Shares of Knife River Corporation (NYSE:KNF – Get Free Report) gapped down before the market opened on Tuesday after the company announced weaker than expected quarterly earnings. Knife River shares last traded at $66.4230, with a volume of 216,340 shares. Knife River had a net margin of 4.58% and a return on equity of 9.35%. Knife River Company Profile(Get Free Report)Knife River Corporation, headquartered in Bismarck, North Dakota, is a leading integrated construction materials and contracting company in the western United States. Read MoreReceive News & Ratings for Knife River Daily - Enter your email address below to receive a concise daily summary of the latest news and analysts' ratings for Knife River and related companies with MarketBeat.com's FREE daily email newsletter.