Argentine stocks rise as YPF shares surge By: MarketWatch March 01, 2012 at 12:49 PM EST YPF shares climb after three sessions of bruising losses, a pullback brought on by worries the oil and gas producer could be a candidate for nationalization. Read More >> Related Stocks: Repsol Ypf S.A. ADR Standard & Poors 500 Tenaris S.A. ADR Ypf Sociedad Anonima ADR