Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

NORTHERN TECHNOLOGIES INTERNATIONAL CORP

NTIC · Nasdaq · CIK 0000875582 · Industrials · Specialty Chemicals

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

13 Form 4 transaction lines observed in the same window
3 sales · 10 option, withholding, award, gift or other lines

Last qualifying purchase2025-05-06 · von Falkenhausen Konstantin · $8.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesLow
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
NIGON RICHARDDirector
○▼○
LYNCH G PATRICKPresident and CEO
○▼▼
WOLSFELD MATTHEW CCFO and Corporate Secretary
○○
Ramdas GautamPresident and CEO
○
Lee SunggyuDirector
○
Kemp Sarah E.Director
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 2 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-05-06 · von Falkenhausen Konstantin.

Recent Form 4 activity

0Purchases
3Sales
14Other Form 4 lines
9SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING3 sale line(s) · context only
OTHER10 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
9,053
Previous report
8,318
Avg daily volume
5,998
Days to cover
1.5

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-05-06von Falkenhausen KonstantinPurchase (P)Common Stock1,100USD 7.23USD 7,953SEC filing ↗
2025-04-25Calderon Nancy E.Purchase (P)Common Stock1,000USD 7.45USD 7,450SEC filing ↗
2024-04-23Kemp Sarah E.Purchase (P)Common Stock1,275USD 15.70USD 20,018SEC filing ↗
2023-08-14Calderon Nancy E.Purchase (P)Common Stock500USD 13.17USD 6,585SEC filing ↗
2023-04-18Kemp Sarah E.Purchase (P)Common Stock2,473USD 12.13USD 30,002SEC filing ↗
2023-01-30Calderon Nancy E.Purchase (P)Common Stock500USD 12.92USD 6,460SEC filing ↗
2022-01-12Kemp Sarah E.Purchase (P)Common Stock2,012USD 14.91USD 30,002SEC filing ↗
2021-01-25Calderon Nancy E.Purchase (P)Common Stock1,000USD 14.78USD 14,780SEC filing ↗
2020-07-23Calderon Nancy E.Purchase (P)Common Stock1,000USD 8.60USD 8,600SEC filing ↗

Form 4 evidence

17 transaction lines in the latest 365-day window; 95 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-04Ramdas GautamAward / grant (A)Common Stock43,805USD 0.00USD 0SEC filing ↗
2026-09-01Pinho Cristina Lucia DuarteAward / grant (A)Common Stock6,188USD 0.00USD 0SEC filing ↗
2026-09-01NIGON RICHARDAward / grant (A)Common Stock7,426USD 0.00USD 0SEC filing ↗
Show recent Form 4 evidence (15 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-09-04Ramdas GautamAward / grant (A)Common Stock43,805USD 0.00USD 0SEC filing ↗
2026-09-01Pinho Cristina Lucia DuarteAward / grant (A)Common Stock6,188USD 0.00USD 0SEC filing ↗
2026-09-01NIGON RICHARDAward / grant (A)Common Stock7,426USD 0.00USD 0SEC filing ↗
2026-09-01Lee SunggyuAward / grant (A)Common Stock6,188USD 0.00USD 0SEC filing ↗
2026-09-01Kemp Sarah E.Award / grant (A)Common Stock6,188USD 0.00USD 0SEC filing ↗
2026-09-01Calderon Nancy E.Award / grant (A)Common Stock6,188USD 0.00USD 0SEC filing ↗
2026-07-30LYNCH G PATRICKSale (S)Common Stock16,070USD 8.00USD 128,560SEC filing ↗
2026-07-29LYNCH G PATRICKSale (S)Common Stock2USD 8.10USD 16SEC filing ↗
2026-07-29LYNCH G PATRICKOption exercise / conversion (M)Common Stock16,072USD 6.70USD 107,682SEC filing ↗
2026-07-20NIGON RICHARDSale (S)Common Stock12,000USD 8.00USD 96,000SEC filing ↗
2026-07-20NIGON RICHARDOption exercise / conversion (M)Common Stock12,000USD 6.70USD 80,400SEC filing ↗
2026-07-01WOLSFELD MATTHEW COption exercise / conversion (M)Common Stock11,879USD 6.70USD 79,589SEC filing ↗
2026-07-01WOLSFELD MATTHEW CTax withholding (F)Common Stock9,169USD 8.68USD 79,587SEC filing ↗
2026-02-11Calderon Nancy E.L (L)Common Stock5USD 8.66USD 42SEC filing ↗
2025-11-12Calderon Nancy E.L (L)Common Stock5USD 8.12USD 42SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerNTIC
CIK0000875582
SectorIndustrials
IndustrySpecialty Chemicals Yahoo Finance
SEC SIC3470 Coating, Engraving & Allied Services
ExchangeNasdaq

Data coverage

Local Form 4 history95 transaction lines from 2020-07-23 to 2026-09-04
10 P purchase lines · 4 S sale lines · 81 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.