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SEC Rule 606

SEC Rule 606 Report - Seaport Securities Corporation - 2nd Qtr, 2018

(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 48.37 15.68 35.95
Citadel Securities 33.66 43.14 6.15 32.89
VIRTU Americas LLC 33.17 41.40 13.85 30.54
New York Stock Exchange 7.12 0.00 1.54 19.13
DirectEdge ECN (EDGX) 6.39 0.00 30.77 4.36
Two Sigma Securities, LLC 4.10 4.74 0.77 4.70
Inet ATS, Inc. 3.98 0.00 25.38 0.00
Nasdaq Execution Services 2.90 0.00 17.69 0.34
G1 Execution Services 1.81 2.99 0.77 0.67
SEAP 1.81 0.00 0.00 5.03
INCI 1.45 2.99 0.00 0.00
BATS Y Exchange 1.21 2.49 0.00 0.00
UBS Securities LLC 0.60 0.50 0.77 0.67
Instinet Corp 0.48 1.00 0.00 0.00
VIRTU Americas LLC 0.48 0.50 0.00 0.67
BATS Stock Exchange 0.36 0.00 2.31 0.00
BNY MELLON CAPITAL MARKET 0.24 0.25 0.00 0.34
National Financial Servic 0.12 0.00 0.00 0.34
Bats Y Exchange 0.12 0.00 0.00 0.34


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
829 401 130 298 0 48.37 15.68 35.95
279 173 8 98 0 62.01 2.87 35.13
275 166 18 91 0 60.36 6.55 33.09
59 0 2 57 0 0.00 3.39 96.61
53 0 40 13 0 0.00 75.47 24.53
34 19 1 14 0 55.88 2.94 41.18
33 0 33 0 0 0.00 100.00 0.00
24 0 23 1 0 0.00 95.83 4.17
15 12 1 2 0 80.00 6.67 13.33
15 0 0 15 0 0.00 0.00 100.00
12 12 0 0 0 100.00 0.00 0.00
10 10 0 0 0 100.00 0.00 0.00
5 2 1 2 0 40.00 20.00 40.00
4 4 0 0 0 100.00 0.00 0.00
4 2 0 2 0 50.00 0.00 50.00
3 0 3 0 0 0.00 100.00 0.00
2 1 0 1 0 50.00 0.00 50.00
1 0 0 1 0 0.00 0.00 100.00
1 0 0 1 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 29.96 22.57 47.47
Citadel Securities 26.95 43.38 9.70 24.78
VIRTU Americas LLC 25.85 41.10 9.09 24.21
Nasdaq Execution Services 16.55 0.00 15.76 27.38
DirectEdge ECN (EDGX) 10.53 0.00 40.00 3.17
SKNY 5.61 0.00 1.21 11.24
Inet ATS, Inc. 4.65 0.00 19.39 0.58
G1 Execution Services 2.46 5.02 1.21 1.44
Two Sigma Securities, LLC 2.19 4.11 0.00 2.02
UBS Securities LLC 1.23 0.00 0.00 2.59
BATS Stock Exchange 0.96 0.00 3.64 0.29
BATS Y Exchange 0.82 2.28 0.00 0.29
INCI 0.82 2.74 0.00 0.00
SEAP 0.82 0.00 0.00 1.73
Instinet Corp 0.41 1.37 0.00 0.00
BNY MELLON CAPITAL MARKET 0.14 0.00 0.00 0.29


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
731 219 165 347 0 29.96 22.57 47.47
197 95 16 86 0 48.22 8.12 43.65
189 90 15 84 0 47.62 7.94 44.44
121 0 26 95 0 0.00 21.49 78.51
77 0 66 11 0 0.00 85.71 14.29
41 0 2 39 0 0.00 4.88 95.12
34 0 32 2 0 0.00 94.12 5.88
18 11 2 5 0 61.11 11.11 27.78
16 9 0 7 0 56.25 0.00 43.75
9 0 0 9 0 0.00 0.00 100.00
7 0 6 1 0 0.00 85.71 14.29
6 5 0 1 0 83.33 0.00 16.67
6 6 0 0 0 100.00 0.00 0.00
6 0 0 6 0 0.00 0.00 100.00
3 3 0 0 0 100.00 0.00 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 38.18 40.00 21.82
Citadel Securities 32.73 52.38 22.73 16.67
VIRTU Americas LLC 18.18 21.43 15.91 16.67
Inet ATS, Inc. 11.82 0.00 27.27 4.17
Nasdaq Execution Services 7.27 0.00 18.18 0.00
G1 Execution Services 6.36 9.52 0.00 12.50
Two Sigma Securities, LLC 6.36 9.52 0.00 12.50
NYSE MKT 4.55 0.00 2.27 16.67
DirectEdge ECN (EDGX) 4.55 0.00 9.09 4.17
BATS Stock Exchange 1.82 0.00 2.27 4.17
VIRTU Americas LLC 1.82 0.00 0.00 8.33
Archipelago LLC 0.91 0.00 2.27 0.00
BNY MELLON CAPITAL MARKET 0.91 2.38 0.00 0.00
BATS Y Exchange 0.91 2.38 0.00 0.00
Instinet Corp 0.91 2.38 0.00 0.00
National Financial Servic 0.91 0.00 0.00 4.17


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
110 42 44 24 0 38.18 40.00 21.82
36 22 10 4 0 61.11 27.78 11.11
20 9 7 4 0 45.00 35.00 20.00
13 0 12 1 0 0.00 92.31 7.69
8 0 8 0 0 0.00 100.00 0.00
7 4 0 3 0 57.14 0.00 42.86
7 4 0 3 0 57.14 0.00 42.86
5 0 1 4 0 0.00 20.00 80.00
5 0 4 1 0 0.00 80.00 20.00
2 0 1 1 0 0.00 50.00 50.00
2 0 0 2 0 0.00 0.00 100.00
1 0 1 0 0 0.00 100.00 0.00
1 1 0 0 0 100.00 0.00 0.00
1 1 0 0 0 100.00 0.00 0.00
1 1 0 0 0 100.00 0.00 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 8.20 91.80 0.00
Nasdaq Option Market 22.95 0.00 25.00 0.00
ISEG 18.03 0.00 19.64 0.00
Citadel Securities 11.48 0.00 12.50 0.00
Philadelphia Exch 9.84 80.00 3.57 0.00
Archipelago LLC 8.20 0.00 8.93 0.00
BATS Stock Exchange 6.56 0.00 7.14 0.00
CITI 6.56 0.00 7.14 0.00
Morgan Stanley & Co 6.56 0.00 7.14 0.00
Chicago Board Options Exchange 3.28 0.00 3.57 0.00
DirectEdge ECN (EDGX) 3.28 0.00 3.57 0.00
Citadel Execution Service 1.64 0.00 1.79 0.00
MIAX Options Exchange 1.64 20.00 0.00 0.00


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
61 5 56 0 0 8.20 91.80 0.00
14 0 14 0 0 0.00 100.00 0.00
11 0 11 0 0 0.00 100.00 0.00
7 0 7 0 0 0.00 100.00 0.00
6 4 2 0 0 66.67 33.33 0.00
5 0 5 0 0 0.00 100.00 0.00
4 0 4 0 0 0.00 100.00 0.00
4 0 4 0 0 0.00 100.00 0.00
4 0 4 0 0 0.00 100.00 0.00
2 0 2 0 0 0.00 100.00 0.00
2 0 2 0 0 0.00 100.00 0.00
1 0 1 0 0 0.00 100.00 0.00
1 1 0 0 0 100.00 0.00 0.00



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

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