Does my order go through a dark pool?
By Faizan Ahmad. Updated .
Probably not a dark pool, and probably not an exchange either. The SEC said in 2022 that retail brokers send more than 90% of individual investors' marketable stock orders to a small group of off-exchange dealers called wholesalers, which typically fill them internally. Those fills are reported to FINRA's trade reporting facilities, the same place dark pool trades go, so many data feeds lump them together as off-exchange. Your broker's Rule 606 report shows which venues its orders went to and what it was paid for them.
Where does a retail stock order actually go?
- You place the order. Unless you direct it to a specific venue, your broker decides where it goes.
- Most marketable orders go to a wholesaler. Marketable means it can fill right away at the best available price: a market order, or a limit order priced to fill now. The wholesaler trades against it from its own account, often at a slightly better price than the exchanges' best quote.
- Some orders go elsewhere. Your broker or the wholesaler can send an order to an exchange or to a dark pool.
- The trade is reported. Exchange trades reach the tape from the exchange. Wholesaler and dark pool trades are reported to a FINRA trade reporting facility within 10 seconds and published on the same consolidated tape.
The SEC's explanation for step 2 is cost: retail orders are cheaper for a dealer to trade against than the flow on exchanges, because prices tend to move against the dealer less afterward. That's why wholesalers pay brokers for the flow and still give you a small price improvement.
Wholesaler, dark pool or exchange: what's the difference?
| Exchange | Wholesaler | Dark pool (ATS) | |
|---|---|---|---|
| What it is | A registered national securities exchange, like Nasdaq or the NYSE | A dealer that fills your order itself | A broker-run system that matches buyers and sellers without showing their orders |
| Shows quotes before a trade? | Yes | No | No |
| Who's on the other side | Whoever's order was resting there | The wholesaler | Another user of the pool |
| How the trade is reported | By the exchange, straight to the tape | To a FINRA trade reporting facility | To a FINRA trade reporting facility |
| Regulated as | An exchange | A broker-dealer | A broker-dealer under the SEC's Regulation ATS |
The SEC has long treated these as two separate sources of hidden trading. In 2009 testimony it said dark liquidity is offered "not just by dark pools, but by large dealer firms that internalize customer orders." A wholesaler is the second kind. For what makes the first kind a dark pool, see what is a dark pool?
How to check where your broker sends orders (Rule 606)
Every broker that routes customer orders must publish a Rule 606 report for each calendar quarter, within one month after the quarter ends, and keep it on a free public website for three years. FINRA also collects them in a database you can search by firm name. Here is what to look for:
- Three sections: S&P 500 stocks, other listed stocks, and options orders under $50,000.
- Monthly figures: routing data is broken down by calendar month inside each quarterly report.
- The venue list: the top 10 venues for orders the broker routed on its own, plus any venue that got 5% or more. Wholesalers, exchanges and dark pools can all appear here by name.
- Payment for order flow: the net amount the broker received from each of those venues, and a description of the terms behind it.
To tell whether a venue on the list is a dark pool, check it against the SEC's list of alternative trading systems that file Form ATS-N for listed stocks. The public report covers orders you didn't direct. For your own trades, Rule 606(b)(1) lets you ask your broker which venues your orders were routed to and when they executed.
What about options orders?
Options orders appear in 606 reports too, and brokers can be paid for that flow as well. But listed options trade on exchanges, so the fill itself prints on an exchange and goes out on OPRA. There is no options dark pool; are there dark pools for options? explains why.
Does it matter which venue fills you?
For a small order, the price you get matters more than the venue's label. The argument among regulators is whether that price is as good as it could be. In its 2022 proposal to make wholesalers compete for retail orders in auctions, the SEC estimated that the price improvement wholesalers give falls short of their cost savings by about 1.08 basis points per dollar traded, around $1.5B a year in total. That's a policy fight measured in basis points, not something you can see in a dark pool feed.
Will my trade show up in dark pool data?
Your fill is reported to FINRA and counts toward off-exchange volume. That's one reason "off-exchange" is so much bigger than true dark pool trading, as how much trading happens in dark pools shows. But the prints dark pool traders watch are institution-sized. On October 30, 2026, SPY's off-exchange prints included 1,000,000 shares at $753.81 at 1:58 PM ET, a $753.81M trade, and a late $2.84B print reported at 4:28 PM ET. A 50-share retail fill is a rounding error next to those.
Labels blur this. Tradytics shows every trade reported to a FINRA facility as "Dark pool," so wholesaler fills and true dark pool trades sit under one label. What makes a print worth reading is its size and price, not the label. And if you've seen "dark pool short volume" figures, those come from the same blended off-exchange data; off-exchange vs short volume untangles them.
How to see it on Tradytics
The dark pool page shows where size printed across the market: each print's time, price, shares, value and venue, marked Dark pool for anything reported to a FINRA facility or with the exchange's name for exchange blocks of 25,000 shares and $250K or more. It's built for reading large trades, not for tracking your own orders; for those, your broker's 606 report and trade confirmations are the record. On Live and Pro, prints appear within about 15 minutes of their report; Free shows yesterday's session.
Common questions
Is payment for order flow legal?
In the US, yes, with disclosure. Rule 606 reports must show the net payment for order flow a broker received from each major venue and describe the terms of those arrangements.
Can I choose where my order goes?
Some brokers let you direct an order to a specific venue. Rule 606's public reports cover the orders you don't direct.
Is a wholesaler a dark pool?
No. A dark pool matches orders between its users; a wholesaler is one dealer trading against you. Both trade off-exchange and report to FINRA, which is why they get confused.
Where do I find my broker's 606 report?
Search your broker's website for "Rule 606," or look the firm up in FINRA's database of 606 reports.
Sources
- SEC fact sheet, Proposed Rule to Enhance Order Competition (2022): more than 90% of individual investors' marketable orders routed to wholesalers, why, and the estimated $1.5B shortfall.
- SEC press release 2018-253: what Rule 606 reports must contain, including monthly breakdowns, S&P 500 and options sections, top venues and payment for order flow.
- 17 CFR 242.606, Rule 606: quarterly reports published within one month after the quarter, kept online for three years, and customer requests for their own order routing under 606(b)(1).
- FINRA, NMS Equity and Option Order Routing Reports (SEC 606): the searchable database of broker 606 reports.
- SEC testimony on dark pools (October 28, 2009): dark liquidity offered by dark pools and by dealers that internalize customer orders.
- Dark pool and block prints on 2026-10-30: 13,984 prints worth $277.16B, $107.38B of it in dark pools.
- Most traded in dark pools and blocks: QQQ ($16.44B), SPY ($14.91B), NVDA ($9.47B), AAPL ($9.03B), MSFT ($6.76B).
Updated 2026-11-02 16:05 UTC