The Weitz Co. ranks No. 65 among the top 400 construction companies in the country, based on $828.5 million in 2012 revenues, according to the May 20 issue of Engineering News-Record. Des Moines-based Weitz, which was bought late last year by international construction conglomerate Orascom Construction Industries, slipped from 57th place in 2011, when it reported revenues of $889 million. Among other companies with a strong Iowa presence, JE Dunn Construction Group saw revenues increase to $2.2 billion last year, but slipped two spots in the rankings to No. 28, and Ryan Companies US Inc. ranked 88th, down from 79th in 2011, with revenues of $658 million. JE Dunn's Iowa operations are based in West Des Moines. Ryan has an office in Clive. These Iowa-based companies also made the list: Klinger Cos. Inc. of Sioux City dropped to No. 209, down four places, with revenues of $275 million; McCarthy Improvement Co. of Davenport was added to the list at No. 364 based on revenues of nearly $142 million; and Conlon Construction Co. of Dubuque was No. 391, with revenues of nearly $120 million.