The premier market for the trading of equities on the London Stock Exchange. For this market the listing requirements are the most stringent and the liquidity of the market is greater than in the Alternative Investment Market. A company wishing to enter this market must have audited trading figures covering at least five years and must place 25% of its shares in public hands. The main market currently deals in over 2600 securities.

• asset constraint
• asset cover
• asset financing
• asset-liability gap
• asset-liability management
• asset management
• asset securitization
• asset-sensitive
• asset stripping
• asset swap
• asset turnover
• asset valuation
• asset value
• assignment
• assignment of insurable interest
• assignment of life policies
• associate company
• Association for Payment Clearing Services
• Association of African Development Finance Institutions
• Association of British Insurers
• Association of Corporate Treasurers
• Association of Futures Brokers and Dealers Ltd
• Association of International Bond Dealers
• Association of Lloyd's Members
• Association of Natural Rubber Producing Countries