NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC)
Data as of , from SEC Form 4 filings.
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About NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC)
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.
- CIRCLE PINES, MN
- 94
- 1992
- XNAS
NTIC Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 3 | 28,072 | $225K |
| Grant or award | 11 | 191,361 | |
| Option exercise | 4 | 56,144 | |
NTIC insider transactions (Form 4)
4523 Form 4 filings on record, the earliest from Jul 24, 2025, newest first.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Gautam Ramdas - Officer | Grant or award | Common Stock | 43,805 | $0.00 footnote F1 | - | |
| Gautam Ramdas - Officer | Grant or award | Stock Option (right to buy) | 15,278 | $0.00 | - | |
| ||||||
| G. Patrick Lynch - Officer | Grant or award | Stock Option (right to buy) | 40,257 | $0.00 | - | |
| Matthew C. Wolsfeld - Officer | Grant or award | Stock Option (right to buy) | 29,755 | $0.00 | - | |
| Richard Nigon - Director | Grant or award | Common Stock | 7,426 footnote F1 | $0.00 | - | |
| ||||||
| Sunggyu Lee - Director | Grant or award | Common Stock | 6,188 footnote F1 | $0.00 | - | |
| ||||||
| Sarah E. Kemp - Director | Grant or award | Common Stock | 6,188 footnote F1 | $0.00 | - | |
| ||||||
| Cristina Lucia Duarte Pinho - Director | Grant or award | Common Stock | 6,188 footnote F1 | $0.00 | - | |
| ||||||
| Falkenhausen Konstantin von - Director | Grant or award | Stock Option (right to buy) | 15,044 | $0.00 | - | |
| Ramani Narayan - Director | Grant or award | Stock Option (right to buy) | 15,044 | $0.00 | - | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.37 | $8.66 | $20 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.53 | $8.66 | $22 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.52 | $8.12 | $20 | |
| Nancy E. Calderon - Director | Other | Common Stock | 2.7 | $8.12 | $22 | |
| Nancy E. Calderon - Director | Grant or award | Common Stock | 6,188 footnote F1 | $0.00 | - | |
| ||||||
| 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 footnote F1 | $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 footnote F1 | $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 | |
| Cristina Lucia Duarte Pinho - 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 | - | |
| Sarah E. Kemp - Director | Grant or award | Common Stock | 6,739 | $0.00 | - | |
| Falkenhausen Konstantin von - 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 | - | |
| Sunggyu Lee - Director | Grant or award | Stock Option (right to buy) | 16,287 | $0.00 | - | |
| Matthew C. Wolsfeld - Officer | Grant or award | Stock Option (right to buy) | 32,559 | $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 | - | |
Item 5.02
Item 5.02, 7.01, 9.01
Item 2.02, 9.01
Item 8.01
Recent NTIC Form 144 notices of proposed sale
2An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| - | - | - | - | View on EDGAR | |
| - | - | - | - |
NTIC insider trading FAQ
What is the latest insider trade for NTIC?
NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC) had 12 insider filings in the last 90 days, with the most recent on 2026-09-10. The full record for NTIC runs to 23 Form 4 filings, the earliest from 2025-07-24. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying NTIC stock?
No insider purchases of NTIC were filed in the last 90 days.
How many insiders are selling NTIC stock?
3 insider sales of NTIC were filed in the last 90 days, totaling $225K.
Where can I see NTIC SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects NTIC Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Materials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Gautam Ramdas view on EDGAR
- - G. Patrick Lynch view on EDGAR
- - Matthew C. Wolsfeld view on EDGAR
- - Richard Nigon view on EDGAR
- - Sunggyu Lee view on EDGAR
- - Sarah E. Kemp view on EDGAR
- - Cristina Lucia Duarte Pinho view on EDGAR
- - Falkenhausen Konstantin von view on EDGAR
- - Ramani Narayan view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Materials
- Where NTIC's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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