RAIL dark pool volume
FINRA weekly ATS volume · per dark pool · RAIL off-exchange context · 8-week trend
Weekly FINRA data, published on a delay. Week shown: Sep 14 to 18, 2026. FINRA first published this week's NMS Tier 2 file on Oct 19, 2026, 31 days after the week ended. These are the newest weekly numbers FINRA has published, not a live feed.
In the week of Sep 14 to 18, 2026, RAIL traded 260.2K shares in dark pools (FINRA-reported alternative trading system volume) across 22 dark pools, the largest was LEVEL ATS with 37.2K shares, dark pools carried 31% of its 832.5K FINRA-reported off-exchange shares. FINRA first published this week's file on Oct 19, 2026.
Latest week by dark pool
RAIL dark pool volume, week of Sep 14 to 18, 2026
| Dark pool | Shares | Trades | Share of RAIL dark pool volume |
|---|---|---|---|
| LEVEL ATS | 37.2K | 1,450 | 14.3% |
| INTELLIGENT CROSS LLC | 30.7K | 1,098 | 11.8% |
| ONECHRONOS | 27.5K | 310 | 10.6% |
| UBS ATS | 26.0K | 483 | 10.0% |
| INSTINCT X | 25.9K | 512 | 9.9% |
| MS TRAJECTORY CROSS (ATS-1) | 25.6K | 2,593 | 9.9% |
| SIGMA X2 | 14.0K | 337 | 5.4% |
| VIRTU MATCHIT ATS | 13.5K | 114 | 5.2% |
| MS POOL (ATS-4) | 12.4K | 85 | 4.8% |
| BIDS ATS | 11.8K | 10 | 4.5% |
| JPM-X | 6.3K | 89 | 2.4% |
| THE BARCLAYS ATS | 6.3K | 108 | 2.4% |
Top 12 of 22 reported dark pools, covering 100% of the FINRA dark pool total.
Weekly trend
RAIL dark pool volume history
| FINRA week | Dark pool shares | Non-ATS off-exchange | Dark share of off-exchange |
|---|---|---|---|
| Sep 14, 2026 to 18, 2026 | 260.2K | 572.3K | 31% |
| Sep 7, 2026 to 11, 2026 | 197.4K | 186.6K | 51% |
| Aug 31, 2026 to 4, 2026 | 101.1K | 253.8K | 28% |
| Aug 24, 2026 to 28, 2026 | 120.3K | 299.1K | 29% |
| Aug 17, 2026 to 21, 2026 | 122.1K | 199.0K | 38% |
| Aug 10, 2026 to 14, 2026 | 219.5K | 242.0K | 48% |
| Aug 3, 2026 to 7, 2026 | 175.4K | 333.8K | 34% |
Dark pool volume is up 113.0% versus four weeks earlier (Aug 17, 2026).
Off-exchange context
Dark pools are one half of off-exchange trading. In the week of Sep 14 to 18, 2026, FINRA reported 832.5K RAIL shares traded off the exchanges in total: 260.2K through dark pools and 572.3K through the non-ATS channel (internalizers and wholesale market makers reporting straight to FINRA). Dark pools carried 31% of that off-exchange total. This is a share of FINRA-reported off-exchange volume, not of total market volume; the FINRA weekly file does not include exchange volume.
How to read this
Dark pools are private alternative trading systems that match institutional orders without displaying them to the public first. The weekly FINRA file shows how many RAIL shares and trades each dark pool reported, aggregated for the whole week. It carries no prices, no trade sizes, and no direction, so it cannot say whether the volume was buying or selling. Use it to see where hidden liquidity concentrated, and pair it with the live chart for price context.
Related
RAIL stock page · Live RAIL chart · Dark pool tracker · What is a dark pool (glossary) · Data methodology · All tickers: dark pool hub
FAQ
How much RAIL volume trades in dark pools?
In the week of Sep 14 to 18, 2026, RAIL traded 260.2K shares in dark pools (FINRA-reported alternative trading system volume) across 22 dark pools, the largest was LEVEL ATS with 37.2K shares, dark pools carried 31% of its 832.5K FINRA-reported off-exchange shares. FINRA first published this week's file on Oct 19, 2026.
Which dark pools trade RAIL?
In the week of Sep 14 to 18, 2026, LEVEL ATS was the largest dark pool for RAIL with 37.2K shares, out of 22 dark pools that reported the ticker. The table above lists the rest.
Why is this data weeks old?
FINRA publishes dark pool volume weekly, on a delay. The week of Sep 14 to 18, 2026 was first published Oct 19, 2026, and nothing fresher exists until FINRA publishes the next week. We state the lag plainly instead of dressing delayed data up as live.
Does heavy dark pool volume mean big investors are buying?
No. Dark pool volume is hidden liquidity: it says where institutions chose to trade away from the lit exchanges, nothing about direction. FINRA reports share counts and trade counts, not prices, sizes, or sides. A week of heavy dark pool volume can accompany accumulation, distribution, or two-sided market making.