Page 1

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Fiscal Year Ended September 30 , 2021 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE ☐ SECURITIES EXCHANGE ACT OF 1934 OR Commission File Number : 0-23333 TIMBERLAND BANCORP , INC . ( Exact name of registrant as specified in its charter ) Washington ( State or other jurisdiction of incorporation or organization ) 624 Simpson Avenue , Hoquiam , Washington ( Address of principal executive offices ) Registrant's telephone number , including area code : Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class ☑ No 91-1863696 ( I.R.S. Employer Identification Number ) 98550 ( Zip Code ) ( 360 ) 533-4747 Common stock , $ .01 par value Trading Symbol ( s ) TSBK Name of each exchange on which registered The NASDAQ Stock Market LLC Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes ☐ No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes ☐ ☑ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ✓ No □ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) Yes ✓ No ☐ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , " " accelerated filer , ” “ smaller reporting company ” and " emerging growth company " in Rule 12b - 2 of the Exchange Act : Large accelerated filer Non - accelerated filer Emerging growth company ☐ ☐ Accelerated filer Smaller reporting company ☐ ☑ If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . [ □ ] Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes ☐ No ☑ As of December 2 , 2021 the registrant had 8,354,717 shares of common stock issued and outstanding . The aggregate market value of the common stock held by nonaffiliates of the registrant , based on the closing sales price of the registrant's common stock as quoted on the