| Filed On | Filing |
|---|---|
| 30 May 2024 | SC 13G |
| 12 Feb 2021 | SC 13G |
| 28 Dec 2020 | ADVANCED EMISSIONS SOLUTIONS, INC. |
| 11 Feb 2019 | SC 13G |
| 11 Feb 2019 | SC 13G |
| 12 Feb 2018 | SC 13G |
| 12 May 2017 | SC 13G |
| 07 Feb 2017 | SC 13G |
| 27 Apr 2015 | SCHEDULE 13G HOLDINGS REPORT |
| 13 Feb 2015 | SC 13G |
| 04 Feb 2015 | SC 13G |
| 13 May 2014 | SC 13G |
| 14 Feb 2014 | DISCLOSURE DOCUMENT |
| 09 Aug 2013 | SC 13G |
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