4.50
G1 Execution Services 3.19 4.17 1.49 3.50
National Financial Servic 2.99 1.19 7.46 1.50
Instinet Corp 1.99 5.95 0.00 0.00
BATS Y Exchange 1.59 1.19 0.00 3.00


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
502 168 134 200 0 33.47 26.69 39.84
156 73 13 70 0 46.79 8.33 44.87
141 54 9 78 0 38.30 6.38 55.32
52 0 52 0 0 0.00 100.00 0.00
32 0 30 2 0 0.00 93.75 6.25
25 19 1 5 0 76.00 4.00 20.00
24 0 15 9 0 0.00 62.50 37.50
16 7 2 7 0 43.75 12.50 43.75
15 2 10 3 0 13.33 66.67 20.00
10 10 0 0 0 100.00 0.00 0.00
8 2 0 6 0 25.00 0.00 75.00



100.00% of total customer orders were non-directed orders.

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 66.27 16.87 16.87
Citadel Securities 37.35 43.64 14.29 35.71
VIRTU Americas LLC 26.51 32.73 21.43 7.14
National Financial Servic 10.84 5.45 42.86 0.00
Two Sigma Securities, LLC 7.23 9.09 0.00 7.14
BATS Y Exchange 4.82 5.45 0.00 7.14
G1 Execution Services 4.82 3.64 7.14 7.14
Archipelago LLC 2.41 0.00 0.00 14.29
NYSE MKT 1.20 0.00 0.00 7.14
BATS Stock Exchange 1.20 0.00 7.14 0.00
BNY MELLON CAPITAL MARKET 1.20 0.00 0.00 7.14


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
83 55 14 14 0 66.27 16.87 16.87
31 24 2 5 0 77.42 6.45 16.13
22 18 3 1 0 81.82 13.64 4.55
9 3 6 0 0 33.33 66.67 0.00
6 5 0 1 0 83.33 0.00 16.67
4 3 0 1 0 75.00 0.00 25.00
4 2 1 1 0 50.00 25.00 25.00
2 0 0 2 0 0.00 0.00 100.00
1 0 0 1 0 0.00 0.00 100.00
1 0 1 0 0 0.00 100.00 0.00
1 0 0 1 0 0.00 0.00 100.00



100.00% of total customer orders were non-directed orders.

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 7.25 92.75 0.00
Citadel Securities 18.84 0.00 20.31 0.00
Morgan Stanley & Co 15.94 0.00 17.19 0.00
ISEG 13.04 0.00 14.06 0.00
Nasdaq Option Market 13.04 0.00 14.06 0.00
CITI 8.70 0.00 9.38 0.00
BATS Stock Exchange 7.25 0.00 7.81 0.00
National Financial Servic 5.80 0.00 6.25 0.00
Archipelago LLC 4.35 0.00 4.69 0.00
Chicago Board OptionsExch 4.35 40.00 1.56 0.00
Philadelphia Exch 4.35 40.00 1.56 0.00


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
69 5 64 0 0 7.25 92.75 0.00
13 0 13 0 0 0.00 100.00 0.00
11 0 11 0 0 0.00 100.00 0.00
9 0 9 0 0 0.00 100.00 0.00
9 0 9 0 0 0.00 100.00 0.00
6 0 6 0 0 0.00 100.00 0.00
5 0 5 0 0 0.00 100.00 0.00
4 0 4 0 0 0.00 100.00 0.00
3 0 3 0 0 0.00 100.00 0.00
3 2 1 0 0 66.67 33.33 0.00
3 2 1 0 0 66.67 33.33 0.00



100.00% of total customer orders were non-directed orders.

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