COSTA MESA, Calif.--(BUSINESS WIRE)--D.A. Davidson & Co. (“D.A. Davidson”), a full-service investment firm with a nationwide investment banking practice, served as exclusive financial advisor to LeGrand Johnson Construction Company (“LeGrand Johnson”), an aggregates-based, vertically integrated construction materials company operating in northern and central Utah, western Wyoming and southern Idaho, in its sale to Summit Materials, Inc. (NYSE: SUM, “Summit”), a leading vertically integrated