| Filed On | Filing |
|---|---|
| 02 Aug 2024 | SC 13G |
| 14 Feb 2022 | SC 13G |
| 13 Feb 2015 | SC 13G |
| 14 Feb 2014 | SC 13G |
| 21 Jan 2010 | SC 13G |
| 12 Feb 2001 | 13G - NORTHERN TECHNOLOGIES INTERNATIONAL CORP. |
| 08 Feb 2000 | 13G - NORTHERN TECHNOLOGIES INTERNATIONAL CORP. |
| 08 Dec 1999 | 13G - NORTHERN TECHNOLOGIES INTERNATIONAL CORP. |
| 12 Feb 1999 | 13G - NORTHERN TECHNOLOGIES INTERNATIONAL CORP. |
| 18 Nov 1996 | SC 13G |
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