Nasdaq · CIK 0000875582
NTIC NORTHERN TECHNOLOGIES INTERNATIONAL CORP
Insider trading from SEC Form 4. Last filing 35 d ago. Close $7.70 on Oct 12, 2026, +5% from the 52-week low and -22% from the high.
In brief
NORTHERN TECHNOLOGIES INTERNATIONAL CORP (NTIC) has 26 SEC Form 4 filings on file from 10 insiders, the latest filed on Sep 9, 2026. In the last 90 days insiders made 0 open-market buys worth $0 and 2 open-market sells worth $225k, net -$225k.
5 open-market trades have been scored at NTIC. The newest: G Patrick Lynch (President and CEO) sold $129k of stock on Jul 29, 2026, filed Jul 31, 2026, scored 34 (weak). 2 insiders sold within 14 days of each other around Jul 29, 2026.
2 Form 144 notices of planned sales are on file, the latest filed Jul 29, 2026.
Last 90 days
Price and insider trades, last year
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at NORTHERN TECHNOLOGIES INTERNATIONAL CORP, scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 34Weak | G Patrick Lynch President and CEO sell | $129k 16,072 shares | -13% | +10% from low-19% from high | |
| 23Weak | Richard Nigon director sell | $96k 12,000 shares | -20% | +10% from low-19% from high | |
| 26Weak | Konstantin von Falkenhausen director buy | $7,953 1,100 shares | +6% | - | |
| 26Weak | Nancy E. Calderon director buy | $7,452 1,000 shares | +14% | - | |
| 21Weak | Sarah E. Kemp director buy | $20k 1,275 shares | +28% | +62% from low0% from high |
Planned sales
Form 144 notices filed before a sale of restricted or control stock, newest first. The sale itself usually reaches a Form 4 within days. All planned sales
| Filed | Seller | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Jul 29, 2026 | LYNCH G PATRICK Officer, Director, 10% Stockholder | 16,072 0.17% of outstanding | $129k | Jul 29, 2026 | none |
| Jul 20, 2026 | NIGON RICHARD Director | 12,000 0.13% of outstanding | $96k | Jul 20, 2026 | none |
Transactions
Every row filed, 48 in all.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 4, 2026 | Gautam Ramdas President and CEO | AGrant or award Common Stock | +43,805 | $0.00 | $0 | 118,932 | 35 d ago |
| Sep 4, 2026 | Gautam Ramdas President and CEO | AGrant or award Stock Option (right to buy)derivative | +15,278 | $0.00 | $0 | 15,278 | 35 d ago |
| Sep 1, 2026 | G Patrick Lynch President and CEO | AGrant or award Stock Option (right to buy)derivative | +40,257 | $0.00 | $0 | 40,257 | 40 d ago |
| Sep 1, 2026 | Sarah E. Kemp director | AGrant or award Common Stock | +6,188 | $0.00 | $0 | 22,458 | 41 d ago |
| Sep 1, 2026 | Sunggyu Lee director | AGrant or award Common Stock | +6,188 | $0.00 | $0 | 9,507 | 41 d ago |
| Sep 1, 2026 | Richard Nigon director | AGrant or award Common Stock | +7,426 | $0.00 | $0 | 54,574 | 41 d ago |
| Nov 12, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $8.12 | $20 | 14,744 | 41 d ago |
| Sep 1, 2026 | Cristina Lucia Duarte Pinho director | AGrant or award Common Stock | +6,188 | $0.00 | $0 | 16,698 | 41 d ago |
| Nov 12, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $8.12 | $22 | 14,747 | 41 d ago |
| Sep 1, 2026 | Ramani Narayan director | AGrant or award Stock Option (right to buy)derivative | +15,044 | $0.00 | $0 | 15,044 | 41 d ago |
| Sep 1, 2026 | Konstantin von Falkenhausen director | AGrant or award Stock Option (right to buy)derivative | +15,044 | $0.00 | $0 | 15,044 | 41 d ago |
| Sep 1, 2026 | Matthew C Wolsfeld CFO and Corporate Secretary | AGrant or award Stock Option (right to buy)derivative | +29,755 | $0.00 | $0 | 29,755 | 41 d ago |
| Feb 11, 2026 | Nancy E. Calderon director | LSmall acquisition Common Stock | +2 | $8.66 | $20 | 14,749 | 41 d ago |
| Feb 11, 2026 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $8.66 | $22 | 14,752 | 41 d ago |
| Sep 1, 2026 | Nancy E. Calderon director | AGrant or award Common Stock | +6,188 | $0.00 | $0 | 20,940 | 41 d ago |
| Jul 29, 2026 | G Patrick Lynch President and CEO | MOption exercise Common Stock | +16,072 | $6.70 | $108k | 121,356 | Jul 31, 2026 |
| Jul 29, 2026 | G Patrick Lynch President and CEO | SOpen-market sale Common Stock | -2 | $8.10 | $16 | 121,354 | Jul 31, 2026 |
| Jul 30, 2026 | G Patrick Lynch President and CEO | SOpen-market sale Common Stock | -16,070 | $8.00 | $129k | 105,284 | Jul 31, 2026 |
| Jul 29, 2026 | G Patrick Lynch President and CEO | MOption exercise Stock Option (right to buy)derivative | -16,072 | $0.00 | $0 | 0 | Jul 31, 2026 |
| Jul 20, 2026 | Richard Nigon director | MOption exercise Common Stock | +12,000 | $6.70 | $80k | 59,148 | Jul 21, 2026 |
| Jul 20, 2026 | Richard Nigon director | SOpen-market sale Common Stock | -12,000 | $8.00 | $96k | 47,148 | Jul 21, 2026 |
| Jul 20, 2026 | Richard Nigon director | MOption exercise Stock Option (right to buy)derivative | -12,000 | $0.00 | $0 | 0 | Jul 21, 2026 |
| Jul 1, 2026 | Matthew C Wolsfeld CFO and Corporate Secretary | MOption exercise Common Stock | +11,879 | $6.70 | $80k | 180,135 | Jul 2, 2026 |
| Jul 1, 2026 | Matthew C Wolsfeld CFO and Corporate Secretary | FTax withholding Common Stock | -9,169 | $8.68 | $80k | 170,966 | Jul 2, 2026 |
| Jul 1, 2026 | Matthew C Wolsfeld CFO and Corporate Secretary | MOption exercise Stock Option (right to buy)derivative | -11,879 | $0.00 | $0 | 0 | Jul 2, 2026 |
| Sep 1, 2025 | Sarah E. Kemp director | AGrant or award Common Stock | +6,739 | $0.00 | $0 | 16,270 | Sep 3, 2025 |
| Nov 13, 2024 | Nancy E. Calderon director | LSmall acquisition Common Stock | +5 | $13.29 | $72 | 7,960 | Sep 3, 2025 |
| Sep 1, 2025 | Richard Nigon director | AGrant or award Common Stock | +8,086 | $0.00 | $0 | 47,148 | Sep 3, 2025 |
| Sep 1, 2025 | Cristina Lucia Duarte Pinho director | AGrant or award Common Stock | +6,739 | $0.00 | $0 | 10,510 | Sep 3, 2025 |
| Nov 13, 2024 | Nancy E. Calderon director | LSmall acquisition Common Stock | +11 | $13.29 | $151 | 7,971 | Sep 3, 2025 |
| Sep 1, 2025 | Sunggyu Lee director | AGrant or award Stock Option (right to buy)derivative | +16,287 | $0.00 | $0 | 16,287 | Sep 3, 2025 |
| Sep 1, 2025 | Konstantin von Falkenhausen director | AGrant or award Stock Option (right to buy)derivative | +16,287 | $0.00 | $0 | 16,287 | Sep 3, 2025 |
| Sep 1, 2025 | Ramani Narayan director | AGrant or award Stock Option (right to buy)derivative | +16,287 | $0.00 | $0 | 16,287 | Sep 3, 2025 |
| Sep 1, 2025 | Matthew C Wolsfeld CFO and Corporate Secretary | AGrant or award Stock Option (right to buy)derivative | +32,559 | $0.00 | $0 | 32,559 | Sep 3, 2025 |
| Feb 12, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +6 | $11.26 | $72 | 7,978 | Sep 3, 2025 |
| Sep 1, 2025 | G Patrick Lynch President and CEO | AGrant or award Stock Option (right to buy)derivative | +44,051 | $0.00 | $0 | 44,051 | Sep 3, 2025 |
| Feb 12, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +13 | $11.26 | $152 | 7,991 | Sep 3, 2025 |
| May 14, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $7.35 | $20 | 7,994 | Sep 3, 2025 |
| May 14, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $7.35 | $22 | 7,997 | Sep 3, 2025 |
| Aug 13, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $7.72 | $20 | 8,000 | Sep 3, 2025 |
| Aug 13, 2025 | Nancy E. Calderon director | LSmall acquisition Common Stock | +3 | $7.72 | $22 | 8,002 | Sep 3, 2025 |
| Sep 1, 2025 | Nancy E. Calderon director | AGrant or award Common Stock | +6,739 | $0.00 | $0 | 14,741 | Sep 3, 2025 |
| Jul 24, 2025 | Richard Nigon director | MOption exercise Common Stock | +12,000 | $7.43 | $89k | 49,935 | Jul 28, 2025 |
| Jul 24, 2025 | Richard Nigon director | FTax withholding Common Stock | -10,873 | $8.20 | $89k | 39,062 | Jul 28, 2025 |
| Jul 24, 2025 | Richard Nigon director | MOption exercise Stock Option (right to buy)derivative | -12,000 | $0.00 | $0 | 0 | Jul 28, 2025 |
| May 6, 2025 | Konstantin von Falkenhausen director | POpen-market purchase Common Stock | +1,100 | $7.23 | $7,953 | 18,219 | May 6, 2025 |
| Apr 25, 2025 | Nancy E. Calderon director | POpen-market purchase Common Stock | +1,000 | $7.45 | $7,452 | 7,954 | Apr 28, 2025 |
| Apr 23, 2024 | Sarah E. Kemp director | POpen-market purchase Common Stock | +1,275 | $15.70 | $20k | 5,760 | Apr 24, 2024 |
Insiders
Everyone who has filed a Form 4 here.
- Nancy E. Calderondirector
- Sarah E. Kempdirector
- G Patrick LynchPresident and CEO
- Sunggyu Leedirector
- Richard Nigondirector
- Ramani Narayandirector
- Cristina Lucia Duarte Pinhodirector
- Gautam RamdasPresident and CEO
- Matthew C WolsfeldCFO and Corporate Secretary
- Konstantin von Falkenhausendirector
Questions about NTIC
Answered from the filings on this page, as of the latest one.
Are insiders buying NTIC?
As of Sep 9, 2026, SEC Form 4 filings show 0 open-market buys worth $0 by 0 insiders and 2 open-market sells worth $225k by 2 insiders at NORTHERN TECHNOLOGIES INTERNATIONAL CORP in the last 90 days, net -$225k. Only purchases (code P) and sales (code S) count; grants, option exercises and tax withholding do not.
Who was the last insider to trade NTIC on the open market?
G Patrick Lynch (President and CEO) sold $129k of NTIC on Jul 29, 2026 and filed the Form 4 on Jul 31, 2026. InsiderTell scored 34 (weak), with 2 insiders on the same side within 14 days.
How many insiders file Form 4 at NORTHERN TECHNOLOGIES INTERNATIONAL CORP?
10 people have filed a Form 4 at NORTHERN TECHNOLOGIES INTERNATIONAL CORP, among them Nancy E. Calderon (director), Sarah E. Kemp (director), G Patrick Lynch (President and CEO). Officers, directors and holders of more than 10% of a share class must report their trades within two business days.
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.