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SEAQ: Stock Exchange Automated Quotations System

The SEAQ (Stock Exchange Automated Quotations) system is an electronic trading service used to facilitate market-making and trading of securities in the United Kingdom.

The SEAQ (Stock Exchange Automated Quotations) system is an electronic trading service used to facilitate market-making and trading of securities in the United Kingdom.

Types

SEAQ supports two main segments:

  • SEAQ (Main Market): This segment deals with larger, more liquid securities that are actively traded.
  • SEAQ International: Focuses on international securities, accommodating global trading activities.

Detailed Explanations

SEAQ operates as an electronic quotation system that primarily caters to market makers. It facilitates the display and dissemination of bid and offer prices for a wide range of securities. Market makers provide liquidity by offering to buy (bid) and sell (offer) securities at specified prices, thus ensuring continuous and competitive trading.

Importance

SEAQ is crucial for maintaining liquidity in the stock market, particularly for less liquid or less frequently traded securities that may not be suited to a continuous order-driven system like SETS. It helps in ensuring that there is always a buyer and a seller available, facilitating smoother transactions and price discovery.

  • Market Maker: A firm or individual that provides liquidity to the market by being willing to buy and sell securities at publicly quoted prices.
  • Bid Price: The price a buyer is willing to pay for a security.
  • Offer Price (Ask Price): The price a seller is willing to accept for a security.
  • Liquidity: The ease with which an asset can be converted into cash without affecting its market price.

FAQs

Q: What is the primary function of SEAQ? A: SEAQ facilitates electronic trading by providing bid and offer quotations for securities, particularly those that are less liquid.

Q: How does SEAQ differ from SETS? A: SEAQ is a quote-driven system relying on market makers, while SETS is an order-driven system that uses a central order book.

Revised on Monday, May 18, 2026