Market structure note / FINRA OTC transparency / data through the week of 2026-09-07, refreshed 2026-10-01

The Wholesaler Split

Most of what gets sold to retail traders as dark pool activity is not institutional. It is retail order flow being internalized by wholesalers and reported off exchange. FINRA publishes the two separately. Almost nobody reads them separately.

63.8%Wholesaler, 10wk mean
58.5 to 67.1%Weekly range
2,707Tier 1 names
2 to 3 wkFINRA publishing delay

Off exchange does not mean dark pool. A dark pool is an ATS, a registered venue where institutions cross size anonymously. A wholesaler filling your market order from its own inventory is something else entirely, and it is the larger half.

Who is really on the other side

Share of off-exchange volume that is wholesaler internalization rather than true dark pool, averaged over ten weeks. Select any row for its week by week detail.

Wholesaler internalization True dark pool (ATS)

Hover or tab through a row to inspect it.

How your order becomes a print

  1. 01You send itA market order leaves your retail broker.
  2. 02It is routedNot to an exchange. To a wholesaler: Citadel Securities, Virtu, Jane Street.
  3. 03It is internalizedThey fill you from inventory. No exchange ever sees it.
  4. 04It is reportedThe trade prints to a FINRA trade reporting facility.
  5. 05You are shown itNow it is off-exchange volume, and it gets sold back to you as smart money.

Four things this data cannot tell you

01

There is no side

The feed carries seventeen columns. Not one records buy or sell. The word buying cannot come from this data. It is added by whoever is selling the alert.

02

It is weeks old

FINRA publishes each week about two to three weeks after it ends, and the newest week on this page began 2026-09-07. Nothing here supports a claim about what is happening right now.

03

Most of it is not dark pools

Roughly two thirds is wholesaler internalization, by FINRA's own classification field. Tools that quote total off-exchange volume are quoting mostly retail.

04

Your own order is inside it

If you bought through a retail broker that week, your shares are in the warm half of the bar you are being shown as institutional conviction.

What it is actually good for

Off-exchange share is a liquidity structure read. It tells you how retail-owned a name is. It is not, and cannot be, a directional one.

That is a real thing to know. The ordering above is remarkably stable: rank correlation between the newest week and every earlier week runs between 0.78 and 0.85, and BITO holds 95.9% wholesaler with a standard deviation of 2.4 across ten weeks. A name's wholesaler share is a structural property, not a weekly event. Read it as a crowd census, never as a trade.

Test the intuition

Three tickers, one question, five rounds: which name has the largest share of off-exchange volume that never crossed in a dark pool? It is built on the same figures as the chart above, and the answer has nothing to do with price.

Play the quiz

This is one piece of a longer study

The Circuit Breaker is a trading server that reads the market's plumbing rather than its moods: who is really on the other side, what the filings say, where the sizing went wrong. Weekly boards, no calls, no alerts to sell you.

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Method. FINRA OTC Transparency weekly summary, ten weeks from 2026-07-06 to 2026-09-07, restricted to NMS Tier 1 so the sample does not shift when Tier 2 publishes on its longer delay. Buckets split on FINRA's own summaryTypeCode: ATS_W_SMBL for registered dark pools, OTC_W_SMBL for non-ATS wholesaler internalization. Symbol-level aggregate rows only, never summed with per-firm rows, which would double count.

Attribution. OTC Transparency data is provided via finra.org and is copyrighted by FINRA 2026. FINRA is the owner and source of this data; the figures here are derived from it. Free to read, never sold.

Limits. Wholesaler internalization is predominantly retail marketable flow but is not exclusively retail. Percentages are shares, not notional. Tier 1 covers large caps only. Nothing here is a recommendation, and no figure on this page can indicate direction.