Timberland Bancorp officer exercises, sells 3,000 shares

Timberland Bancorp Inc Chief Risk Officer/EVP Matthew Douglas Seath reported option-related trades on July 31, 2026.

Rhea-AI Filing Summary

Timberland Bancorp Inc Chief Risk Officer/EVP Matthew Douglas Seath reported option-related trades on July 31, 2026. He exercised stock options covering a total of 3,000 shares of common stock at exercise prices between 27.14 and 31.80 per share and, on the same date, sold 3,000 common shares at 44.75 per share. He also reports indirect ownership of 2,155 shares held through the Timberland Bank Employee Stock Ownership and 401(k) Plan (KSOP). The transactions were not indicated as being made under a Rule 10b5-1 trading plan.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 10 txns

Insider Seath Matthew Douglas

Role Chief Risk Officer/EVP

Sold 3,000 shs ($134K)

Approx. gross sale proceeds $134K

Approx. exercise cost $86K

Type	Security	Shares	Price	Value
Exercise	Stock Options (Right to Buy)	800	$0.00	$0.00
Exercise	Stock Options (Right to Buy)	800	$0.00	$0.00
Exercise	Stock Options (Right to Buy) F2	800	$0.00	$0.00
Exercise	Stock Options (Right to Buy) F2	600	$0.00	$0.00
Exercise	Common Stock, $.01 par value per share	800	$31.80	$25K
Exercise	Common Stock, $.01 par value per share	800	$27.14	$22K
Exercise	Common Stock, $.01 par value per share	800	$28.23	$23K
Exercise	Common Stock, $.01 par value per share	600	$27.40	$16K
Sale	Common Stock, $.01 par value per share	3,000	$44.75	$134K
holding	Common Stock, $.01 par value per share F1	--	--	--

Holdings After Transaction: Stock Options (Right to Buy) — 6,600 contracts (Direct); Common Stock, $.01 par value per share — 3,155 shares (Direct); Common Stock, $.01 par value per share — 2,155 shares (Indirect, By KSOP)

Footnotes (2)

1. F1. Represents shares held in the Timberland Bank Employee Stock Ownership and 401(k) Plan ("KSOP")
2. F2. Represents date options will be fully vested

Key Figures

Options exercised (underlying shares): 3,000 shares Common shares sold: 3,000 shares Option exercise price 1: 31.8000 per share +4 more

7 metrics

Options exercised (underlying shares) 3,000 shares Total underlying common shares from option exercises on 2026-07-31

Common shares sold 3,000 shares Common stock sold at 44.7500 per share on 2026-07-31

Option exercise price 1 31.8000 per share Exercise price for 800 stock options expiring 2028-09-25

Option exercise price 2 27.1400 per share Exercise price for 800 stock options expiring 2029-09-24

Option exercise price 3 28.2300 per share Exercise price for 800 stock options expiring 2031-09-28

Option exercise price 4 27.4000 per share Exercise price for 600 stock options expiring 2032-09-27

Indirect holdings via KSOP 2,155.0000 shares Common shares held in the Timberland Bank Employee Stock Ownership and 401(k) Plan

Key Terms

Stock Options (Right to Buy), Employee Stock Ownership and 401(k) Plan ("KSOP"), par value per share, open market or private transaction

4 terms

Stock Options (Right to Buy) financial

"security_title shows "Stock Options (Right to Buy)" for derivative entries"

Employee Stock Ownership and 401(k) Plan ("KSOP") financial

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

par value per share financial

"Common Stock, $.01 par value per share"

open market or private transaction financial

"transaction_code_description: Sale in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transactions did Timberland Bancorp (TSBK) officer Matthew Douglas Seath report?

Matthew Douglas Seath reported exercising stock options for 3,000 shares of Timberland Bancorp common stock and, on the same July 31, 2026 date, selling 3,000 common shares at 44.75 per share, according to the Form 4 insider filing data.

How many Timberland Bancorp (TSBK) shares did Seath sell and at what price?

Seath sold 3,000 shares of Timberland Bancorp common stock at a price of 44.75 per share on July 31, 2026. This sale followed option exercises for the same total number of underlying common shares on that date.

What stock options did Seath exercise in Timberland Bancorp (TSBK)?

Seath exercised stock options labeled "Stock Options (Right to Buy)" for 3,000 underlying common shares: 800 at 31.8000, 800 at 27.1400, 800 at 28.2300, and 600 at 27.4000 per share, all reported with a transaction date of July 31, 2026.

Does Seath still hold Timberland Bancorp (TSBK) shares after these transactions?

Yes. After the reported transactions, Seath shows 2,155.0000 shares of Timberland Bancorp common stock held indirectly "By KSOP" in the Timberland Bank Employee Stock Ownership and 401(k) Plan, according to the holding entry in the Form 4 data.

Were Seath’s Timberland Bancorp (TSBK) transactions under a Rule 10b5-1 plan?

The filing’s 10b5-1 checkbox is not marked as affirmative (aff_10b5_one is false), indicating these reported option exercises and the 3,000-share sale were not designated as executed under a Rule 10b5-1 trading plan in the disclosure.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 08/03/2026 - 03:21 PM Accepted by SEC EDGAR 08/03/2026 - 03:21 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Seath Matthew Douglas

(Last) (First) (Middle)

624 SIMPSON AVENUE

(Street)

HOQUIAM WASHINGTON 98550

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
TIMBERLAND BANCORP INC [ TSBK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Risk Officer/EVP

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
07/31/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $.01 par value per share	07/31/2026		M		800	A	$31.8	3,955	D
Common Stock, $.01 par value per share	07/31/2026		M		800	A	$27.14	4,755	D
Common Stock, $.01 par value per share	07/31/2026		M		800	A	$28.23	5,555	D
Common Stock, $.01 par value per share	07/31/2026		M		600	A	$27.4	6,155	D
Common Stock, $.01 par value per share	07/31/2026		S		3,000	D	$44.75	3,155	D
Common Stock, $.01 par value per share								2,155	I	By KSOP(1)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Options (Right to Buy)	$31.8	07/31/2026		M			800	09/25/2023	09/25/2028	Common Stock	800	$0	2,800	D
Stock Options (Right to Buy)	$27.14	07/31/2026		M			800	09/24/2024	09/24/2029	Common Stock	800	$0	2,000	D
Stock Options (Right to Buy)	$28.23	07/31/2026		M			800	09/28/2026(2)	09/28/2031	Common Stock	800	$0	1,200	D
Stock Options (Right to Buy)	$27.4	07/31/2026		M			600	09/27/2027(2)	09/27/2032	Common Stock	600	$0	600	D

Explanation of Responses:

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

2. Represents date options will be fully vested

	/s/Cheryl Parks, Power of Attorney for Matthew Douglas Seath	08/03/2026
	** Signature of Reporting Person	Date
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.
* Form 4: SEC 1474 (03-26)