7 insiders reported 23 Form 4 transactions for NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC) over the past 18 months (most recent 2026-07-31). Recent activity: LYNCH G PATRICK (President and CEO) Buy 16,072 shares, LYNCH G PATRICK (President and CEO) Sell 2 shares, LYNCH G PATRICK (President and CEO) Sell 16,070 shares, NIGON RICHARD (Director) Buy 12,000 shares, NIGON RICHARD (Director) Sell 12,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-07-31 | LYNCH G PATRICK | President and CEO | Buy | 16,072 | $107,682 |
| 2026-07-31 | LYNCH G PATRICK | President and CEO | Sell | 2 | $16 |
| 2026-07-31 | LYNCH G PATRICK | President and CEO | Sell | 16,070 | $128,507 |
| 2026-07-21 | NIGON RICHARD | Director | Buy | 12,000 | $80,400 |
| 2026-07-21 | NIGON RICHARD | Director | Sell | 12,000 | $96,048 |
| 2026-07-02 | WOLSFELD MATTHEW C | CFO and Corporate Secretary | Buy | 11,879 | $79,589 |
| 2026-07-02 | WOLSFELD MATTHEW C | CFO and Corporate Secretary | Sell | 9,169 | $79,587 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 5 | $72 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 11 | $151 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 6 | $72 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 14 | $152 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 3 | $20 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 3 | $22 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 3 | $20 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 3 | $22 |
| 2025-09-03 | Calderon Nancy E. | Director | Buy | 6,739 | $0 |
| 2025-09-03 | Kemp Sarah E. | Director | Buy | 6,739 | $0 |
| 2025-09-03 | Pinho Cristina Lucia Duarte | Director | Buy | 6,739 | $0 |
| 2025-09-03 | NIGON RICHARD | Director | Buy | 8,086 | $0 |
| 2025-07-28 | NIGON RICHARD | Director | Buy | 12,000 | $89,160 |
| 2025-07-28 | NIGON RICHARD | Director | Sell | 10,873 | $89,159 |
| 2025-05-06 | von Falkenhausen Konstantin | Director | Buy | 1,100 | $7,953 |
| 2025-04-28 | Calderon Nancy E. | Director | Buy | 1,000 | $7,450 |
Source: SEC Form 4 filings · as of 2026-07-31