Insider Activity of Stumpf John P
The largest purchase of all time was on 2007-08-28 and amounted to 376 shares of MDU Resources Group, Inc. for $10,000.
The largest sale of all time was on 2008-05-23 and amounted to 10884 shares of MDU Resources Group, Inc. for $344,113.
Biography of Stumpf John P
No biography is available at this moment.