NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC)
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Northern Technologies International Corp is a United States-based firm that develops and markets proprietary, environmentally beneficial products and services world wide either directly or through a network of joint ventures, distributors, and agents. It operates through two segments, which include ZERUST products and services and Nature-Tec products. Its main business is providing corrosion prevention solutions that are marketed under the ZERUST brand. The company also sells a portfolio of bio-based and biodegradable (compostable) polymer resin compounds and finished products marketed under the Nature-Tec brand. The ZERUST brand generates a vast majority of the revenue for the company. The company generates the majority of its revenue in the United States.
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 3 | 28,072 | $225K |
| Option exercise | 6 | 79,902 | |
| Tax withholding / forfeiture | 1 | 9,169 |
Dollar totals are shown for open-market purchases and sales only. Grants, option exercises, gifts and tax withholding are reported by share count because they are not trades at a market price.
13 Form 4 filings on record, the earliest from Jul 24, 2025, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| G. Patrick Lynch - Officer | Option exercise | Common Stock | 16,072 | $6.70 | $108K | |
| G. Patrick Lynch - Officer | Open-market sale | Common Stock | 2 | $8.10 | $16 | |
| G. Patrick Lynch - Officer | Open-market sale | Common Stock | 16,070 | $8.00 | $129K | |
| G. Patrick Lynch - Officer | Option exercise | Stock Option (right to buy) | 16,072 | $0.00 | - | |
| Richard Nigon - Director | Option exercise | Common Stock | 12,000 | $6.70 | $80K | |
| Richard Nigon - Director | Open-market sale | Common Stock | 12,000 | $8.00 | $96K | |
| Richard Nigon - Director | Option exercise | Stock Option (right to buy) | 12,000 | $0.00 | - | |
| Matthew C. Wolsfeld - Officer | Option exercise | Stock Option (right to buy) | 11,879 | $0.00 | - | |
| Matthew C. Wolsfeld - Officer | Option exercise | Common Stock | 11,879 | $6.70 | $80K | |
| Matthew C. Wolsfeld - Officer | Tax withholding / forfeiture | Common Stock | 9,169 | $8.68 | $80K | |
| Matthew C. Wolsfeld - Officer | Grant or award | Stock Option (right to buy) | 32,559 | $0.00 | - | |
| Sunggyu Lee - Director | Grant or award | Stock Option (right to buy) | 16,287 | $0.00 | - | |
| Ramani Narayan - Director | Grant or award | Stock Option (right to buy) | 16,287 | $0.00 | - | |
| Falkenhausen Konstantin von - Director | Grant or award | Stock Option (right to buy) | 16,287 | $0.00 | - | |
| Cristina Lucia Duarte Pinho - Director | Grant or award | Common Stock | 6,739 | $0.00 | - | |
| Sarah E. Kemp - Director | Grant or award | Common Stock | 6,739 | $0.00 | - | |
| Nancy E. Calderon - Director | Other | Common Stock | 5.42 | $13.29 | $72 | |
| Nancy E. Calderon - Director | Other | Common Stock | 11.38 | $13.29 | $151 | |
| Nancy E. Calderon - Director | Other | Common Stock | 6.43 | $11.26 | $72 | |
| Nancy E. Calderon - Director | Other | Common Stock | 13.5 | $11.26 | $152 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.78 | $7.35 | $20 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.97 | $7.35 | $22 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.65 | $7.72 | $20 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.83 | $7.72 | $22 | |
| Nancy E. Calderon - Director | Grant or award | Common Stock | 6,739 | $0.00 | - | |
| G. Patrick Lynch - Officer | Grant or award | Stock Option (right to buy) | 44,051 | $0.00 | - | |
| Richard Nigon - Director | Grant or award | Common Stock | 8,086 | $0.00 | - | |
| Richard Nigon - Director | Option exercise | Common Stock | 12,000 | $7.43 | $89K | |
| Richard Nigon - Director | Tax withholding / forfeiture | Common Stock | 10,873 | $8.20 | $89K | |
| Richard Nigon - Director | Option exercise | Stock Option (right to buy) | 12,000 | $0.00 | - |
A Form 144 is notice of an INTENDED sale, not a completed one. It often precedes the Form 4 that reports the trade actually happening.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| - | - | - | - | View on EDGAR | |
| - | - | - | - | View on EDGAR |
NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC) had 3 insider filings in the last 90 days, with the most recent on 2026-07-31. The full record for NTIC runs to 13 Form 4 filings, the earliest from 2025-07-24. InsiderAlpha tracks every Form 4, Form 144, and 8-K filing in real time.
No insider purchases of NTIC were filed in the last 90 days.
3 insider sales of NTIC were filed in the last 90 days, totaling $225K.
This page tracks NTIC Form 4 insider transactions, Form 144 sale notices, and 8-K material event disclosures in one timeline. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
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Every Form 4 below links to the original document on SEC EDGAR, so the numbers on this page can be checked against the filing they came from.
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