| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | BELL 02.16.24 | Feb 16, 2024 | Feb 15, 2024 | 001-38874 |
| 4 | Open Document | Open Filing | BELL 02.15.24 | Feb 15, 2024 | Feb 14, 2024 | 001-38874 |
| 4 | Open Document | Open Filing | BELL 02.09.24 | Feb 13, 2024 | Feb 9, 2024 | 001-38874 |
| 4/A | Open Document | Open Filing | BELL 02.23.23 A | Mar 14, 2023 | Feb 23, 2023 | 001-38874 |
| 4/A | Open Document | Open Filing | BELL 02.15.23 A | Mar 14, 2023 | Feb 15, 2023 | 001-38874 |
| 4/A | Open Document | Open Filing | BELL 02.08.23 A | Mar 14, 2023 | Feb 8, 2023 | 001-38874 |
| 4 | Open Document | Open Filing | BELL FORM 4 02.23.23 | Feb 24, 2023 | Feb 23, 2023 | 001-38874 |
| 4 | Open Document | Open Filing | BELL FORM 4 02.17.23 | Feb 17, 2023 | Feb 15, 2023 | 001-38874 |
| 4 | Open Document | Open Filing | BELL FORM 4 02.10.23 | Feb 10, 2023 | Feb 8, 2023 | 001-38874 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2022 | Feb 23, 2022 | 001-38874 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2022 | Feb 12, 2022 | 001-38874 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2022 | Feb 9, 2022 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2022 | Feb 23, 2022 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 15, 2022 | Feb 12, 2022 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 11, 2022 | Feb 9, 2022 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2021 | Feb 23, 2021 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 17, 2021 | Feb 12, 2021 | 001-38874 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2020 | Feb 14, 2020 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 14, 2020 | Feb 12, 2020 | 001-38874 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 15, 2019 | Feb 13, 2019 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2019 | Feb 8, 2019 | 000-23976 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 22, 2018 | Feb 14, 2018 | 000-23976 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 22, 2018 | Feb 8, 2018 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 16, 2018 | Feb 14, 2018 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2018 | Feb 8, 2018 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2017 | Feb 11, 2017 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2017 | Feb 8, 2017 | 000-23976 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 19, 2016 | Feb 10, 2016 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 12, 2016 | Feb 10, 2016 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2015 | Feb 11, 2015 | 000-23976 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 13, 2015 | Feb 11, 2015 | 000-23976 |