Glossary term
Consolidated Tape System (CTS)
The Consolidated Tape System is the CTA market data feed that disseminates last-sale trade information for Network A and Network B securities.
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What Is the Consolidated Tape System (CTS)?
The Consolidated Tape System, or CTS, is the CTA market data feed that disseminates last-sale trade information for Network A and Network B securities. It is the trade-reporting side of the CTA consolidated data environment.
CTS helps investors and market professionals see executed trades across participating venues in one consolidated stream.
Key Takeaways
- CTS disseminates last-sale trade reports.
- It is distinct from CQS, which disseminates quote information.
- CTS is part of the CTA Plan's consolidated market data infrastructure.
- The feed supports trade displays, market data vendors, surveillance, and analytics.
- CTS helps the market see trades that occur across many venues.
How CTS Works
When a trade in a covered security is executed or reported through the appropriate channel, transaction data flows into the consolidated system. CTS processes and distributes that last-sale information to data subscribers.
The feed can be used in time-and-sales displays, price charts, volume statistics, market surveillance, and other systems that depend on a consolidated record of completed trades.
CTS Versus CQS
System | What it shows |
|---|---|
CTS | Completed trades and last-sale prices. |
CQS | Current bids and offers. |
SIP | Processor infrastructure that consolidates and disseminates data. |
Practical Interpretation
CTS is useful because the U.S. equity market is fragmented. A security may trade on multiple exchanges and through off-exchange reporting channels. The consolidated trade feed creates a more complete view of actual trading activity than any single venue's tape.
CTS still does not show every detail a trader might want. It does not replace full depth-of-book feeds, proprietary exchange data, or order-level audit data. Its role is to provide a consolidated last-sale record.
How CTS Is Used
CTS data helps answer simple but important questions: what traded, at what price, when, and in what size. Those last-sale records support charts, market summaries, volume analysis, broker displays, regulatory review, and historical data products.
Because CTS is focused on trades, it should be read together with quote data when analyzing execution quality. A last sale can show where a trade occurred, but the surrounding quotes help explain whether that execution was favorable, costly, or simply consistent with the displayed market at the time.
CTS can also help distinguish reported activity from displayed interest. A security may show heavy trade prints even when displayed depth is thin, or it may show a stale last sale even though quotes have moved. Pairing CTS with CQS gives a more complete view of what happened and what was available.
This distinction matters in fast markets, thinly traded securities, and post-news trading where quotes and trades can move at different speeds.
The Bottom Line
CTS is the consolidated last-sale feed for CTA-covered securities. It is a core part of the public data infrastructure that lets the market see where trades have actually occurred.