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STATES SECURITIES AND EXCHANGE COMMISSION\n\nWashington, D.C. 20549\n\nFORM 10-Q/A\n\n(Amendment No. 1)\n\n(Mark one)\n\n☒QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nFor the quarterly period ended March 31, 2026\n\nor\n\n☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934\n\nCommission File Number 001-38456\n\nColumbia Financial, Inc.\n\n(Exact name of registrant as specified in its charter)\n\nDelaware\n22-3504946\n\n(State or other jurisdiction\nof incorporation or organization)(I.R.S. Employer Identification Number)\n\n19-01 Route 208 North\n\nFair Lawn, New Jersey\n07410\n\n(Address of principal executive offices)(Zip Code)\n\n(800) 522-4167\n\n(Registrant’s telephone number, including area code)\n\nSecurities registered pursuant to Section 12(b) of the Act:\n\nTitle of each classTrading symbol(s)Name of each exchange on which registered\n\nCommon Stock, $0.01 par value per share CLBKThe Nasdaq Stock Market LLC\n\nIndicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days.\n\n☒ Yes ☐ No\n\nIndicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).\n\n☒ Yes ☐ No\n\nIndicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act:\n\nLarge accelerated filer☐Accelerated filer☒Smaller reporting company☐\n\nNon-accelerated filer☐Emerging growth company☐\n\nIf an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐\n\nIndicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).\n\n☐ Yes ☒ No\n\nAs of June 5, 2026, there were 104,058,235 shares issued and outstanding of the Registrant's common stock, par value $0.01 per share (including 76,016,524 shares held by Columbia Bank, MHC).\n\nExplanatory Note\n\nThe sole purpose of this Amendment No. 1 to the Quarterly Report on Form 10-Q of Columbia Financial, Inc., a Delaware corporation (the “Company”), for the quarter ended March 31, 2026 filed with the Securities and Exchange Commission on May 11, 2026 (the “Form 10-Q”) is to furnish the correct versions of Exhibit 31.2 and Exhibit 32 (together, the “Exhibits”) to the Form 10-Q. Each of the Exhibits included in the original filing of the Form 10-Q inadvertently referred to the Company’s First Senior Executive Vice President and Chief Banking Officer, instead of the Company’s Executive Vice President and Chief Financial Officer, as the Company’s principal financial and accounting officer in the introductory paragraph to the Exhibit. This Amendment No. 1 to the Form 10-Q is filed solely to include the correct version of each of the Exhibits and does not otherwise amend any of the disclosures or financial information set forth in the Form 10-Q as originally filed.\n\nCOLUMBIA FINANCIAL, INC. AND SUBSIDIARIES\n\nIndex to Form 10-Q                                \n\nItem Number\nPage Number\n\nPART I.\nFinancial Information"}