| Filed On | Filing |
|---|---|
| 12 Feb 2013 | SC 13G |
| 08 Feb 2013 | SCHEDULE 13G |
| 09 Feb 2012 | NORTHWEST NATURAL GAS ANNUAL |
| 10 Feb 2011 | SC 13G |
| 08 Dec 2010 | SC 13G |
| 29 Jan 2010 | SC 13G |
| 05 Feb 2009 | SC 13G |
| 06 Feb 2008 | SC 13G |
| 23 Jan 2007 | SC 13G |
| 10 Feb 2006 | SC 13G |
| 26 Jan 2006 | SC 13G |
| 14 Feb 2005 | SC 13G |
| 17 Feb 2004 | SC 13G |
| 12 Feb 2003 | SC 13G |
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