X0609 4 2026-07-20 1 0001493225 Northfield Bancorp, Inc. NFBK 0001409460 Klein Steven M false 581 MAIN STREET, SUITE 810 WOODBRIDGE NJ 07095 1 1 0 0 Chairman, President & CEO 0 Common Stock 2026-07-20 4 D 0 464261 D 0 D Common Stock 2026-07-20 4 D 0 66997.09 D 0 I By 401(k) Common Stock 2026-07-20 4 D 0 59118.88 D 0 I By ESOP Stock Options 16.89 2026-07-20 4 D 0 40000 D 2018-11-01 2027-11-01 Common Stock 40000 0 D Pursuant to the Agreement and Plan of Merger dated as of January 31, 2026, by and among Columbia Financial, Inc., a Delaware corporation, Columbia Financial, Inc., a Maryland corporation (Newco), Columbia Bank MHC and Northfield Bancorp, Inc. (Merger Agreement), at the effective time of the merger between Northfield Bancorp, Inc, and Newco, each issued and outstanding share of Northfield Bancorp, Inc. common stock was converted into the right to receive, at the election of the holder, either (i) 1.425 shares of Newco common stock or (ii) $14.25 in cash. Pursuant to the Merger Agreement, each outstanding and unexercised option immediately prior to the effective time of the merger, whether vested or unvested, was converted into an option exercisable for a total number of shares of Newco common stock equal to the total number of shares underlying the Northfield Bancorp, Inc. option multiplied by 1.425, rounded down to the nearest whole share, with an exercise price per share equal to the exercise price applicable to the underlying Northfield Bancorp, Inc. option divided by 1.425, rounded up to the nearest cent. /s/ William R. Jacobs, pursuant to Power of Attorney 2026-07-20