Dark Pool & Off-Exchange Volume Tracker

Dark Pool & Off-Exchange Volume Tracker monitors off-exchange trading activity using official FINRA Alternative Trading System (ATS) data and CBOE market share statistics. Dark pools and off-exchange venues account for roughly 35–40% of all US equity volume — this actor makes that institutional trading data accessible to retail traders and researchers without requiring expensive data subscriptions.

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Why use Dark Pool & Off-Exchange Volume Tracker?

1. Detect hidden institutional accumulation — Dark pool volume spikes in a specific stock can signal institutional buying before a price move, since large funds route orders off-exchange to minimize market impact.
2. Monitor lit vs dark market share shifts — A rising dark pool share for a specific venue may indicate improving execution quality, attracting more institutional flow.
3. ATS-level granularity — Identify which specific dark pools (IEX, Virtu, UBS ATS, etc.) are handling volume for a given stock — not just aggregate off-exchange totals.
4. Regulatory and compliance research — FINRA publishes ATS data with a 2-week delay; this actor surfaces it in structured form for compliance teams tracking venue usage.
5. Market microstructure analysis — Compare lit exchange vs dark pool volume ratios across stocks, sectors, or market conditions to study execution dynamics.

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How to use

1. Open the actor on Apify Store and click Try for free.
2. Choose a mode: market_share, ats_volume, or otc_summary.
3. For ats_volume mode, optionally set tickers to target specific stocks.
4. Click Start. Results are returned as structured records for the chosen mode.

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Input

Field	Type	Default	Description
mode	string	"market_share"	Data to fetch: market_share, ats_volume, or otc_summary
tickers	string	""	Comma-separated tickers for ats_volume mode (e.g. "AAPL,SPY,QQQ")
maxResults	number	100	Maximum records to return

Modes explained

Mode	Source	What it returns
market_share	CBOE US Equities	Exchange vs dark pool % breakdown by venue
ats_volume	FINRA ATS Transparency	Per-ticker weekly volume by ATS/dark pool name
otc_summary	FINRA OTC Data	Weekly aggregate off-exchange volume statistics

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Output

market_share mode:

{
  "venue": "NYSE",
  "market_type": "lit",
  "market_share_pct": 12.4,
  "volume": 1234567890,
  "date": "2026-08-29"
}

ats_volume mode:

{
  "ticker": "AAPL",
  "week": "2026-08-18",
  "ats_name": "IEX",
  "share_quantity": 45230000,
  "trade_count": 12400,
  "week_rank": 1
}

otc_summary mode:

{
  "week": "2026-08-18",
  "total_otc_shares": 98450000000,
  "total_otc_trades": 45200000,
  "ats_shares": 67300000000,
  "non_ats_shares": 31150000000
}

Output fields — market_share mode

Field	Description
venue	Trading venue name (NYSE, NASDAQ, IEX, Virtu, etc.)
market_type	lit (exchange) or dark (ATS/internalized)
market_share_pct	Percentage of total US equity volume
volume	Total shares traded at this venue

Output fields — ats_volume mode

Field	Description
ticker	Stock symbol
week	Week start date (Monday)
ats_name	Name of the Alternative Trading System (dark pool)
share_quantity	Number of shares traded in this ATS this week
trade_count	Number of individual trades

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Cost estimation

Pay-Per-Event: $0.005 per actor start + $0.005 per record returned.

Use case	Records	Estimated cost
Market share snapshot	~30 venues	~$0.15/run
ATS volume for 5 tickers	~50 records	~$0.25/run
Weekly OTC summary	1 record	~$0.01/run
Daily market share monitoring	30/day	~$0.15/day

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Data sources and freshness

Source	Data freshness	Notes
CBOE US Equities Market Statistics	Near real-time (T+1)	Exchange and dark pool market share
FINRA ATS Transparency Data	2-week delay (regulatory lag)	Per-ATS volume by ticker
FINRA OTC Market Summary	Weekly (Thursday release)	Aggregate off-exchange statistics

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FAQ

Why is FINRA ATS data delayed by 2 weeks? FINRA publishes ATS data with a regulatory-mandated 2-week delay. This prevents HFT firms from front-running ATS-specific information. The data is still highly useful for pattern analysis, compliance, and research.

What's the difference between ATS and dark pool? Dark pools are a subset of Alternative Trading Systems (ATS). All dark pools are ATSs, but not all ATSs are fully dark — some have limited transparency. The FINRA dataset covers all registered ATS venues.

How often should I run this actor? market_share mode: daily or weekly. ats_volume mode: weekly (matches FINRA's release schedule). otc_summary mode: weekly.

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Related actors

• Smart Money Wallet Tracker — On-chain equivalent: track institutional wallets on Ethereum/Solana
• Short Interest Tracker — FINRA short interest data; complements dark pool volume
• Options Unusual Activity — Another leading institutional signal alongside dark pool flow

Feedback

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Keywords: dark pool tracker, FINRA ATS data, off-exchange volume, dark pool share, institutional block trades, dark pool flow signal, OTC trading volume, CBOE market stats, institutional flow tracker, dark pool percentage, block trade frequency, alternative trading system, dark pool vs lit market