Urban Dictionary adds that sigma “is what all 10 year olds think they are.” As reported by British GQ, the word “sigma” was ...

Sigma Broking, one of eight members of the London Metal Exchange allowed to trade on the open-outcry floor, is in talks to ...

Sigma became the first new floor-trading member ... Ring trading at the LME got a renewed vote of confidence in December when the British arm of U.S. broker Clear Street joined as a Category ...