Northern Technologies (NTIC) Insider Exercise and Sale Filed on Form 4

Rhea-AI Filing Summary

Northern Technologies International Corp. (NTIC) reporting person Lee Sunggyu, a company director, filed a Form 4 disclosing insider transactions dated 09/01/2025. The filing shows a disposition of 3,319 shares of common stock and the acquisition by exercise of 16,287 stock options (exercise price shown as $7.42). After the transactions the filing reports beneficial ownership of 16,287 shares (direct). The form was signed by an attorney-in-fact on 09/03/2025.

Insights

Financial Analyst

TL;DR: Director exercised 16,287 options and sold 3,319 shares; transaction is routine insider activity, not a standalone valuation signal.

The filing documents an option exercise for 16,287 shares at a reported $7.42 exercise price and a contemporaneous disposition of 3,319 common shares. The reporting person is identified as a director and the Form 4 was filed individually. These are specific, routine Section 16 disclosures that update beneficial ownership; they do not include any commentary on proceeds, purpose of sale, or change in board role. Investors should treat this as a factual ownership update rather than evidence of broader company developments.

Corporate Governance Expert

TL;DR: Disclosure shows standard insider reporting of option exercise and share disposition by a director, consistent with SEC Section 16 requirements.

This Form 4 identifies the reporting person as a director and records an exercise of stock options creating 16,287 underlying shares and a sale/disposition of 3,319 common shares on 09/01/2025. The signature is by an attorney-in-fact. The filing provides no indication of any departure, change in responsibilities, or use of a 10b5-1 plan; it solely documents changes in beneficial ownership as required by law.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Lee Sunggyu

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Stock Option (right to buy)	16,287	$0.00	--
holding	Common Stock	--	--	--

Holdings After Transaction: Stock Option (right to buy) — 16,287 shares (Direct); Common Stock — 3,319 shares (Direct)

Footnotes (1)

Form 4 Insider Transactions: What Each Field Means →

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^*

Lee Sunggyu

(Last) (First) (Middle)

C/O NORTHERN TECHNOLOGIES INT'L CORP.

4201 WOODLAND ROAD, PO BOX 69

(Street)

CIRCLE PINES MN 55014

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
NORTHERN TECHNOLOGIES INTERNATIONAL CORP [ NTIC ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2025

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

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

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

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								3,319	D

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 Option (right to buy)	$7.42	09/01/2025		A		16,287		09/01/2026	08/31/2035	Common Stock	16,287	$0	16,287	D

Explanation of Responses:

	/s/ Matthew C. Wolsfeld-Attorney-in-fact	09/03/2025
	** 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.
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