The Unlisted Securities Market (USM), which ran from 1980 to 1996, was a stock exchange set up by the London Stock Exchange. It served a market for shares of companies too small to qualify for a full listing. 1980 is a leap year starting on Tuesday. ... 1996 is a leap year starting on Monday of the Gregorian calendar, and was designated the International Year for the Eradication of Poverty. ... The Source by Greyworld, in the new LSE building The London Stock Exchange (abbreviated LSE) is a stock exchange market located in London. ...