Hermēs DocumentationDark Pool
Ultra-only — X-ray off-exchange dark-pool prints across all US equities: price-level clustering, intraday notional flow, and block-by-block cross prints. See where the silent money is positioned.
Dark Pool is an Ultra-only window that lays out off-exchange (dark-pool) prints across the entire US market: the size institutions quietly accumulate or distribute away from the lit exchange — which prices they stack at, how it flows intraday, and what every block cross looks like. It answers one question: where is the silent money positioned right now.
Dark-pool prints are a record of what already happened, not a forecast. They work best as a second-source confirmation of GEX levels: when institutions keep stacking at a price that is also a dealer wall, that support/resistance is more trustworthy.
Who can use it
- Ultra + signed in. Non-Ultra users see an upgrade prompt.
- Location: Options Desk → "Add window" → "Dark Pool".
- Coverage: all US stocks + ETFs. Indices (SPX/NDX/VIX/RUT) and futures have no off-exchange prints and prompt you to pick a stock or ETF.
Coverage: any US ticker
The header offers two ways to pick a symbol:
- 62-symbol dropdown — common catalog stocks/ETFs (gated to your tier).
- Free-text box — type any US stock/ETF ticker (e.g.
DIS,JPM,BA) and press enter. Not limited to the 62-symbol catalog; it fetches that symbol's off-exchange prints directly.
Panel walkthrough
The window is a single-view information chain (no tabs), top to bottom: levels → flow → prints.
① Price-level clustering (Levels)
Aggregates off-exchange prints per price over your selected date range, in three blocks:
- Trend chart — price trend + current-price line, overlaid with support (teal) / resistance (amber) level lines; the top-left "Intraday" badge shows today's % change.
- Donut — each top price's share of off-exchange notional (with an "Other" segment closing the ring), so the most concentrated prices pop instantly.
- Table — notional / size / share per price plus a buy/sell balance bar, centered on spot.
② Intraday flow (Flow)
Off-exchange notional time series with the price line overlaid, on a full XY coordinate system (left axis notional, right axis price, bottom axis time). Hover to read the notional, trade count, and size at any moment. Use it to judge whether money accumulated on the way up or on the way down.
③ Block prints (Prints)
At the bottom, a tape of block-by-block off-exchange cross prints you can scroll with the wheel — time, price, side, size, print by print. This is the rawest fact flow: every fill the big money actually crossed.
Start/end date range
The header range picker decides how much off-exchange history "Levels" aggregates: widen it for the structural center of gravity, narrow to a single day for that day's temporary concentration. Intraday flow and block prints use the range's end date as the "as of" session.
Typical workflow
- Open Dark Pool and pick a stock/ETF you're watching (or type a ticker).
- Bound the window with the range picker, then read Levels for the largest off-exchange prices.
- Switch focus to Flow for net direction and timing of accumulation.
- Scroll the Prints tape to confirm real blocks are behind it.
- Compare off-exchange accumulation prices to your GEX levels — write the double-confirmed ones into your watchlist.
Indices and futures have no off-exchange prints. When you see the "indices / futures have no dark-pool prints" message, pick a stock or ETF instead (e.g. SPY, QQQ, AAPL).
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Frequently asked questions
What subscription does Dark Pool need?
Dark Pool is an Ultra-only window; it requires an Ultra subscription and sign-in. It taps an institutional off-exchange prints data source covering the entire US market (single names + ETFs).
Why do indices/futures like SPX or ES show no dark-pool data?
Off-exchange (dark-pool) prints only occur on tradable stocks and ETFs. Indices (SPX / NDX / VIX / RUT) and futures have no off-exchange prints, so when you pick one the window tells you to choose a stock or ETF instead (e.g. SPY, QQQ, AAPL).
Can I look up any US ticker beyond the catalog?
Yes. Besides the 62-symbol dropdown, the window header has a free-text box — type any US stock/ETF ticker (e.g. DIS, JPM, BA) and press enter to load its off-exchange prints directly.
How often does dark-pool data refresh?
The window refreshes every few minutes; identical symbol+range requests reuse a cross-user shared cache within its TTL to avoid duplicate upstream calls. Price-level clustering aggregates over the start/end date range you pick.
Can dark-pool prints predict direction?
No. Dark-pool prints are a record of what already happened, not a forecast. They work best as a second-source confirmation of GEX levels — when institutions keep stacking at a price that is also a dealer wall, that support/resistance is more trustworthy.
Feedback
A public feedback board — submit feature requests and bug reports, vote on ideas, join the discussion, and track the team's progress.
Whole-Market Institutional Data
Ultra-only — options order flow, cross-expiry Greek heatmaps (GEX/DEX/VEX/CEX), full term structure, Symbol Center, and ticker news wired into the entire US market. Any ticker, on demand.