Peter Kiewit Sons', consistently one of the most profitable companies in construction, has done it again.

Kiewit says it has substantially increased its profit and revenue in 2006, according to an estimate recently filed with the Securities and Exhange Commission. The Omaha-based contractor reported net income (before earnings attributable to redeemable common stock) of $250 million, up from $228 million in 2005, on revenue of $5.03 billion, up from $4.1 billion. The price per share of the company’s stock, which is only available to employees, jumped to $56.75 in 2006 from $47.90.