CTS and CQS: The NYSE-Side Consolidated Tape

Key Takeaways

• CTS reports trades and CQS reports quotes for NYSE-listed and other exchange-listed stocks.
• Both run under the Consolidated Tape Association plan and feed the National Best Bid and Offer.
• Investors often confuse the trade tape with the quote system, but they are two separate streams.
• The tape carries regulatory data and serves as a reference price for best execution.

What It Is

The Consolidated Tape System, or CTS, and the Consolidated Quotation System, or CQS, are the two data streams operated under the Consolidated Tape Association plan. CTS disseminates trade data, the record of last sales. CQS provides quotes and calculates a National Best Bid and Offer.

The CTA plan covers NYSE-listed securities and other names that are not Nasdaq-listed. Coverage splits into Network A, administered by the NYSE for NYSE-listed securities, and Network B, covering NYSE Arca, NYSE American, and other listings. The Nasdaq-listed universe is covered separately by the UTP plan.

The Intuition

A NYSE-listed stock does not trade only on the NYSE. It changes hands across many exchanges and off-exchange venues. To produce one agreed price, the data from every venue must be collected and merged.

CTS and CQS do exactly that for NYSE-listed and related names. Since the late 1970s, all SEC-registered exchanges and market centers that trade these securities have sent their trades and quotes to a central consolidator, which produces the CTS and CQS streams and distributes them worldwide. The result is a common reference that brokers, vendors, and investors all share.

How the CTS CQS Consolidated Tape Works

Each venue sends its trades and quotes to the consolidator. CTS assembles the last sale data into a single trade tape. CQS assembles the quotes, compares the best bid and offer across venues, and computes the NBBO.

The two systems answer different questions. CTS tells you what price a stock just traded at. CQS tells you the best price currently available to buy or sell. Both are top-of-book feeds, carrying the consolidated best quote and last sale rather than the full depth of the order book, which lives only on exchange direct feeds.

The consolidated tape also supports compliance. By providing a single real-time reference price, CTS and CQS help firms satisfy Regulation NMS and best execution obligations. The streams also carry regulatory signals such as halts and limit up limit down information. The 2020 Market Data Infrastructure Rule applies to this plan as well, moving the market toward a decentralized model in which competing consolidators, rather than a single exclusive processor, distribute consolidated data.

Worked Example

Suppose a NYSE-listed stock trades across the NYSE, NYSE Arca, and two off-exchange venues. At one instant the best bids are 120.10, 120.11, 120.09, and 120.10, with best offers of 120.14, 120.13, 120.15, and 120.14.

CQS scans the quotes. The highest bid is 120.11 and the lowest offer is 120.13. It publishes the NBBO as 120.11 bid, 120.13 offer. Moments later a 500-share trade executes on NYSE Arca at 120.12. CTS reports that last sale to the tape: 500 shares at 120.12.

A broker watching the consolidated streams sees both the best available prices through CQS and the actual print through CTS. The two together give a complete top-of-book picture for that NYSE-listed name across all venues.

Common Mistakes

1. Confusing CTS with CQS. CTS reports trades that already happened. CQS reports quotes available now. Treating them as one stream leads to wrong conclusions.

2. Assuming the tape shows depth. CTS and CQS carry top-of-book and last sale data only. The full order book comes from exchange direct feeds.

3. Mixing up the plans. The CTA plan covers NYSE-listed and related names. Nasdaq-listed stocks flow through the separate UTP plan.

4. Ignoring Network A versus Network B. Coverage splits by listing venue within the CTA plan. Network A is NYSE-listed; Network B covers other listings.

5. Overlooking the shift to competing consolidators. The 2020 rule changes how this data is distributed. Assuming a permanent single exclusive processor is outdated.

Frequently Asked Questions

What is the CTS CQS consolidated tape in simple terms? CTS is the system that reports trades and CQS is the system that reports quotes for NYSE-listed and related stocks. Together they form the consolidated tape for those securities.

How do CTS and CQS affect investment decisions? CQS supplies the NBBO that brokers reference for best execution, and CTS shows the actual trade prices. Most screens for NYSE-listed stocks display this consolidated data.

What is a real-world example of CTS and CQS at work? When a NYSE-listed stock shows different quotes on four venues, CQS publishes the best bid and offer, and CTS reports the next executed trade to the tape.

How can investors use CTS and CQS knowledge effectively? Understand that the quote and last price you see are consolidated top-of-book data, not the deepest or fastest view. Match your data needs to your trading style.

How is CTS different from CQS? CTS reports completed trades, the last sale data. CQS reports current quotes and calculates the National Best Bid and Offer. One looks backward, the other shows what is available now.

Sources

1. Consolidated Tape Association. "Overview." https://www.ctaplan.com/index
2. NYSE. "Consolidated Tape Association." https://www.nyse.com/data/cta
3. SEC. "Final Rule: Market Data Infrastructure." https://www.sec.gov/files/rules/final/2020/34-90610.pdf
4. FINRA. "National Market System Plans." https://www.finra.org/rules-guidance/guidance/national-market-system-plans

Disclaimer

This article is educational content only and is not financial advice. Nothing here is a recommendation to buy, sell, or hold any security. Consult a licensed advisor before making investment decisions.