Ceased on March 22, 2022
Tier 1 Securities 
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 3,075 | 48,817,199 | 15,876 |
| 2020 | 3 | 3,267 | 53,929,745 | 16,507 |
| 2020 | 2 | 5,112 | 84,904,222 | 16,609 |
| 2020 | 1 | 6,626 | 109,944,562 | 16,593 |
| 2019 | 4 | 3,411 | 54,625,391 | 16,014 |
| 2019 | 3 | 4,044 | 62,022,793 | 15,337 |
| 2019 | 2 | 4,201 | 63,506,784 | 15,117 |
| 2019 | 1 | 4,925 | 80,620,260 | 16,370 |
| 2018 | 4 | 6,600 | 108,436,833 | 16,430 |
| 2018 | 3 | 5,336 | 90,759,177 | 17,009 |
| 2018 | 2 | 6,119 | 102,385,269 | 16,732 |
| 2018 | 1 | 5,709 | 88,801,205 | 15,555 |
| 2017 | 4 | 4,618 | 82,570,189 | 17,880 |
| 2017 | 3 | 4,399 | 75,835,691 | 17,239 |
| 2017 | 2 | 4,405 | 79,316,951 | 18,006 |
| 2017 | 1 | 4,091 | 75,172,877 | 18,375 |
| 2016 | 4 | 2,458 | 43,918,844 | 17,868 |
Tier 2 Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 1,338 | 18,352,419 | 13,716 |
| 2020 | 3 | 1,481 | 23,815,761 | 16,081 |
| 2020 | 2 | 2,105 | 33,262,833 | 15,802 |
| 2020 | 1 | 2,658 | 43,403,109 | 16,329 |
| 2019 | 4 | 1,679 | 26,358,023 | 15,699 |
| 2019 | 3 | 2,076 | 33,255,250 | 16,019 |
| 2019 | 2 | 2,111 | 32,193,719 | 15,250 |
| 2019 | 1 | 2,510 | 35,587,522 | 14,178 |
| 2018 | 4 | 3,193 | 50,885,445 | 15,937 |
| 2018 | 3 | 2,359 | 38,745,996 | 16,425 |
| 2018 | 2 | 2,648 | 40,238,382 | 15,196 |
| 2018 | 1 | 2,248 | 35,340,301 | 15,721 |
| 2017 | 4 | 1,851 | 31,296,672 | 16,908 |
| 2017 | 3 | 1,519 | 25,941,211 | 17,078 |
| 2017 | 2 | 1,796 | 29,836,302 | 16,613 |
| 2017 | 1 | 1,503 | 24,024,071 | 15,984 |
| 2016 | 4 | 918 | 15,522,472 | 16,909 |
NMS Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 4,413 | 67,169,618 | 15,221 |
| 2020 | 3 | 4,748 | 77,745,506 | 16,374 |
| 2020 | 2 | 7,217 | 118,167,055 | 16,373 |
| 2020 | 1 | 9,284 | 153,347,671 | 16,517 |
| 2019 | 4 | 5,090 | 80,983,414 | 15,910 |
| 2019 | 3 | 6,120 | 95,278,043 | 15,568 |
| 2019 | 2 | 6,312 | 95,700,503 | 15,162 |
| 2019 | 1 | 7,435 | 116,207,782 | 15,630 |
| 2018 | 4 | 9,793 | 159,322,278 | 16,269 |
| 2018 | 3 | 7,695 | 129,505,173 | 16,830 |
| 2018 | 2 | 8,767 | 142,623,651 | 16,268 |
| 2018 | 1 | 7,957 | 124,141,506 | 15,602 |
| 2017 | 4 | 6,469 | 113,866,861 | 17,602 |
| 2017 | 3 | 5,918 | 101,776,902 | 17,198 |
| 2017 | 2 | 6,201 | 109,153,253 | 17,603 |
| 2017 | 1 | 5,594 | 99,196,948 | 17,733 |
| 2016 | 4 | 3,376 | 59,441,316 | 17,607 |
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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