Core terms
Off-exchange (TRF) print
A trade executed away from the exchanges, for example by a wholesaler, an alternative trading system (dark pool) or another broker-dealer, and reported afterwards to a FINRA facility. On the consolidated feed for Nasdaq-listed stocks it carries market center code D.
Off-exchange trades in NMS stocks are reported to a FINRA Trade Reporting Facility (TRF) or the Alternative Display Facility. FINRA Rule 6380A requires reporting as soon as practicable and no later than 10 seconds after execution (as of 2026-10-05), so a print can appear seconds after it happened; late reports carry condition codes. Code D says the trade was reported off-exchange; it does not name the wholesaler, the ATS or the customer.
Most off-exchange volume comes from wholesalers filling retail marketable orders, not from dark pools in the strict sense. In June 2026 the SEC described off-exchange trading as regularly exceeding half of overall US stock volume (Release No. 34-105655; as of 2026-10-05).
Rule 612 limits the increments of quotes, not trades, so wholesaler price improvement and midpoint executions produce sub-penny prints such as $3.5875 (Illustrative).
What traders should verify
Read a large off-exchange print by its size against the stock's normal minute volume, its location against the quote and whether it repeats. Log it as a print, not as "institutional buying".
Do not conflate
The print shows that a trade happened, with price, size and time. It does not show which side started it, whether it was one piece of a larger order, or whether it was a hedge. FINRA's published ATS volume arrives weeks later and describes past volume, not current intent.
Primary source
Primary sourceFINRA Rule 6380A