HOUSTON, April 15, 2011 /PRNewswire/ -- Kirby Corporation ("Kirby") (NYSE: KEX ) announced today the completion of the purchase of United Holdings LLC ("United"), a distributor and service provider of engine and transmission related products for the oil and gas services, power generation and transportation industries, and manufacturer of oilfield service equipment. The base purchase price was $270 million in cash, before post-closing adjustments. The purchase was financed using Kirby's existing cash and revolving credit facility.