TIRX off-exchange (ATS) volume, week by week
Alternative trading systems, often called dark pools, report every trade to FINRA, which publishes each stock’s weekly totals after a delay. These are those totals: shares traded and number of trades, each week with the day FINRA first published it. Exchange volume is not included, and no share of total volume is given, because we have no consolidated volume figure that counts the same trades.
FINRA lists a stock for a week only when an alternative trading system reported trades in it, under the symbol FINRA uses. A share class written with a dot, or a stock that is not an NMS or OTC equity, can be listed under another symbol or not at all.
FINRA is the owner and source of this off-exchange (ATS) weekly volume data. Free on every plan; not for redistribution.