Vanguard Natural Resources, a natural gas company focused on the acquisition and exploitation of mature properties, priced 5.25 million shares at $19, the low end of its revised $19-$21 range. The offer price represents a 17% discount to the midpoint of its originally proposed $22-$24 range. Citi managed the deal for the Houston-based company. The stock is expected to begin trading on the NYSE Arca Exchange on Wednesday under the ticker VNR.

