# EDGAR Filing Document

**Accession Number:** 0001046050
**File Stem:** 0000939057-26-000011
**Filing Date:** 2026-1
**Character Count:** 9242
**Document Hash:** 791021c81b6f0f1d16d280706120290d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000939057-26-000011.hdr.sgml**: 20260114

**ACCESSION NUMBER**: 0000939057-26-000011

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260113

**FILED AS OF DATE**: 20260114

**DATE AS OF CHANGE**: 20260114

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Seath Matthew Douglas
- **CENTRAL INDEX KEY:** 0002104858

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-23333
- **FILM NUMBER:** 26531534

**MAIL ADDRESS:**
- **STREET 1:** 624 SIMPSON AVENUE
- **CITY:** HOQUIAM
- **STATE:** WA
- **ZIP:** 98550
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TIMBERLAND BANCORP INC
- **CENTRAL INDEX KEY:** 0001046050
- **STANDARD INDUSTRIAL CLASSIFICATION:** SAVINGS INSTITUTIONS, NOT FEDERALLY CHARTERED [6036]
- **ORGANIZATION NAME:** 02 Finance
- **EIN:** 911863696
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 0930

**BUSINESS ADDRESS:**
- **STREET 1:** 624 SIMPSON AVE
- **CITY:** HOQUIAM
- **STATE:** WA
- **ZIP:** 98550
- **BUSINESS PHONE:** 3605334747

**MAIL ADDRESS:**
- **STREET 1:** 624 SIMPSON AVE
- **CITY:** HOQUIAM
- **STATE:** WA
- **ZIP:** 98550

## Ex-24

**Exhibit 24**<br>

**** 

POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Marci Basich and Cheryl Parks, signing singly, the undersigned's true and lawful attorney-in-fact to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and / or director of Timberland Bancorp, Inc., ("TSBK"), Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934 and the rules thereunder;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3,4 or 5 and timely file such form with the United States Securities and Exchange Commission and any stock exchange or similar authority; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute and substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and powers herein granted. The "undersigned" acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is TSBK assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 with respect to the undersigned's holdings of and transactions in securities issued by TSBK, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to he executed as of this 11th day of December 2025. <br>

---

| |
|:---|
| Signature <br>|
| /s/Matthew D. Seath |
| Matthew D. Seath<br>|

---

------

<u>**Notary Acknowledgement**</u><br>

<u>****</u>

<br> State of<u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Washington &nbsp;&nbsp;&nbsp;&nbsp;</u> 

<u>****</u>

<br> County of<u>&nbsp;&nbsp;&nbsp;&nbsp; Grays Harbor&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ****</u>

I certify that I know or have satisfactory evidence that Matthew Seath [name of person] is the person who appeared before me and id person acknowledged that he/she signed this instrument and acknowledge it to be his/her free and voluntary act for the uses and purposes mentioned in this instrument.

---

| | |
|:---|:---|
| Date 12/11/2025 <br>|  |
| (Seal of Stamp) <br>|  |
| **HEIDI ROSE** <br>| <u>/s/Heidi Rose</u> <br>|
| **COMMISSION NO. 22022827** <br>| Signature <br>|
| **NOTARY PUBLIC** <br>|  |
| **EXPIRES: JUNE 27, 2026** <br>| <u>Business Development</u> <br>|
| **STATE OF WASHINGTON**  | Title  |
| My Appointment Expires: 6.27.2026  |  |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Seath Matthew Douglas<br><sub>(Last) (First) (Middle)</sub><br>624 SIMPSON AVENUE<br><sub>(Street)</sub><br>HOQUIAM, WA 98550<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>TIMBERLAND BANCORP INC [ TSBK ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-01-13 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_Chief Risk Officer/SVP_ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock, $0.01 par value per share | 3155 | D |  |
| Common Stock, $0.01 par value per share | 2155 | I | By KSOP<sup>(1)</sup> |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Stock options (right to buy)<sup>(2)</sup> | 2023-09-25 | 2028-09-25 | Common Stock, $0.01 par value per share | 800 | $31.8 | D |  |
| Stock options (right to buy)<sup>(3)</sup> | 2024-09-24 | 2029-09-24 | Common Stock, $0.01 par value per share | 800 | $27.14 | D |  |
| Stock options (right to buy)<sup>(4)</sup> | 2026-09-28 | 2031-09-28 | Common Stock, $0.01 par value per share | 1000 | $28.23 | D |  |
| Stock options (right to buy)<sup>(5)</sup> | 2027-09-27 | 2032-09-27 | Common Stock, $0.01 par value per share | 1000 | $27.4 | D |  |

---

### Footnotes:

(1) Represents shares held in the Timberland Bank Employee Stock Ownership and 401(k) Plan ("KSOP")

(2) Stock options granted 9/25/2018. These options vested at 20% per annum

(3) Stock options granted 9/24/2019. These options vested at 20% per annum

(4) Stock options granted 9/28/2021. These options will vest at 20% per annum

(5) Stock options granted 9/27/2022. These options will vest at 20% per annum

**Signature:** /s/Cheryl Parks, Power of Attorney for Matthew D. Seath  
**Date:** 2026-01-13

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**