formerly known as PDQ ATS
See also: PDQM PDQX
Tier 1 Securities 
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 785,134 | 93,969,417 | 120 |
| 2020 | 3 | 973,725 | 161,531,443 | 166 |
| 2020 | 2 | 1,253,309 | 245,005,502 | 195 |
| 2020 | 1 | 1,262,817 | 272,233,030 | 216 |
| 2019 | 4 | 1,033,706 | 216,572,330 | 210 |
| 2019 | 3 | 996,396 | 207,831,655 | 209 |
| 2019 | 2 | 947,582 | 204,460,678 | 216 |
| 2019 | 1 | 880,792 | 200,764,246 | 228 |
| 2018 | 4 | 598,573 | 143,048,018 | 239 |
Tier 2 Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 1,246,762 | 235,347,410 | 189 |
| 2020 | 3 | 1,341,959 | 293,955,864 | 219 |
| 2020 | 2 | 1,266,132 | 272,281,714 | 215 |
| 2020 | 1 | 1,161,073 | 238,505,055 | 205 |
| 2019 | 4 | 932,673 | 185,444,108 | 199 |
| 2019 | 3 | 883,106 | 163,282,824 | 185 |
| 2019 | 2 | 807,823 | 145,910,862 | 181 |
| 2019 | 1 | 664,408 | 124,238,006 | 187 |
| 2018 | 4 | 479,563 | 87,582,401 | 183 |
NMS Securities
| Year | Q | Total Trades | Total Shares | Avg Trade Size |
|---|---|---|---|---|
| 2020 | 4 | 2,031,896 | 329,316,827 | 162 |
| 2020 | 3 | 2,315,684 | 455,487,307 | 197 |
| 2020 | 2 | 2,519,441 | 517,287,216 | 205 |
| 2020 | 1 | 2,423,890 | 510,738,085 | 211 |
| 2019 | 4 | 1,966,379 | 402,016,438 | 204 |
| 2019 | 3 | 1,879,502 | 371,114,479 | 197 |
| 2019 | 2 | 1,755,405 | 350,371,540 | 200 |
| 2019 | 1 | 1,545,200 | 325,002,252 | 210 |
| 2018 | 4 | 1,078,136 | 230,630,419 | 214 |
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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