Stock of Ruchi Soya rose over 7% in early trade after shares under the recently concluded follow-on public offering (FPO) started trading today. About 66.15 million new shares issued in the Rs 4,300-crore FPO began trading today. Shares of Ruchi Soya zoomed 7.78% to Rs 882.55 against the previous close of Rs 818.85 on BSE.