X0609 4 2026-07-29 0 0000875582 NORTHERN TECHNOLOGIES INTERNATIONAL CORP NTIC 0001258554 LYNCH G PATRICK false C/O NORTHERN TECHNOLOGIES INT'L CORP. 4201 WOODLAND ROAD, PO BOX 69 CIRCLE PINES MN 55014 1 1 1 0 President and CEO 0 Common Stock 2026-07-29 4 M 0 16072 6.7 A 121356 D Common Stock 2026-07-29 4 S 0 2 8.1 D 121354 D Common Stock 2026-07-30 4 S 0 16070 7.9967 D 105284 D Common Stock 1203334 I (2) Stock Option (right to buy) 6.7 2026-07-29 4 M 0 16072 0 D 2026-08-31 Common Stock 16072 0 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.95 to $8.05, inclusive. The reporting person undertakes to provide to Northern Technologies International Corporation (NTIC), any security holder of NTIC, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4. These shares are held directly by Inter Alia Holding Company of which G. Patrick Lynch is an officer and stockholder. Mr. G. Patrick Lynch disclaims beneficial ownership of the shares held by Inter Alia Holding Company, except to the extent of his pecuniary interest therein. This option has fully vested. /s/ Matthew C. Wolsfeld-Attorney-in-fact 2026-07-31