Columbia Financial, Inc.

false 0001723596 0001723596 2020-07-29 2020-07-29 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of Earliest Event Reported): May 11, 2026 Columbia Financial, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38456 22-3504946 (State or other jurisdiction (Commission (IRS Employer of incorporation) File Number) Identification Number) 19-01 Route 208 North , Fair Lawn , New Jersey 07410 (Address of principal executive offices) ( 800 ) 522-4167 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading symbol(s) Name of each exchange on which registered Common stock, $0.01 par value per share CLBK The Nasdaq Stock Market LLC Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If 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. ☐ Item 8.01 Other Events On May 11, 2026, Columbia Financial, Inc., a Delaware corporation, (“ Columbia Financial ”) issued a press release announcing that Columbia Financial, Inc., a newly formed Maryland corporation (“ Columbia Financial, Inc . ) and the proposed successor holding company of Columbia Bank, is commencing its offering of common stock on or about May 21, 2026 in connection with the proposed second-step conversion of Columbia Bank MHC from the mutual holding company to the stock holding company form of organization. The press release also announced that Columbia Financial, Inc. and Columbia Bank have received conditional approval of the Board of Governors of the Federal Reserve System and the Office of the Comptroller of the Currency to acquire Northfield Bancorp, Inc. and Northfield Bank immediately upon completion of the second-step conversion. A copy of the press release is filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits (d) Exhibits Exhibit Number Description 99.1 Press release dated May 11, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunder duly authorized. Date: May 11, 2026 /s/Dennis E. Gibney Dennis E. Gibney 1 st Senior Executive Vice President, Chief Banking Officer 3