Shares of directory publishers Dex One Corp <DEXO.N> and SuperMedia Inc <SPMD.O> rose more than 50 percent on Tuesday after the companies said they will combine in a stock-for-stock merger.

Dex One Corp. and SuperMedia Inc., two Yellow Pages publishers, on Tuesday said they agreed to merge, with the goal of saving money in a dwindling business.Shareholders in the companies will ...