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SEC Rule 606

SEC Rule 606 Report - Seaport Securities Corporation - 1st Qtr, 2019

(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 37.15 26.01 36.84
Citadel Securities 36.32 52.38 9.20 39.27
VIRTU Americas LLC 14.26 18.21 4.80 16.95
G1 Execution Services 11.24 19.89 3.20 8.19
DirectEdge ECN (EDGX) 10.51 0.00 36.00 3.11
New York Stock Exchange 6.87 0.00 6.00 14.41
Nasdaq Execution Services 4.89 0.00 18.00 0.56
SEAP 4.06 0.00 0.00 11.02
Inet ATS, Inc. 3.85 0.00 14.00 0.56
Two Sigma Securities, LLC 3.12 4.76 1.60 2.54
National Financial Servic 2.71 2.52 3.20 2.54


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
961 357 250 354 0 37.15 26.01 36.84
349 187 23 139 0 53.58 6.59 39.83
137 65 12 60 0 47.45 8.76 43.80
108 71 8 29 0 65.74 7.41 26.85
101 0 90 11 0 0.00 89.11 10.89
66 0 15 51 0 0.00 22.73 77.27
47 0 45 2 0 0.00 95.74 4.26
39 0 0 39 0 0.00 0.00 100.00
37 0 35 2 0 0.00 94.59 5.41
30 17 4 9 0 56.67 13.33 30.00
26 9 8 9 0 34.62 30.77 34.62



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 31.03 26.14 42.83
Citadel Securities 34.40 53.26 11.61 34.65
VIRTU Americas LLC 11.97 14.13 3.23 15.75
G1 Execution Services 10.96 19.02 3.23 9.84
DirectEdge ECN (EDGX) 10.62 0.00 40.00 0.39
Nasdaq Execution Services 10.62 0.00 15.48 15.35
SKNY 4.55 0.00 0.65 10.24
Two Sigma Securities, LLC 4.55 7.07 0.65 5.12
Inet ATS, Inc. 3.71 0.00 14.19 0.00
National Financial Servic 3.37 4.35 1.29 3.94
BATS Stock Exchange 2.70 0.00 9.03 0.79


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
593 184 155 254 0 31.03 26.14 42.83
204 98 18 88 0 48.04 8.82 43.14
71 26 5 40 0 36.62 7.04 56.34
65 35 5 25 0 53.85 7.69 38.46
63 0 62 1 0 0.00 98.41 1.59
63 0 24 39 0 0.00 38.10 61.90
27 0 1 26 0 0.00 3.70 96.30
27 13 1 13 0 48.15 3.70 48.15
22 0 22 0 0 0.00 100.00 0.00
20 8 2 10 0 40.00 10.00 50.00
16 0 14 2 0 0.00 87.50 12.50



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

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 37.00 54.00 9.00
Citadel Securities 32.00 59.46 12.96 33.33
BATS Stock Exchange 15.00 0.00 27.78 0.00
VIRTU Americas LLC 13.00 21.62 3.70 33.33
G1 Execution Services 11.00 10.81 12.96 0.00
Inet ATS, Inc. 9.00 0.00 16.67 0.00
Nasdaq Execution Services 7.00 0.00 12.96 0.00
DirectEdge ECN (EDGX) 5.00 0.00 9.26 0.00
Two Sigma Securities, LLC 5.00 8.11 0.00 22.22
NYSE MKT 2.00 0.00 1.85 11.11
National Financial Servic 1.00 0.00 1.85 0.00


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
100 37 54 9 0 37.00 54.00 9.00
32 22 7 3 0 68.75 21.88 9.38
15 0 15 0 0 0.00 100.00 0.00
13 8 2 3 0 61.54 15.38 23.08
11 4 7 0 0 36.36 63.64 0.00
9 0 9 0 0 0.00 100.00 0.00
7 0 7 0 0 0.00 100.00 0.00
5 0 5 0 0 0.00 100.00 0.00
5 3 0 2 0 60.00 0.00 40.00
2 0 1 1 0 0.00 50.00 50.00
1 0 1 0 0 0.00 100.00 0.00



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

Publicly Posted Percentages
Route Venues Total (%) Market (%) Limit (%) Other (%)
Total 100.00 8.33 91.67 0.00
Nasdaq Option Market 16.67 0.00 18.18 0.00
Citadel Securities 11.90 0.00 12.99 0.00
Morgan Stanley & Co 10.71 0.00 11.69 0.00
CITI 9.52 0.00 10.39 0.00
Chicago Board Options Exchange 8.33 57.14 3.90 0.00
DirectEdge ECN (EDGX) 8.33 0.00 9.09 0.00
Archipelago LLC 7.14 0.00 7.79 0.00
ISEG 5.95 0.00 6.49 0.00
National Financial Servic 4.76 0.00 5.19 0.00
BATS Stock Exchange 3.57 14.29 2.60 0.00
Boston Options Exchange 3.57 14.29 2.60 0.00


Private Supporting Data
Total (#) Market (#) Limit (#) Other (#) *Unknown (#) Market (%) Limit (%) Other (%)
84 7 77 0 0 8.33 91.67 0.00
14 0 14 0 0 0.00 100.00 0.00
10 0 10 0 0 0.00 100.00 0.00
9 0 9 0 0 0.00 100.00 0.00
8 0 8 0 0 0.00 100.00 0.00
7 4 3 0 0 57.14 42.86 0.00
7 0 7 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 1 2 0 0 33.33 66.67 0.00
3 1 2 0 0 33.33 66.67 0.00



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

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