Exhibit 31.2
Certification of Chief Financial Officer
Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
I, Thomas Splaine, Jr., certify that:
| 1. | I have reviewed this Amendment No. 1 to the Annual Report on Form 10-K/A of Columbia Financial, Inc. |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report. |
| Dated: April 30, 2026 | /s/ Thomas Splaine, Jr. | |||||
| Thomas Splaine, Jr. | ||||||
| Executive Vice President and Chief Financial Officer | ||||||
| (principal financial and accounting officer) |