Dark Pool Print
// trade reported to the FINRA TRF after executing on an off-exchange ATS
A dark pool print is an off-exchange equity trade that executed on an Alternative Trading System (ATS) and was reported to the FINRA Trade Reporting Facility (TRF). The print appears on the consolidated tape but the venue routing is opaque pre-trade.
- Dark pools are SEC-registered Alternative Trading Systems regulated under Reg ATS. Trades execute off-exchange but post to FINRA TRF in real time after execution.
- Large block prints (typically 10,000+ shares or $200,000+ notional) often hit dark pools to minimize market impact. The print posts on the tape but with the venue masked.
- Tape readers infer institutional positioning from dark prints, but the inference is fuzzy. A single large print does not always mean directed institutional buying or selling.
How it is calculated
Dark pool prints carry a venue code that identifies the TRF rather than a lit exchange. Some tape-reading systems infer trade direction from the print price relative to the National Best Bid and Offer (NBBO) at the moment of execution. A print at or above the ask is "buy-leaning"; at or below the bid is "sell-leaning"; at the mid is a neutral cross. This direction inference is approximate; the actual side is not disclosed.
What traders use it for
- Spotting institutional accumulation or distribution. Large repeated buy-leaning prints in a single name on a low-news day can signal accumulation.
- Confirming or fading thesis. A bullish thesis that prints alongside large bid-leaning dark trades is a contradiction; reconcile or adjust.
- Cross-checking options flow. Big dark prints alongside unusual call-side volume often precede a multi-day move; the two surfaces together are stronger than either alone.
Worked example
On a quiet session, AAPL prints six TRF blocks of 50,000+ shares between 10:00 and 11:00 ET, all within $0.02 of the offer. NBBO at the time of each print was $185.42 / $185.43. The aggregate $50M of buy-leaning dark prints on a low-news day is the kind of print pattern tape readers flag as institutional accumulation. As of 2026-05-02 11:00 ET. The inference is suggestive, not conclusive; the actual side is not disclosed.
Live data: /stocks/AAPL.
Common pitfalls
- Side is inferred, not reported. A print at the ask can still be a sale (e.g., a buy-side firm hitting an internalizer's offer). The inference works in aggregate; one print can be wrong.
- Not every TRF print is a dark pool print. The TRF aggregates many off-exchange categories, including internalization by retail brokers. A "dark print" indicator that conflates internalized retail flow with institutional ATS activity overstates the institutional signal.
- Late prints distort the read. A trade that executed at 10:00 but printed at 14:00 lands on the 14:00 timestamp. Tape readers should check the print's as-of versus tape-reported time before drawing inference.
- Dark print volume is published in aggregate, not per-pool. The specific ATS (UBS ATS, IEX, JPMX, etc.) is not disclosed in the consolidated tape feed.
Where this metric appears on Tapeboard
Dark pool prints render on /scanner with venue and time filters, on every `/stocks/{T}` page in the institutional-activity panel, and as a screener-preset (e.g., "Largest dark prints today").
Tapeboard surfaces this metric as a first-class screening filter. See the comparison pages at all Bloomberg alternatives for how Tapeboard's dark pool print surface compares against Koyfin, Finviz, TradingView, and Unusual Whales.
Related terms
- Options Flow: OPRA is the consolidated US options price-reporting authority; every executed options trade reports to OPRA in real time.
- Relative Volume (RVOL): Time-of-day-aware. RVOL at 10:00 ET compares against the typical 10:00 ET cumulative volume, not the typical close-of-day total.
- Short Interest: FINRA short-interest reports settle bi-monthly with a publication lag of about 10 business days from the report date.
Primary sources cited
- SEC Form ATS-N (Regulation ATS): Dark pools are registered with the SEC as Alternative Trading Systems under Form ATS-N. https://www.sec.gov/info/regatsn, retrieved 2026-05-04.
- FINRA short-sale rules and Reg SHO: Off-exchange trades report to the FINRA Trade Reporting Facility (TRF) after execution. https://www.finra.org/rules-guidance/key-topics/short-sale, retrieved 2026-05-04.
Methodology last reviewed 2026-05-04 by Marcus Reilly, Editor at Tapeboard. Every claim on this page has a row in the citation registry. Glossary terms reverify on the Jan 15 / Apr 15 / Jul 15 / Oct 15 cron and any time the underlying primary-source publishes a methodology change. See methodology for the full fact-check process and corrections for the public correction log.
Disclaimer. This page is for educational and informational purposes only. Nothing on Tapeboard is investment advice. See the full risk disclaimer.