| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 28 May 2021 | 26 May 2021 | 001-35873 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 01 Jun 2020 | 28 May 2020 | 001-35873 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 31 May 2019 | 29 May 2019 | 001-35873 |
| 3 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 04 Feb 2019 | 01 Feb 2019 | 001-35873 |