UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended December 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Transition Period from _____ to _____. Commission file number 000-23333 TIMBERLAND BANCORP, INC. (Exact name of registrant as specified in its charter) Washington 91-1863696 (State or other ...

Financial Data and Key Metrics Changes - Net income for fiscal 2025 reached $29.2 million, an all-time record, and increased by $4.9 million compared to fiscal 2024 [9] - Earnings per share (EPS) for fiscal 2025 was $3.67, also a record, representing a 22% increase from fiscal 2024 [9] - Return on assets for fiscal 2025 was 1.5%, and return on equity was 11.56%, both favorable compared to peers [10] - Total assets grew by 5% in 2025, surpassing the $2 billion mark [10] - Total capital was over $268 million at the end of the most recent quarter, with strong capital ratios exceeding regulatory requirements [10][11] Business Line Data and Key Metrics Changes - Total deposits increased by 5% in 2025 after a 4% decrease in fiscal 2023 and a 6% increase in 2024 [12] - The loan portfolio increased by 51% since 2021, although growth has flattened recently due to increased loan payoffs [13] - Non-performing assets were only 23 basis points of total assets at the end of the most recent quarter, indicating strong asset quality [16] Market Data and Key Metrics Changes - The banking industry faced significant challenges in 2023 and 2024, including deposit outflows and margin compression, but 2025 showed improvement with a more favorable yield curve [8] - Timberland's stock outperformed the Nasdaq Bank Index and the KBW Regional Bank Index over the past five years, with the stock price increasing from $29.52 to $37.42 [19] Company Strategy and Development Direction - The company opened a new branch in University Place, Washington, to better serve local customers and expand its footprint [21][23] - Timberland is focusing on enhancing technology resources, including online banking and partnerships with fintechs, to improve customer engagement and operational efficiency [26][29] - The company is committed to maintaining a strong presence in mortgage banking, despite challenges faced by other community banks [27] Management's Comments on Operating Environment and Future Outlook - Management acknowledged the challenges faced by the banking industry in recent years but expressed optimism about the recovery and improved profitability in 2025 [8] - The company is focused on community engagement and has been actively supporting local food banks and nonprofits [25] Other Important Information - The quarterly cash dividend was increased to $0.29 per share, marking the 53rd consecutive quarter of dividend payments [11] - The company has implemented effective fraud controls to address rising fraud concerns in the banking sector [28] Q&A Session Summary Question: Are there any questions from shareholders? - No questions were submitted during the meeting [32]

Financial Data and Key Metrics Changes - Net income for fiscal 2025 reached $29.2 million, an all-time record, and $4.9 million higher than fiscal 2024 [9] - Earnings per share (EPS) for fiscal 2025 was $3.67, also a record, representing a 22% increase from fiscal 2024 [9] - Return on assets was 1.5% and return on equity was 11.56% for fiscal 2025, both favorable compared to peers [10] - Total assets grew by 5% in 2025, surpassing the $2 billion mark [10] - Total capital was over $268 million at the end of the most recent quarter, with strong capital ratios exceeding regulatory levels [10][11] - Quarterly cash dividend increased to $0.29 per share, marking the 53rd consecutive quarter of dividend payments [11] Business Line Data and Key Metrics Changes - Total deposits increased by 5% in 2025 after a 4% decrease in fiscal 2023 and a 6% increase in 2024 [12] - The loan portfolio increased by 51% since 2021, although growth has flattened recently due to increased loan payoffs [13] - Non-performing assets were only 23 basis points of total assets at the end of the most recent quarter, indicating strong asset quality [16] Market Data and Key Metrics Changes - The banking industry faced significant challenges in 2023 and 2024, including deposit outflows and margin compression, but 2025 showed improvement with a more favorable yield curve [8] - Timberland's stock outperformed the Nasdaq Bank Index and the KBW Regional Bank Index over the past five years, with the stock price increasing from $29.52 to $37.42 [19] Company Strategy and Development Direction - The company opened a new branch in University Place, Washington, to better serve local customers and expand its footprint [21][23] - Continued focus on enhancing technology resources, including online banking and partnerships with Fintechs, to improve customer engagement [26] - Commitment to maintaining a strong presence in mortgage banking despite industry trends of other community banks reducing their mortgage operations [27] Management's Comments on Operating Environment and Future Outlook - Management acknowledged the challenges faced by the banking industry in recent years but expressed optimism about the recovery and improved profitability in 2025 [8] - The company is focused on community engagement and supporting local nonprofits, which has been particularly important during increased demand for food bank services [25] Other Important Information - The company has implemented effective fraud controls to address rising fraud concerns in the banking sector [28] - Plans to enhance customer statements and introduce digital debit cards for immediate issuance [29] Q&A Session Summary Question: Were there any questions submitted during the meeting? - No questions were submitted during the meeting [32]

Financial Data and Key Metrics Changes - Net income for fiscal 2025 was $29.2 million, an all-time record, and $4.9 million higher than fiscal 2024 [9] - Earnings per share (EPS) for fiscal 2025 was $3.67, also an all-time record, representing a 22% increase from fiscal 2024 [9] - Return on assets for fiscal 2025 was 1.5%, and return on equity was 11.56%, both favorable compared to peers [10] - Total assets grew by 5% in 2025, surpassing the $2 billion mark [10] - Total capital was over $268 million at the end of the most recent quarter, with strong capital ratios exceeding regulatory levels [10][11] - Cash dividend increased to $0.29 per share, marking the 53rd consecutive quarter of dividend payments [11] Business Line Data and Key Metrics Changes - Total deposits increased by 5% in 2025 after a 4% decrease in fiscal 2023 and a 6% increase in 2024 [12] - The loan portfolio increased by 51% since 2021, although growth has flattened recently due to increased loan payoffs [13] - Non-performing assets were only 23 basis points of total assets at the end of the most recent quarter, indicating strong asset quality [15] Market Data and Key Metrics Changes - The banking industry faced significant challenges in 2023 and 2024, including deposit outflows and margin compression, but 2025 showed improvement with a more favorable yield curve [8] - Timberland Bancorp's stock outperformed the Nasdaq Bank Index and the KBW Regional Bank Index over the past five years, with the stock price increasing from $29.52 to $37.42 [18] Company Strategy and Development Direction - The company is focused on expanding its branch network, recently opening a new branch in University Place, Washington, to better serve local customers [20] - There is an emphasis on enhancing technology resources, including online banking and partnerships with Fintechs to improve customer engagement [24] - The company aims to maintain a strong focus on community service, supporting local food banks and nonprofits [22] Management's Comments on Operating Environment and Future Outlook - Management acknowledged the challenges faced by the banking industry in recent years but expressed optimism about the recovery and improved profitability in 2025 [8] - The company is committed to maintaining effective fraud controls and enhancing customer service through technology improvements [25][26] Other Important Information - The company has a diversified loan portfolio, with commercial real estate loans being the largest category at 39% [14] - The efficiency ratio remains favorable compared to peer groups, reflecting effective expense management [17] Q&A Session Summary - No questions were submitted during the Q&A session [29]

Exhibit 99.1 Contact:Dean J. Brydon, CEO Jonathan A. Fischer, President & COO Marci A. Basich, CFO (360) 533-4747 www.timberlandbank.com Timberland Bancorp Reports First Fiscal Quarter Net Income of $8.2 Million HOQUIAM, WA – January 26, 2026 – Timberland Bancorp, Inc. (NASDAQ: TSBK) ("Timberland" or "the Company"), the holding company for Timberland Bank (the "Bank"), today reported net income of $8.22 million, or $1.04 per diluted common share for the quarter ended December 31, 2025. This compares to net ...

EPS Increases 21% to $1.04 from $0.86 for the Comparable Quarter One Year AgoQuarterly Return on Average Assets of 1.60%Quarterly Return on Average Equity of 12.33%Quarterly Net Interest Margin Increases to 3.85%Announces a 4% Increase in the Quarterly Cash Dividend HOQUIAM, Wash., Jan. 26, 2026 (GLOBE NEWSWIRE) -- Timberland Bancorp, Inc. (NASDAQ: TSBK) (“Timberland” or “the Company”), the holding company for Timberland Bank (the “Bank”), today reported net income of $8.22 million, or $1.04 per diluted com ...

Financial Reporting and Accounting Standards - The company adopted the CECL model on October 1, 2023, which requires financial assets to be presented at the net amount expected to be collected, potentially increasing earnings volatility due to macroeconomic variables [268]. - Future adjustments under the CECL model could materially impact the company's results of operations and financial condition, especially under volatile economic conditions [269]. - The implementation of the CECL model on October 1, 2023, requires forward-looking estimates of expected credit losses, potentially increasing earnings volatility [268]. - Regulatory changes in accounting standards may necessitate adjustments in financial reporting, affecting profitability and risk exposure [266]. Risk Management and Exposure - The company is exposed to a broad range of risks, including liquidity, credit, and market risks, which could result in substantial and unexpected losses if risk management proves ineffective [278]. - Changes in interest rates could materially affect the company's financial condition, liquidity, and results of operations, as interest rate risk modeling may not fully capture actual impacts [238]. - The company's risk management framework may not effectively mitigate risks, potentially leading to substantial and unexpected losses [278]. - Increased incidents of fraud and financial crimes have been reported, leading to potential financial losses and reputational damage [257]. - Cybersecurity threats remain a significant concern, with potential impacts on operations and customer trust if breaches occur [260]. Liquidity and Capital Management - The company may face challenges in liquidity management, which is essential for operations, and any decline in available funding could adversely affect its ability to originate loans and meet obligations [276]. - The company is required to maintain adequate levels of capital, and its ability to raise additional capital may be affected by market conditions and financial performance [277]. - A decline in available funding could impair the company's ability to originate loans and meet operational expenses, leading to material adverse effects [276]. - The company may need to raise additional capital in the future, which may not be available or could be costly, impacting expansion and financial condition [277]. Asset Management and Valuation - As of September 30, 2025, the company's loan servicing rights totaled $815,000, which are sensitive to changes in prepayment speeds and market interest rates [270]. - Loan servicing rights totaled $815,000 as of September 30, 2025, with fair value highly sensitive to changes in prepayment speeds and interest rates [270]. - The company's commercial real estate loans represented 283.05% of total capital as of September 30, 2025, indicating a significant concentration that may attract regulatory scrutiny [242]. - The company may face reduced earnings if real estate investments are not properly valued or if valuation allowances need to be increased [272]. - Bank regulators may require the company to recognize further valuation allowances on Other Real Estate Owned (OREO), potentially adversely affecting financial results [273]. Market and Economic Conditions - The financial services market is rapidly evolving with technological changes, necessitating investments in digital banking and AI to remain competitive [251]. - Climate change poses risks to financial condition due to potential damage to collateral and adverse effects on regional economic activity [249]. - As of September 30, 2025, approximately 0.9% of total deposits were from legal cannabis-related businesses, impacting non-interest income and profitability [245]. - The company's securities portfolio may be negatively impacted by fluctuations in market value and interest rates, which could lead to credit-related losses [240]. Compliance and Regulatory Risks - Non-compliance with anti-money laundering regulations could result in fines, sanctions, and limitations on strategic transactions, adversely affecting financial condition [247]. - Future goodwill impairment could occur, impacting earnings due to the subjective nature of fair value assessments [265]. - The company is dependent on key personnel, and the loss of such personnel may adversely affect its prospects [279].

Core Insights - Timberland Bancorp, Inc. (TSBK) is characterized as a well-run and stable bank that has effectively managed various interest rate environments in recent years [1] - The bank has experienced accelerated profitability over the last two fiscal years, attributed to the prevailing interest rate conditions [1] Company Performance - The bank's ability to navigate different interest rate regimes has been highlighted as a key strength [1] - Profitability has shown significant improvement, indicating a positive trend in financial performance [1]

Financial Performance - Timberland Bancorp's net income for the fiscal year 2025 increased 20% to $29.16 million from $24.28 million in 2024[2] - Earnings per diluted common share (EPS) rose 22% to $3.67 for fiscal year 2025, compared to $3.01 for fiscal year 2024[2] - For Q4 2025, net income was $8.45 million, a 19% increase from the previous quarter and a 33% increase year-over-year[3][11] - Net income for Q4 2025 was $8,447 million, representing a 19.0% increase from $7,100 million in Q3 2025 and a 33.0% increase from $6,355 million in Q4 2024[39] - Net income rose to $29,161,000 for the year ended September 30, 2025, compared to $24,283,000 in 2024, reflecting a growth of 20.0%[40] Asset and Deposit Growth - Total assets surpassed $2 billion for the first time, increasing 3% from the prior quarter and 5% year-over-year[11][17] - Total assets reached $2,012,779,000 as of September 30, 2025, up from $1,923,475,000 a year earlier, marking a growth of 4.6%[41] - Total deposits increased by $47 million, or 3%, with a notable growth in non-interest-bearing balances[4][11] - Total deposits grew to $1,716,635,000 as of September 30, 2025, compared to $1,647,668,000 in 2024, an increase of 4.2%[41] Loan Performance - Total loans receivable, net increased to $1,463,590 thousand at September 30, 2025, up from $1,441,496 thousand at June 30, 2025, and $1,421,523 thousand at September 30, 2024[20] - Timberland originated $100.09 million in loans during the quarter ended September 30, 2025, compared to $81.99 million for the preceding quarter and $48.82 million for the comparable quarter one year ago[23] - Total loans increased to $4,407 million in Q4 2025, up 14.7% from $3,843 million in Q3 2025 and up 13.4% from $3,885 million in Q4 2024[34] Income and Expense Analysis - Non-interest income for Q4 2025 increased 42% to $4.09 million, driven by a $1.04 million bank-owned life insurance death benefit claim[14] - Total interest and dividend income reached $26,611 million in Q4 2025, an increase of 4.2% from $25,544 million in Q3 2025 and 6.3% from $25,035 million in Q4 2024[39] - Total non-interest expense rose to $11,959 million in Q4 2025, compared to $11,167 million in Q3 2025 and $11,062 million in Q4 2024[39] Efficiency and Ratios - The efficiency ratio improved to 53.18% in Q4 2025, down from 54.48% in the previous quarter and 56.79% year-over-year[11][15] - Return on average assets improved to 1.68% in Q4 2025, up from 1.32% in Q4 2024[42] - The allowance for credit losses for loans as a percentage of loans receivable was 1.22% at September 30, 2025, compared to 1.23% at June 30, 2025[31] Capital and Shareholder Value - Total shareholders' equity increased by $5.95 million, or 2%, to $262.61 million at September 30, 2025, driven by net income of $8.45 million[29] - Basic net income per common share was $1.07 in Q4 2025, up from $0.90 in Q3 2025 and $0.80 in Q4 2024[39] - Book value per common share increased to $33.29 in Q4 2025 from $30.83 in Q4 2024, reflecting a growth of 8.0%[42] Future Outlook and Risks - The company anticipates potential risks including economic conditions, inflation, and regulatory changes that may impact future performance[36] - Timberland plans to open a new full-service branch in University Place, enhancing its market presence[6]

Core Insights - Timberland Bancorp, Inc. reported a 20% increase in net income to $29.16 million for the fiscal year ended September 30, 2025, compared to $24.28 million for the previous year, with earnings per diluted share rising 22% to $3.67 from $3.01 [1][9] - The company achieved record results for the fiscal year, with year-over-year gains across all major profitability measures, and announced an 8% increase in the quarterly cash dividend to $0.28 per share [3][4] Financial Performance - For the quarter ended September 30, 2025, net income was $8.45 million, or $1.07 per diluted share, up 19% from the previous quarter and 33% from the same quarter last year [2][9] - Operating revenue for the current quarter increased 10% to $22.49 million from $20.50 million in the preceding quarter, and 15% from $19.48 million a year ago [7] - Net interest income rose 4% to $18.40 million for the current quarter, and 11% year-over-year [8][11] Balance Sheet Highlights - Total assets surpassed $2 billion for the first time, increasing 3% from the prior quarter and 5% year-over-year [3][9] - Total deposits increased by $47 million, or 3%, to $1.72 billion, with significant growth in non-interest-bearing balances [21][22] - The non-performing assets ratio increased slightly to 0.23% from 0.21% in the prior quarter, but overall credit quality remains solid [26][27] Dividend and Shareholder Returns - The Board of Directors announced an 8% increase in the quarterly cash dividend, marking the 52nd consecutive quarter of dividend payments [3][4] - Shareholders' equity increased by 2% to $262.61 million, driven by net income and stock option exercises [24][25] Strategic Initiatives - The company plans to open a new full-service branch in University Place, enhancing its market presence and commercial banking relationships [3][4] - Timberland originated $100.09 million in loans during the quarter, a significant increase from previous periods [19]