The nemesis of Wall Street’s high-frequency traders operates out of an apartment-sized office above the Bliss Salon -- manicure/pedicure $45 -- on Elm Street in the Chicago suburb of Winnetka. Staring at four computer monitors,Eric Scott Hunsader, the founder of market-data provider Nanex LLC, looks for hints of illicit trading hidden in psychedelic images of triangles dancing with dots that represent quotes to buy and sell U.S. stocks broken down by the millisecond. Charts of trading produced by Hunsader’s eight-person firm have captivated everyone from regulators to art gallery owners. One stunt involved a ... (full story)