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Consolidated Tape

The consolidated tape is the official, real-time record of all trades executed in US-listed stocks across all venues — exchanges, alternative trading systems, and over-the-counter markets. It is produced by the Securities Information Processor (SIP) and shows each trade’s price, volume, and exact time. The consolidated tape is the source of truth for what has traded.

This entry is about the official trade reporting system. For the price quotation system, see consolidated tape bid-ask quotes; for the system that produces it, see Securities Information Processor.

How the consolidated tape works

Every time a trade executes on any US exchange or alternative trading system, it must be reported to the SIP. The SIP collects these reports and publishes them on the consolidated tape in real time.

Each tape entry includes:

  • Symbol: The stock ticker (e.g., AAPL, MSFT).
  • Price: The execution price.
  • Volume: Number of shares traded.
  • Time: The exact time of execution (to the millisecond or better).
  • Venue code: Which exchange or ATS executed the trade.

Two tapes: A and B

Historically, the US had two consolidated tapes:

  • Tape A: NYSE-listed stocks.
  • Tape B: NASDAQ and other exchange-listed stocks.

This distinction is largely historical; today, the two tapes are often discussed as one unified system, though separate reporting channels may persist for technical reasons.

Real-time transparency

The consolidated tape provides real-time transparency into what trades are occurring at what prices. An investor watching the tape sees the complete flow of trades. This transparency serves multiple purposes:

Price discovery. The tape shows the actual transaction prices, which form the basis for valuations.

Fraud detection. Unusual trading patterns (a stock trading in a narrow range with no fundamental news, then suddenly spiking) can signal manipulation. Regulators monitor the tape for suspicious activity.

Index calculations. Market indices use consolidated tape data to compute their levels and changes.

Trading volume and liquidity analysis

The consolidated tape is used by traders to estimate liquidity. If a stock is showing steady tape activity (thousands or millions of shares per minute), that signals liquidity. If tape activity is sporadic, that signals thin trading.

Technical analysts use tape reading — watching the flow of trades — to understand whether buying or selling pressure is dominant.

Settlement and post-trade processes

The consolidated tape data flows into clearing and settlement systems. The NSCC and other clearinghouses use tape data to reconcile what should settle with what actually happened.

Data access

Real-time data: Professional traders and institutions subscribe to real-time consolidated tape data feeds, provided through multiple vendors (Bloomberg, Refinitiv, eSpeed, etc.). These subscriptions can be expensive.

Delayed data: The public can access delayed consolidated tape data (typically 15 minutes delayed) for free through websites like NASDAQ.com, NYSE.com, and financial news sites.

Historical data: Academic researchers and analysts can purchase historical consolidated tape data from various vendors.

Regulatory reporting and compliance

All venues are required by SEC rule to report trades to the SIP promptly. Failures to report, delayed reporting, or inaccurate reporting are violations. The SEC periodically audits venues for reporting compliance.

Tick data and intraday analysis

Academics and traders use consolidated tape data at the intraday tick level to analyze market behavior:

  • Bid-ask bounce: Analyzing the execution price relative to the mid-price (bid plus ask divided by two) to estimate spreads.
  • Volume clustering: Analyzing whether volume concentrates at certain price levels or times.
  • Price impact: Analyzing how prices move after large trades.

This tick-by-tick analysis requires access to the complete consolidated tape data.

Consolidated vs. direct feeds

While the consolidated tape is the official record, many traders also subscribe to direct feeds from individual venues (NYSE OpenBook, NASDAQ TotalView). These direct feeds show more detail (full order book) and may be faster than consolidated tape data.

However, the consolidated tape remains the official source for what has traded and is used for regulatory and compliance purposes.

See also

Wider context