FORM 10-K FOR THE PERIOD ENDED 12/31/2008

Company

MDU RESOURCES GROUP INC

Filed

February 13, 2009

Period of Report

December 31, 2008

Accession Number

0000067716-09-000026

A 10-K is a company's comprehensive annual report, required by the SEC. It includes audited financial statements, a description of the business, risk factors, and management's discussion of results. Learn more about 10-K filings →