Why is it so risky trading in AIM stocks http://www.financial-spread-betting.com/Spread-betting-AIM-stocks.html and shares with low market caps as opposed to larger blue chip stocks? Chris Purdy, Sales Trader at Spreadex responds. A lot of spread traders find value in low market cap companies because they are undiscovered, untapped resource. Small caps have low share prices, and if one 'takes off' the returns can be enormous.