Ceased on April 30, 2019
Tier 1 Securities 
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2019 | 2 | 531,986 | 104,798,554 | 197 |
| 2019 | 1 | 1,660,808 | 348,256,643 | 210 |
| 2018 | 4 | 2,178,979 | 457,053,266 | 210 |
| 2018 | 3 | 1,714,800 | 377,083,885 | 220 |
| 2018 | 2 | 1,766,930 | 369,949,002 | 209 |
| 2018 | 1 | 1,803,175 | 384,647,292 | 213 |
| 2017 | 4 | 1,677,814 | 369,808,026 | 220 |
| 2017 | 3 | 1,680,831 | 358,722,413 | 213 |
| 2017 | 2 | 1,565,519 | 377,746,034 | 241 |
| 2017 | 1 | 1,464,533 | 358,430,404 | 245 |
| 2016 | 4 | 1,683,524 | 380,123,843 | 226 |
| 2016 | 3 | 1,434,596 | 316,812,339 | 221 |
| 2016 | 2 | 1,625,586 | 401,219,220 | 247 |
| 2016 | 1 | 1,973,084 | 476,121,106 | 241 |
| 2015 | 4 | 2,042,227 | 470,507,908 | 230 |
| 2015 | 3 | 2,449,221 | 513,347,245 | 210 |
| 2015 | 2 | 1,759,333 | 366,306,868 | 208 |
| 2015 | 1 | 2,176,858 | 386,149,804 | 177 |
| 2014 | 4 | 1,978,292 | 367,983,660 | 186 |
| 2014 | 3 | 2,299,616 | 485,712,810 | 211 |
| 2014 | 2 | 1,821,301 | 367,377,462 | 202 |
Tier 2 Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2019 | 2 | 315,663 | 56,428,831 | 179 |
| 2019 | 1 | 1,202,224 | 220,669,478 | 184 |
| 2018 | 4 | 1,535,416 | 282,573,071 | 184 |
| 2018 | 3 | 1,230,954 | 242,330,517 | 197 |
| 2018 | 2 | 1,174,378 | 231,535,749 | 197 |
| 2018 | 1 | 1,269,252 | 237,590,945 | 187 |
| 2017 | 4 | 1,115,151 | 223,050,084 | 200 |
| 2017 | 3 | 1,147,426 | 222,437,332 | 194 |
| 2017 | 2 | 1,020,791 | 208,534,634 | 204 |
| 2017 | 1 | 893,664 | 190,855,418 | 214 |
| 2016 | 4 | 843,698 | 173,524,843 | 206 |
| 2016 | 3 | 829,175 | 163,358,996 | 197 |
| 2016 | 2 | 943,805 | 220,831,357 | 234 |
| 2016 | 1 | 1,140,534 | 293,924,618 | 258 |
| 2015 | 4 | 1,352,217 | 336,826,605 | 249 |
| 2015 | 3 | 1,593,481 | 391,595,388 | 246 |
| 2015 | 2 | 1,312,010 | 322,466,664 | 246 |
| 2015 | 1 | 1,307,962 | 295,723,700 | 226 |
| 2014 | 4 | 1,327,602 | 280,055,919 | 211 |
| 2014 | 3 | 1,525,383 | 322,089,422 | 211 |
| 2014 | 2 | 1,203,716 | 232,085,824 | 193 |
NMS Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2019 | 2 | 847,649 | 161,227,385 | 190 |
| 2019 | 1 | 2,863,032 | 568,926,121 | 199 |
| 2018 | 4 | 3,714,395 | 739,626,337 | 199 |
| 2018 | 3 | 2,945,754 | 619,414,402 | 210 |
| 2018 | 2 | 2,941,308 | 601,484,751 | 204 |
| 2018 | 1 | 3,072,427 | 622,238,237 | 203 |
| 2017 | 4 | 2,792,965 | 592,858,110 | 212 |
| 2017 | 3 | 2,828,257 | 581,159,745 | 205 |
| 2017 | 2 | 2,586,310 | 586,280,668 | 227 |
| 2017 | 1 | 2,358,197 | 549,285,822 | 233 |
| 2016 | 4 | 2,527,222 | 553,648,686 | 219 |
| 2016 | 3 | 2,263,771 | 480,171,335 | 212 |
| 2016 | 2 | 2,569,391 | 622,050,577 | 242 |
| 2016 | 1 | 3,113,618 | 770,045,724 | 247 |
| 2015 | 4 | 3,394,444 | 807,334,513 | 238 |
| 2015 | 3 | 4,042,702 | 904,942,633 | 224 |
| 2015 | 2 | 3,071,343 | 688,773,532 | 224 |
| 2015 | 1 | 3,484,820 | 681,873,504 | 196 |
| 2014 | 4 | 3,305,894 | 648,039,579 | 196 |
| 2014 | 3 | 3,824,999 | 807,802,232 | 211 |
| 2014 | 2 | 3,025,017 | 599,463,286 | 198 |
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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