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Sigma Capital tumbles on trading update

Shares in Sigma Capital plunged 13% after the investment company announced big write-downs in the value of its portfolio wiping even more off the value of Sir Tom Hunter�s stake in the business.

Shares in Sigma Capital plunged 13% after the investment company announced big write-downs in the value of its portfolio wiping even more off the value of Sir Tom Hunter's stake in the business.