| Filed On | Filing |
|---|---|
| 03 Jul 2017 | SCHEDULE 13D/A (AMENDMENT NO. 4) |
| 01 Feb 2017 | SC 13D/A |
| 21 Aug 2015 | SCHEDULE 13D AMENDMENT NO. 2 |
| 02 Mar 2012 | SCHEDULE 13D AMENDMENT NO. 1 |
| 21 May 2004 | SC 13D/A |
| 17 Jan 2002 | ENRON CORP. FOR NORTHERN BORDER PARTNERS, L.P. |
| 06 Jan 1999 | NORTHERN PLAINS NATURAL GAS COMPANY |
| 06 Jan 1999 | ENRON CORP. FOR NORTHERN BORDER PARTNERS, L.P. |
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