| Filed On | Filing |
|---|---|
| 17 Nov 2021 | SC 13G |
| 08 Apr 2020 | SC 13G |
| 01 Oct 2018 | SC 13G |
| 10 Feb 2017 | SC 13G |
| 09 Feb 2017 | SCHEDULE 13G |
| 09 Feb 2016 | SCHEDULE 13G |
| 12 Feb 2013 | SC 13G |
| 13 Feb 2012 | SCHEDULE 13G |
| 10 Feb 2011 | SC 13G |
| 07 Jan 2008 | JANUARY 7, 2008 |
| 24 Oct 2005 | NELNET, INC. |
| 13 Feb 2004 | SCHEDULE 13G |
| 13 Feb 2004 | SCHEDULE 13G |
| 13 Feb 2004 | SCHEDULE 13G |
| 13 Feb 2004 | SCHEDULE 13G |
| 13 Feb 2004 | SCHEDULE 13G |
| 13 Feb 2004 | SCHEDULE 13G |
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