Stock Options

A summary of stock option activities under the Northern Technologies International Corporation 2024 Stock Incentive Plan (2024 Plan), the Northern Technologies International Corporation Amended and Restated 2019 Stock Incentive Plan and the Northern Technologies International Corporation Amended and Restated 2007 Stock Incentive Plan is as follows:

The weighted average per share fair value of options granted during the nine months ended May 31, 2026 and 2025 was $3.05 and $4.95, respectively. The weighted average remaining contractual life of the options outstanding as of May 31, 2026 and 2025 was 5.48 years and 5.77 years, respectively.

The Company recognized stock option compensation expense of $257,671 and $767,922 and $304,510 and $907,330 during the three and nine months ended May 31, 2026 and 2025, respectively. As of May 31, 2026, there was $1,008,699 of unrecognized stock option compensation expense. The amount is expected to be recognized over a period of 2.25 years.

Restricted Stock Units

Restricted stock units (RSUs) were granted on September 1, 2025 under the 2024 Plan to certain non-employee directors and vest in full on the one-year anniversary of the date of grant. A summary of RSU activity for the nine months ended May 31, 2026 is as follows:

RSUs are valued using the closing stock price on the grant date. The Company recognizes the grant date fair value of the RSUs over the vesting term, or one year. The Company recognized RSU stock-based compensation expense of $52,789 and $157,052 and $37,366 and $110,880 during the nine months ended May 31, 2026 and 2025, respectively. As of May 31, 2026, there was $53,363 in unrecognized stock-based compensation expense relating to outstanding RSUs, which is expected to be recognized over a period of 0.25 years.