What is the main LSE trading platform (order-driven system) used to trade shares in the FTSE All-Share Index?

• A. Sets
• B. Setsqx
• C. SeaQ
• D. Orb

Answer: (A)

In London, the main place where order-driven trading happens for UK shares, including those in the FTSE All-Share, is SETS. This platform operates as a central electronic order book, continuously matching buy and sell orders at the best prices and providing transparent price discovery for the traded shares. That makes it the default, most-used system for the majority of day-to-day trading in these stocks.

SETSqx is a variant that adds a crossing function for large orders within the SETS framework, not the primary continuous trading mechanism. SEAQ is a separate, quote-driven market used for stocks not on SETS, driven by market makers rather than an order book. ORB is not the standard order-driven platform for FTSE All-Share shares.