Ceased on September 30, 2018
Tier 1 Securities 
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2018 | 3 | 456 | 22,503,609 | 49,350 |
| 2018 | 2 | 1,306 | 63,130,553 | 48,339 |
| 2018 | 1 | 1,246 | 74,473,400 | 59,770 |
| 2017 | 4 | 366 | 46,397,572 | 126,769 |
| 2017 | 3 | 80 | 10,735,521 | 134,194 |
Tier 2 Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2018 | 3 | 42 | 1,697,248 | 40,411 |
| 2018 | 2 | 217 | 13,700,876 | 63,138 |
| 2018 | 1 | 252 | 14,439,591 | 57,300 |
| 2017 | 4 | 94 | 5,452,983 | 58,010 |
| 2017 | 3 | 24 | 894,608 | 37,275 |
NMS Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2018 | 3 | 498 | 24,200,857 | 48,596 |
| 2018 | 2 | 1,523 | 76,831,429 | 50,447 |
| 2018 | 1 | 1,498 | 88,912,991 | 59,354 |
| 2017 | 4 | 460 | 51,850,555 | 112,719 |
| 2017 | 3 | 104 | 11,630,129 | 111,828 |
Original Source of Information: FINRA ATS Transparency Data Quarterly Statistics
ATS data has been aggregated on a quarterly basis to display total shares, total trades and average trade size per ATS.
Tier 1 comprises all securities in the S&P 500, the Russell 1000 and select Exchange Traded Products (ETPs). Tier 2 comprises all other NMS securities, except for rights and warrants, which are specifically excluded from coverage. The LULD Plan applies during regular trading hours of 9:30 am ET – 4:00 pm ET, excepting opening, reopening, and closing transactions on the primary listing exchanges.
See Limitup-limit-down for a more detailed explanation of these categories.
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