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Consolidated Market Data Feed

The consolidated market data feed is the official, real-time aggregated market data published by the Securities Information Processor, combining quotes and trades from all US venues. It provides the national best bid and offer (NBBO), trade reports, and other essential data. The consolidated feed is available to the public (with minimal delay) and is the basis for regulatory compliance and fair execution.

This entry is about the official aggregated feed. For faster exchange-specific feeds, see direct market data feed; for the system producing it, see SIP.

Role and importance

The consolidated feed is the official market data source. It is mandated by SEC rules and serves as the basis for:

  • Regulatory compliance. The SEC uses consolidated feed data to detect violations.
  • Best execution. Brokers route orders to achieve NBBO as quoted on the consolidated feed.
  • Index calculations. Market indices use consolidated feed prices.
  • Fair pricing. Investors rely on consolidated feed quotes to understand fair market values.

Data components

The consolidated feed includes:

Quote information:

  • National best bid (highest price any venue is bidding).
  • National best offer (lowest price any venue is asking).
  • Size at each level.

Trade information:

  • Executed trade price.
  • Volume.
  • Time of execution.
  • Venue code.

Aggregate volumes and statistics. Opening prices, daily highs/lows, total volume.

Latency characteristics

Consolidated feed latency varies but is typically:

  • Real-time for SIP subscribers: 1–10 milliseconds from market event to data reception.
  • Delayed for public: Professional-grade data is real-time; free retail data has a 15-minute delay.

This is slower than direct exchange feeds but faster than historical standards.

Public access

Free delayed data: Market data websites (Yahoo Finance, Google Finance, your broker’s platform) show quotes delayed by 15 minutes.

Real-time retail data: Most brokers provide real-time quotes to active traders at no additional charge.

Professional data: Investment firms pay for real-time professional-grade feeds, often bundled with other data (fundamental data, news, etc.).

Regulatory framework

The SEC mandates the consolidated feed under Rule 10b-2 and Reg NMS. The feed must:

  • Aggregate all venues fairly.
  • Update in real time.
  • Be accessible to the public (with limited delays for retail).
  • Provide a basis for calculating fair prices.

Consolidated feed vs. direct feeds: Trade-offs

AspectConsolidated FeedDirect Feeds
Latency1–10ms10–500 microseconds
CostLow/freeHigh ($500–$10K+/month)
DetailNBBO, top levelsFull order book
Official statusYes, regulatory standardNo, venue-specific
Fair to allYesNo; favors fast participants

Most retail investors use consolidated feed; institutions and HFTs use direct feeds for an advantage.

Data normalization and consolidation process

The SIP process:

  1. Data collection. Quotes and trades from all venues flow into the SIP.
  2. Aggregation. The SIP combines data across venues for each symbol.
  3. NBBO calculation. The best bid and ask are identified.
  4. Publication. The consolidated tape is published to subscribers and the public.

This process is fully automated and occurs in near-real time.

Use cases for consolidated data

Regulatory monitoring. The SEC and FINRA use consolidated feed data to detect market manipulation, insider trading, and violations.

Index management. S&P 500 prices are based on consolidated feed closing prices.

Academic research. Researchers use historical consolidated tape data to analyze market behavior.

Retail investing. Individual investors using consolidated feed data on their brokers’ platforms make trading decisions.

Benchmarking. Fund managers benchmark their returns against market indices calculated from consolidated feed data.

Limitations and criticisms

Latency gap. The SIP is slower than direct feeds, creating fairness concerns.

Order routing constraints. Brokers must route to the venue showing the NBBO, but by the time this appears on consolidated tape, the opportunity may have passed on direct feeds.

Information asymmetry. Participants with access to direct feeds see prices before retail investors using consolidated data.

Future evolution

The SEC has periodically discussed speeding up the consolidated feed or harmonizing it with direct feed speeds to reduce information asymmetries. However, technological and competitive interests have prevented major changes.

See also

Wider context