Chavez now owns Cemex.
http://finance.yahoo.com/q/mh?s=CX+Major+Holders
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If you are referring the nationalization of Cemex Venezuela, that was only for the portion in Venezuela and is now a separate company than Cemex globally.
http://www.marketwatch.com/story/cemex-receives-compensation-for-nationalization-of-cemex-venezuela-2011-12-13