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Unlisted Securities Market

British  

noun

  1.  USM.  a market on the London Stock Exchange, established in 1980 and discontinued in 1996, for trading in shares of smaller companies, who did not wish to comply with the requirements for a full listing

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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