Columbia Financial, Inc. ("Columbia Financial") (NASDAQ: CLBK), the mid-tier holding company for Columbia Bank (the "Bank"), announced today that on or about May 21, 2026 Columbia Financial, Inc., a newly formed Maryland corporation and the proposed successor holding company of the Bank ("Columbia Financial, Inc."), expects to commence its offering of common stock in connection with the proposed conversion of Columbia Bank MHC (the "MHC") from the mutual holding company to the stock holding company form of organization.

Columbia Financial, Inc., Columbia Financial and the MHC have received all requisite regulatory approvals and authorizations to commence the offering. In addition, 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., Woodbridge, New Jersey ("Northfield") and Northfield Bank immediately upon completion of the second-step conversion.

Columbia Financial, Inc. is offering for sale, on a best efforts basis, up to 192,625,000 shares of its common stock at a purchase price of $10.00 per share. The shares will be offered for sale in a subscription offering to eligible depositors and certain borrowers of the Bank and to the Bank's employee stock ownership plan. Any shares of common stock not purchased in the subscription offering may be offered for sale to the general public in a community offering, with a preference first given to natural persons residing in Bergen, Burlington, Camden, Essex, Gloucester, Middlesex, Monmouth, Morris, Passaic, Somerset and Union Counties in New Jersey and then to existing stockholders of Columbia Financial (other than Columbia Bank MHC) and to the general public. Columbia Financial, Inc. will also offer shares of common stock not purchased in the subscription offering and community offering, if any, in a firm commitment underwritten offering.