| 4 | Statement of changes in beneficial ownership of securities | August 7, 2020 | |
| 4 | Statement of changes in beneficial ownership of securities | August 6, 2020 | |
| 4 | Statement of changes in beneficial ownership of securities | August 6, 2020 | |
| 8-K | Current report | August 3, 2020 | |
| SC 13G | Statement of acquisition of beneficial ownership by individuals | July 7, 2020 | |
| 8-K | Current report | July 6, 2020 | |
| EFFECT | Notice of Effectiveness | June 3, 2020 | |
| S-1/A | General form for registration of securities under the Securities Act of 1933 | June 2, 2020 | |
| S-1/A | General form for registration of securities under the Securities Act of 1933 | June 2, 2020 | |
| 8-K | Current report | June 2, 2020 | |