AIM is a stock market for smaller, growing companies owned by the London Stock Exchange. It used to be known as the Alternative Investment Market, which is how it came by its name.
It was launched in 1995 to help smaller companies raise the capital they need to grow their businesses, and attracts listings from around the world. It’s one of the most successful markets of its type in the world. The costs of a listing are lower than on the London Stock Exchange’s Main Market and regulation is lighter. FTSE has three indices for AIM stocks: FTSE AIM UK 50, FTSE AIM 100 and FTSE AIM All-Share.