X0609 4 2026-09-28 0 0001046050 TIMBERLAND BANCORP INC TSBK 0002104858 Seath Matthew Douglas false 624 SIMPSON AVENUE HOQUIAM WA 98550 0 1 0 0 Chief Risk Officer/EVP 0 Common Stock, $.01 par value 2026-09-28 4 F 0 42 45.41 D 2978 D Common Stock, $.01 par value 2026-09-29 4 A 0 1250 0 A 4228 D Common Stock, $.01 par value 2155 I By KSOP As previously reported 140 shares of restricted stock vested on September 26, 2026, of which 42 shares were withheld at the election of the Reporting Person for Issuer to pay the value of the vested shares to state and federal tax authorities for the Reporting Person's account. Restricted Stock Award was granted on 9/29/2026. These shares will vest equally over 5 years. Represents shares held in the Timberland Bank Employee Stock Ownership and 401(k) Plan ("KSOP"). /s/Cheryl Parks, Power of Attorney for Matthew D. Seath 2026-09-30