NORTHERN TECHNOLOGIES INTERNATIONAL CORP — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| NIGON RICHARD | — | Award / Grant | 8,086 | — | — | 47,148 | Sep 1, 2025 |
| Kemp Sarah E. | — | Award / Grant | 6,739 | — | — | 16,270 | Sep 1, 2025 |
| Pinho Cristina Lucia Duarte | — | Award / Grant | 6,739 | — | — | 10,510 | Sep 1, 2025 |
| Calderon Nancy E. | — | L | 6 | $11.26 | $72 | 7,978 | Aug 13, 2025 |
| NIGON RICHARD | — | Tax Withholding | 10,873 | $8.20 | $89,159 | 39,062 | Jul 24, 2025 |
| von Falkenhausen Konstantin | — | Purchase | 1,100 | $7.23 | $7,953 | 18,219 | May 6, 2025 |
| Calderon Nancy E. | — | Purchase | 1,000 | $7.45 | $7,450 | 7,954 | Apr 25, 2025 |
| Pinho Cristina Lucia Duarte | — | Award / Grant | 3,771 | — | — | 3,771 | Sep 1, 2024 |
| Kemp Sarah E. | — | Award / Grant | 3,771 | — | — | 9,531 | Sep 1, 2024 |
| LYNCH G PATRICK | President and CEO | Option Exercise | 10,488 | $10.05 | $105,404 | 112,994 | Aug 26, 2024 |
| Calderon Nancy E. | — | L | 4 | $18.04 | $71 | 3,154 | Aug 14, 2024 |
| NIGON RICHARD | — | Tax Withholding | 7,665 | $13.11 | $100,488 | 37,935 | Aug 1, 2024 |
| von Falkenhausen Konstantin | — | Tax Withholding | 6,081 | $13.22 | $80,391 | 17,119 | Jul 31, 2024 |
| WOLSFELD MATTHEW C | CFO and Corporate Secretary | Option Exercise | 7,752 | $10.05 | $77,908 | 168,149 | Jul 15, 2024 |
| Kemp Sarah E. | — | Purchase | 1,275 | $15.70 | $20,018 | 5,760 | Apr 23, 2024 |
| von Falkenhausen Konstantin | — | Option Exercise | 8,000 | $7.35 | $58,800 | 15,200 | Aug 28, 2023 |
| Lee Sunggyu | — | Option Exercise | 8,000 | $7.35 | $58,800 | 8,000 | Aug 17, 2023 |
| Calderon Nancy E. | — | Purchase | 500 | $13.17 | $6,585 | 3,062 | Aug 14, 2023 |
| LYNCH G PATRICK | President and CEO | Option Exercise | 11,610 | $7.35 | $85,334 | 108,893 | Aug 8, 2023 |
| NIGON RICHARD | — | Tax Withholding | 7,153 | $12.33 | $88,196 | 35,447 | Jul 26, 2023 |
| WOLSFELD MATTHEW C | CFO and Corporate Secretary | Option Exercise | 8,582 | $7.35 | $63,078 | 160,338 | Jul 11, 2023 |
| Kemp Sarah E. | — | Purchase | 2,473 | $12.13 | $30,002 | 4,485 | Apr 18, 2023 |
| Calderon Nancy E. | — | Purchase | 500 | $12.92 | $6,460 | 2,562 | Jan 30, 2023 |
| Calderon Nancy E. | — | L | 14 | $13.17 | $181 | 3,087 | Nov 16, 2022 |
| von Falkenhausen Konstantin | — | Option Exercise | 6,000 | $5.13 | $30,780 | 7,200 | Oct 14, 2022 |
| LYNCH G PATRICK | President and CEO | Option Exercise | 36,824 | $5.13 | $188,907 | 110,928 | Oct 4, 2022 |
| WOLSFELD MATTHEW C | CFO and Corporate Secretary | Option Exercise | 27,218 | $5.13 | $139,628 | 161,813 | Oct 4, 2022 |
| Narayan Ramani | — | Option Exercise | 16,026 | $8.24 | $132,054 | 106,763 | Sep 29, 2022 |
| Narayan Ramani | — | Option Exercise | 8,000 | $7.43 | $59,440 | 63,000 | Apr 22, 2022 |
| Calderon Nancy E. | — | L | 14 | $10.02 | $143 | 2,049 | Feb 17, 2022 |
| Kemp Sarah E. | — | Purchase | 32 | $15.00 | $480 | 2,012 | Jan 12, 2022 |
| Narayan Ramani | — | Option Exercise | 8,000 | $7.35 | $58,800 | 47,000 | Nov 12, 2021 |
| Keong Koh Soo | — | Option Exercise | 11,737 | $10.80 | $126,760 | 85,069 | Jul 7, 2021 |
| Calderon Nancy E. | — | Purchase | 1,000 | $14.78 | $14,780 | 2,000 | Jan 25, 2021 |
| Calderon Nancy E. | — | Purchase | 1,000 | $8.60 | $8,600 | 1,000 | Jul 23, 2020 |
| NIGON RICHARD | — | Option Exercise | 1,500 | $10.25 | $15,375 | 15,300 | Sep 7, 2017 |
| Narayan Ramani | — | Option Exercise | 4,000 | $10.25 | $41,000 | 19,500 | Aug 31, 2017 |
| Keong Koh Soo | — | Option Exercise | 4,000 | $10.25 | $41,000 | 16,666 | Aug 23, 2017 |
| NIGON RICHARD | — | Option Exercise | 4,000 | $10.25 | $41,000 | 13,800 | Apr 27, 2017 |
| Narayan Ramani | — | Option Exercise | 4,000 | $9.76 | $39,040 | 15,500 | Aug 17, 2015 |
| NIGON RICHARD | — | Tax Withholding | 2,477 | $15.76 | $39,038 | 9,800 | Aug 17, 2015 |
| von Falkenhausen Konstantin | — | Purchase | 600 | $17.02 | $10,212 | 600 | Jul 24, 2015 |
| Keong Koh Soo | — | Option Exercise | 4,000 | $9.76 | $39,040 | 12,666 | Jul 3, 2015 |
| Colwell Barbara D. | — | Purchase | 100 | $17.06 | $1,706 | 1,300 | Apr 28, 2015 |
| NIGON RICHARD | — | Option Exercise | 2,333 | $10.20 | $23,797 | 9,333 | Jan 15, 2015 |
| Narayan Ramani | — | Option Exercise | 4,000 | $8.57 | $34,280 | 11,500 | Aug 26, 2014 |
| Keong Koh Soo | — | Option Exercise | 4,000 | $8.57 | $34,280 | 8,666 | Aug 25, 2014 |
| LYNCH G PATRICK | President and CEO | Sale | 12,000 | $21.25 | $255,000 | 37,052 | Apr 16, 2014 |
| WOLSFELD MATTHEW C | CFO and Corporate Secretary | Option Exercise | 9,000 | $7.65 | $68,850 | 66,966 | Mar 10, 2014 |
| CHENU PIERRE | — | Sale | 1,500 | $16.75 | $25,125 | 4,500 | Nov 26, 2013 |