2.2 Structure of UK and International Financial Markets

Knowing the layout of UK and international financial markets lets you place each product and each firm in its right context. This section sets out the main UK venues, the leading international exchanges, and the primary/secondary and wholesale/retail distinctions that determine how a transaction is regulated.

UK Market Structure

UK financial markets are organised across several specialist venues. Each is regulated by the Financial Conduct Authority (FCA) as a recognised investment exchange (RIE), a recognised overseas investment exchange (ROIE), or a multilateral trading facility (MTF).

The Alternative Investment Market (AIM) sits inside the LSE group and is a primary market for smaller, growth-oriented companies with lighter disclosure than the Main Market. AIM has been a launch venue for many UK fund managers' holdings and is recognised by tax-advantaged schemes such as ISAs (subject to the usual eligibility rules).

From 6 July 2026, the FCA ended its post-Brexit commodity position-limit regime (Policy Statement PS25/1), so ICE Futures Europe and the LME now set and administer their own position limits for commodity derivatives. This is an example of how the structure of UK markets is being recalibrated post-Brexit.

International Markets

UK investors and advisers need to know the principal overseas exchanges because client portfolios frequently hold global equities, ADRs and depositary receipts.

Auction vs dealer markets

In an auction market (NYSE, LSE), buyers and sellers submit bids and asks that are matched by an order book, often with a designated market maker obliged to maintain orderly prices. In a dealer market (NASDAQ, SEAQ historically), competing dealers quote firm bid and ask prices and trade from their own books. Modern electronic venues blur this distinction, but the exam still expects you to recognise the difference.

Primary vs Secondary Markets

The most fundamental split is between primary and secondary markets.

graph TD
    subgraph Primary["PRIMARY MARKET"]
        Iss["Issuing Company"] -->|New securities| UW["Investment Bank / Sponsor"]
        UW -->|Sells to investors| Inv1["Initial Investors"]
        Inv1 -->|Proceeds (net of fees)| Iss
    end
    subgraph Secondary["SECONDARY MARKET"]
        Inv1 -->|Trades existing securities| Inv2["Other Investors"]
        Inv2 -.->|Liquidity to primary| Inv1
    end

In the primary market, an issuer sells new securities and receives the proceeds (net of underwriting fees). UK examples include an LSE Main Market IPO, an AIM admission, a gilt auction by the UK Debt Management Office (DMO) or a corporate bond issue. In the secondary market, existing securities trade between investors and the issuer receives nothing. Secondary markets give primary investors the liquidity to sell, which makes them more willing to subscribe in the first place.

Wholesale vs Retail Markets

A second distinction drives much of conduct regulation:

• Wholesale markets involve professional, institutional and corporate counterparties — banks trading with each other in SONIA, fund managers buying blocks of gilts from a primary dealer, corporates hedging FX with a bank. Wholesale participants are presumed able to look after themselves, so conduct rules are lighter and many COBS protections do not apply.
• Retail markets involve individuals and small businesses. Conduct rules under COBS, the consumer duty, the FSCS and the FOS apply most strongly here.

A single product can sit in both markets. A gilt is bought wholesale by a pension fund at a DMO auction, then sold retail to an individual via a broker, with each leg subject to different conduct rules. The FOS award limit of £455,000 for complaints referred on or after 1 April 2026 (about acts or omissions on or after 1 April 2019) only applies in retail dealings.

Why London and How Post-Brexit?

London's place as a global hub depends on the openness of UK markets to overseas investors and overseas participants. After Brexit, UK firms lost automatic passporting rights into the EU single market. Access now depends on the EU granting equivalence determinations (limited and revocable), bilateral memoranda of understanding (the UK–EU MoU on regulatory cooperation was signed in 2023), and individual recognition regimes. The structure of UK markets has therefore become partly a matter of foreign policy as well as domestic regulation.

Key Takeaways for the Exam

• LSE (equities/bonds), LME (metals), ICE Futures Europe (energy and STIR) and AFX (SME growth) are the UK's main venues.
• NYSE is an auction market; NASDAQ is a dealer market.
• Primary markets pay proceeds to the issuer; secondary markets provide liquidity.
• Wholesale vs retail status determines which COBS protections apply.
• Post-Brexit access to EU markets depends on equivalence and bilateral MoUs.