The Supreme Court has dismissed a plea by the by the Securities and Exchange Board of India (SEBI) to impose a Rs 25 crore penalty against Mukesh Ambani, Chairman and Managing Director of Reliance Industries Ltd (RIL), on Monday in a 2007 case related to alleged manipulative trades in shares of the erstwhile Reliance Petroleum (RPL), a listed subsidiary of RIL that was merged into RIL in the year 2009.