Chairman, President and Chief Executive Officer — Steven M. Klein: Northfield Bancorp's directors and executive officers ceased serving as such due to a merger.

Changes in Control of Registrant. As set forth in

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. On July 20, 2026, The NASDAQ Stock Market LLC (the “NASDAQ”) was notified that the Merger would be effective as of July 20, 2026, and it was requested that the NASDAQ (1) suspend trading of Northfield Common Stock, (2) withdraw Northfield Common Stock from listing on the NASDAQ following the closing of trading on July 20, 2026, and (3) file with the Securities and Exchange Commission (the “SEC…

Completion of Acquisition or Disposition of Assets. Pursuant to the Merger Agreement, on the Closing Date, Northfield Bancorp merged with and into Columbia Financial (the “Merger”), with Columbia Financial continuing as the surviving corporation in the Merger. Immediately following the effective time of the Merger (the “Effective Time”), Northfield Bancorp’s wholly owned banking subsidiary, Northfield Bank, merged with and into Columbia Financial’s wholly owned banking subsidiary, Columbia Ba…

Material Modifications to Rights of Security Holders. As set forth under

Other Events. The press release also announced the declaration of a $0.13 per common share cash dividend payable on May 20, 2026 to stockholders of record as of May 6, 2026.

Results of Operations and Financial Condition. On April 20, 2026, Northfield Bancorp, Inc. (the "Company") issued a press release announcing its earnings for the quarter ended March 31, 2026. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Correction of the number of restricted stock units granted to directors and employees.

The filing details the approval of equity award grants and a management cash incentive plan.

Results of Operations and Financial Condition. On February 2, 2026, Northfield Bancorp, Inc. (the “Company”) issued a press release announcing a strategic transaction and earnings for the quarter and year ended December 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Regulation FD Disclosure. The press release announcing a strategic transaction and earnings for the quarter and year ended December 31, 2025, also announced the declaration of a $0.13 per common share cash dividend payable on February 25, 2026 to stockholders of record as of February 12, 2026.

Steven Klein; William Jacobs; David Fasanella; Robin Lefkowitz; Vickie Tomasello: Executives are being terminated in connection with a Merger and receiving lump sum payments.

Entry into a Material Definitive Agreement On January 31, 2026, Northfield Bancorp, Inc., a Delaware corporation (“ Northfield ”), entered into an Agreement and Plan of Merger (the “ Merger Agreement ”) with Columbia Financial, Inc., a Delaware corporation (“ Columbia Financial ”), Columbia Financial, Inc., a newly-formed Maryland corporation (the “ Holding Company ”), and Columbia Bank MHC, the parent mutual holding company of Columbia Financial (the “ MHC ”). The Merger Agreement was unanim…

Results of Operations and Financial Condition. On October 22, 2025, Northfield Bancorp, Inc. (the "Company") issued a press release announcing its earnings for the quarter ended September 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Other Events. The press release also announced the declaration of a $0.13 per common share cash dividend payable on November 19, 2025 to stockholders of record as of November 5, 2025.

Other Events. The press release also announced the declaration of a $0.13 per common share cash dividend payable on August 20, 2025 to stockholders of record as of August 6, 2025.

Results of Operations and Financial Condition. On July 23, 2025, Northfield Bancorp, Inc. (the "Company") issued a press release announcing its earnings for the quarter ended June 30, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Other Events. On April 23, 2025, the Board of Directors of the Company approved a new $10.0 million stock repurchase program. The Company anticipates conducting such repurchases beginning on April 28, 2025 in accordance with a Rule 10b5-1 trading plan. The timing of the repurchases will depend on certain factors, including but not limited to, market conditions and prices, the Company’s liquidity and capital requirements, and alternative uses of capital. Any repurchased shares will be held as…

Results of Operations and Financial Condition. On April 23, 2025, Northfield Bancorp, Inc. (the "Company") issued a press release announcing its earnings for the quarter ended March 31, 2025. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Other Events. On February 26, 2025, the Board of Directors of Northfield Bancorp, Inc. (the “Company”) approved a new $5.0 million stock repurchase program. The Company anticipates conducting such repurchases beginning on March 3, 2025 in accordance with a Rule 10b5-1 trading plan. The timing of the repurchases will depend on certain factors, including but not limited to, market conditions and prices, the Company’s liquidity and capital requirements, and alternative uses of capital. Any repur…

The filing is about the approval and granting of equity awards to directors and employees.

Results of Operations and Financial Condition. On January 22, 2025 , Northfield Bancorp, Inc. (the “Company”) issued a press release announcing its earnings for the quarter and year ended December 31, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Other Events. The press release announcing the earnings for the quarter and year ended December 31, 2024, also announced the declaration of a $0.13 per common share cash dividend payable on February 19, 2025 to stockholders of record as of February 5, 2025.

Results of Operations and Financial Condition. On October 23, 2024, Northfield Bancorp, Inc. (the "Company") issued a press release announcing its earnings for the quarter ended September 30, 2024. A copy of the press release is attached as Exhibit 99.1 to this report. The press release attached as an exhibit to this Current Report pursuant to this

Other Events. The press release also announced the declaration of a $0.13 per common share cash dividend payable on November 20, 2024 to stockholders of record as of November 6, 2024.