Companhia Siderurgica To Buy Back Stock By: MarketMinute » Stock News March 14, 2014 at 09:51 AM EDT Companhia Siderurgica Nacional (NYSE: SID) will repurchase up to 70.2 million shares of company stock lifting the stock price 46 cents to close at $4.10. Related Stocks: Companhia Siderurgica Nacional ADR