| Filed On | Filing |
|---|---|
| 14 Feb 2022 | SCHEDULE 13G/A |
| 10 Feb 2022 | ADVANCED EMISSIONS SOLUTIONS, INC. |
| 12 Jul 2021 | SC 13G/A |
| 10 Feb 2021 | SCHEDULE 13G/A |
| 29 Jan 2021 | SC 13G/A |
| 09 Oct 2020 | SC 13G/A |
| 13 Feb 2020 | SC 13G/A |
| 12 Feb 2020 | SCHEDULE 13G/A |
| 04 Feb 2020 | SC 13G/A |
| 14 Feb 2019 | SC 13G/A |
| 13 Feb 2019 | SC 13G/A |
| 24 Jan 2019 | SC 13G/A |
| 14 Feb 2018 | SC 13G/A |
| 14 Feb 2018 | 13G/A |
| 19 Jan 2018 | SC 13G/A |
| 14 Feb 2017 | 13G/A |
| 12 Jan 2017 | SC 13G/A |
| 11 Feb 2016 | SEC SCHEDULE 13G |
| 08 Jan 2016 | SC 13G/A |
| 27 Aug 2015 | AMENDMENT NO. 1 |
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