Results of Operations and Financial Condition On July 28, 2026, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended June 30, 2026. The release also announced the declaration of a quarterly cash dividend of $0.30 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On April 28, 2026, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended March 31, 2026. The release also announced the declaration of a quarterly cash dividend of $0.29 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On January 26, 2026, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended December 31, 2025. The release also announced the declaration of a quarterly cash dividend of $0.29 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Changes in Registrant’s Certifying Accountant On January 1, 2026, Timberland Bancorp, Inc. (the “Company”) was notified that Delap LLP (“Delap”), the Company's independent registered public accounting firm, merged with Aprio, LLP effective on January 1, 2026. The combined audit practices operate as Aprio, LLP (“Aprio”). In connection with the notification of the merger, Delap has resigned as the auditors of the Company and the Audit Committee of the Company’s Board of Directors approved the a…

Chief Credit Officer — Todd Van Cise: Mr. Van Cise left to pursue other career opportunities.

Results of Operations and Financial Condition On October 30, 2025, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended September 30, 2025. The release also announced the declaration of a quarterly cash dividend of $0.28 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On July 22, 2025, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended June 30, 2025. The release also announced the declaration of a quarterly cash dividend of $0.26 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On April 22, 2025, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended March 31, 2025. The release also announced the declaration of a quarterly cash dividend of $0.26 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On January 27, 2025, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended December 31, 2024. The release also announced the declaration of a quarterly cash dividend of $0.25 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On October 31, 2024, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended September 30, 2024. The release also announced the declaration of a quarterly cash dividend of $0.25 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On July 23, 2024, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended June 30, 2024. The release also announced the declaration of a quarterly cash dividend of $0.24 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On April 23, 2024, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended March 31, 2024. The release also announced the declaration of a quarterly cash dividend of $0.24 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On January 22, 2024, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended December 31, 2023. The release also announced the declaration of a quarterly cash dividend of $0.24 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Chief Credit Officer — Edward Foster: Edward Foster retired from the Chief Credit Officer positions, and Todd Van Cise was appointed as his successor.

Chief Executive Officer, President and Chief Operating Officer, Chief Financial Officer and Executive Vice President, Chief Lending Officer and Executive Vice President — Dean J. Brydon, Jonathan A. Fischer, Marci A. Basich, Matthew J. DeBord: Several executive officers were promoted within the company and new employment agreements were entered into.

Results of Operations and Financial Condition On October 30, 2023, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended September 30, 2023. The release also announced the declaration of a quarterly cash dividend of $0.23 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Director — Michael R. Sand: Mr. Sand retired from his role as Director after a long tenure.

Results of Operations and Financial Condition On July 25, 2023, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended June 30, 2023. The release also announced the declaration of a quarterly cash dividend of $0.23 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Other Events On July 25, 2023, Timberland Bancorp, Inc. (“Company”) issued a press release announcing that its Board of Directors has authorized the repurchase of up to 5% of the Company’s outstanding shares, or 404,708 shares. The new stock repurchase program replaces the existing stock repurchase program, which had 74,212 shares available to be repurchased. A copy of the press release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Results of Operations and Financial Condition On April 25, 2023, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended March 31, 2023. The release also announced the declaration of a quarterly cash dividend of $0.23 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Chief Lending Officer — Robert Drugge: Robert Drugge retired from the Chief Lending Officer position and was succeeded by Matthew DeBord.

CEO — Michael R. Sand: Michael R. Sand retired as CEO and was succeeded by Dean J. Brydon.

Results of Operations and Financial Condition On January 23, 2023, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended December 31, 2022. The release also announced the declaration of a quarterly cash dividend of $0.23 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.

Chief Lending Officer, Chief Credit Officer, Commercial Bank Team Leader — Robert Drugge, Ed Foster, Matthew DeBord, Todd Van Cise, Carol Duris: Multiple senior executives are retiring and being replaced by internal promotions.

Results of Operations and Financial Condition On October 31, 2022, Timberland Bancorp, Inc. (the “Company”) issued its earnings release for the quarter ended September 30, 2022. The release also announced the declaration of a quarterly cash dividend of $0.22 per common share and a special cash dividend of $0.10 per common share. A copy of the earnings release is attached hereto as Exhibit 99.1, which is incorporated herein by reference.