Companhia Siderurgica To Buy Back Stock By: MarketMinute.com Stock News March 14, 2014 at 16:51 PM 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