Dominion Resources, Inc.'s ( D ) subsidiary, a Delaware limited partnership Dominion Midstream Partners, LP (Dominion Midstream) announced the pricing of its initial public offering of 17.5 million common units. The units representing limited partner interest in Dominion Midstream were priced at $21 per unit. Dominion Midstream also offered the underwriters a window of 30 days to purchase up to an additional 2.625 million units at the same price.