Ceased on April 1, 2016
Tier 1 Securities 
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2015 | 3 | 108,590 | 31,062,561 | 286 |
| 2015 | 2 | 107,183 | 31,351,135 | 293 |
| 2015 | 1 | 28,551 | 9,715,543 | 340 |
| 2014 | 4 | 35,059 | 10,877,686 | 310 |
| 2014 | 3 | 25,334 | 6,469,713 | 255 |
| 2014 | 2 | 3,737 | 897,200 | 240 |
Tier 2 Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2015 | 3 | 50,031 | 18,331,694 | 366 |
| 2015 | 2 | 57,412 | 16,647,057 | 290 |
| 2015 | 1 | 22,593 | 7,743,244 | 343 |
| 2014 | 4 | 31,311 | 9,900,144 | 316 |
| 2014 | 3 | 21,717 | 4,647,402 | 214 |
| 2014 | 2 | 4,686 | 984,049 | 210 |
NMS Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2015 | 3 | 158,621 | 49,394,255 | 311 |
| 2015 | 2 | 164,595 | 47,998,192 | 292 |
| 2015 | 1 | 51,144 | 17,458,787 | 341 |
| 2014 | 4 | 66,370 | 20,777,830 | 313 |
| 2014 | 3 | 47,051 | 11,117,115 | 236 |
| 2014 | 2 | 8,423 | 1,881,249 | 223 |
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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