| Date | Name | Symbol | Type | Security | Shares | Price | Value | Ownership | Reported |
| 06/30/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common Stock | 854 | $18.25 | $15.6k | | 06/30/2023 |
| 02/28/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 1.7k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 1.5k | $0.00 | $0 | | 02/28/2023 |
| 02/28/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 1k | $0.00 | $0 | | 02/28/2023 |
| 02/21/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 1.5k | $0.00 | $0 | | 02/21/2023 |
| 02/21/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 609 | $30.77 | $18.7k | | 02/21/2023 |
| 02/21/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 7.9k | $0.00 | $0 | | 02/21/2023 |
| 02/21/2023 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 3.9k | $0.00 | $0 | | 02/21/2023 |
| 12/30/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 232 | $26.84 | $6.2k | | 12/30/2022 |
| 06/30/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 446 | $25.79 | $11.5k | | 06/30/2022 |
| 03/25/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 188 | $34.07 | $6.4k | | 03/25/2022 |
| 03/07/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 385 | $32.72 | $12.6k | | 03/07/2022 |
| 03/07/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 1.6k | $32.72 | $52.1k | | 03/07/2022 |
| 02/28/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 289 | $36.63 | $10.6k | | 02/28/2022 |
| 02/15/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 470 | $36.75 | $17.3k | | 02/15/2022 |
| 02/15/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 600 | $36.75 | $22k | | 02/15/2022 |
| 01/04/2022 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 186 | $29.45 | $5.5k | | 01/04/2022 |
| 07/06/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 304 | $31.64 | $9.6k | | 07/06/2021 |
| 03/26/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 126 | $45.11 | $5.7k | | 03/26/2021 |
| 03/18/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 2.4k | $0.00 | $0 | | 03/18/2021 |
| 03/18/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 576 | $35.90 | $20.7k | | 03/18/2021 |
| 02/26/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 161 | $44.29 | $7.1k | | 02/26/2021 |
| 02/22/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 255 | $45.93 | $11.7k | | 02/22/2021 |
| 02/15/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 621 | $43.09 | $26.8k | | 02/15/2021 |
| 01/07/2021 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 219 | $24.06 | $5.3k | | 01/07/2021 |
| 07/02/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 337 | $25.51 | $8.6k | | 07/02/2020 |
| 02/28/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 114 | $33.20 | $3.8k | | 02/28/2020 |
| 02/27/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 459 | $40.69 | $18.7k | | 02/27/2020 |
| 02/27/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 2k | $40.69 | $79.5k | | 02/27/2020 |
| 02/27/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 2k | $0.00 | $0 | | 02/27/2020 |
| 02/24/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 320 | $37.48 | $12k | | 02/24/2020 |
| 02/21/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Payment of Exercise | Common | 152 | $38.69 | $5.9k | | 02/21/2020 |
| 01/03/2020 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 137 | $32.81 | $4.5k | | 01/03/2020 |
| 07/01/2019 | COLUMBIA BANKING SYSTEM, INC. | COLB | Purchase | Common | 259 | $32.56 | $8.4k | | 07/01/2019 |
| 03/27/2019 | COLUMBIA BANKING SYSTEM, INC. | COLB | Grant | Common | 2.6k | $32.01 | $82.4k | | 03/27/2019 |
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