MDU Resources Group (NYSE: MDU) has a market capitalization of $3.98B. Last close $19.10 (as of 2026-10-21); 52-week range $18.24 to $22.98. ORTEX data as of 2026-10-19: short interest is 8.96% of free float, 10.7 days to cover and the average cost to borrow is 0.49%.