Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-19 · Built: 2026-10-19 · 中文

← United States · Coverage record

US · SEC FORM 4

PHOTRONICS INC

PLAB · Nasdaq · CIK 0000810136 · Technology · Semiconductor Equipment & Materials

INSIDER SIGNAL

No active buy signal

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

6 Form 4 transaction lines observed in the same window
4 sales · 2 option, withholding, award, gift or other lines

Last qualifying purchase2025-06-27 · Garcia David A. · $50.4K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesModerate
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.

Purchase breadth, concentration & cluster buying

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

Insider activity timeline

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

AprMayJunJulAugSepOct
Lee Kang JyhDirector
▼▼▼
Park Han KyungSVP & GM of FPD Ops
▼
ZHANG RUIVP, CAO & Corporate Controller
○
Rivera EricPresident, CFO
○
● Purchase▼ Sale○ Other

—

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: 2025-06-27 · Garcia David A..

Recent Form 4 activity

0Purchases
50Sales
37Other Form 4 lines
64SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING4 sale line(s) · context only
OTHER2 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
4,113,903
Previous report
4,334,857
Avg daily volume
805,083
Days to cover
5.1

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
2025-06-27Garcia David A.Purchase (P)COMMON STOCK2,650USD 19.00USD 50,350SEC filing ↗

Form 4 evidence

87 transaction lines in the latest 365-day window; 480 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01ZHANG RUITax withholding (F)COMMON STOCK392USD 30.83USD 12,085SEC filing ↗
2026-10-01Rivera EricTax withholding (F)COMMON STOCK2,897USD 30.83USD 89,315SEC filing ↗
2026-09-29Lee Kang JyhSale (S)COMMON STOCK10,000USD 30.75USD 307,500SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-10-01ZHANG RUITax withholding (F)COMMON STOCK392USD 30.83USD 12,085SEC filing ↗
2026-10-01Rivera EricTax withholding (F)COMMON STOCK2,897USD 30.83USD 89,315SEC filing ↗
2026-09-29Lee Kang JyhSale (S)COMMON STOCK10,000USD 30.75USD 307,500SEC filing ↗
2026-09-25Park Han KyungSale (S)COMMON STOCK9,500USD 30.37USD 288,515SEC filing ↗
2026-09-24Lee Kang JyhSale (S)COMMON STOCK7,500USD 29.50USD 221,250SEC filing ↗
2026-09-22Lee Kang JyhSale (S)COMMON STOCK10,000USD 29.70USD 297,000SEC filing ↗
2026-04-17ZHANG RUISale (S)COMMON STOCK4,556USD 46.70USD 212,765SEC filing ↗
2026-04-17Paladino MaryD (D)COMMON STOCK22,548USD 47.77USD 1,077,118SEC filing ↗
2026-04-16Lee Kang JyhSale (S)COMMON STOCK20,000USD 45.92USD 918,500SEC filing ↗
2026-04-15Lee Kang JyhSale (S)COMMON STOCK10,000USD 45.10USD 451,000SEC filing ↗
2026-04-14Wang Hsueh-ChunSale (S)COMMON STOCK19,250USD 45.30USD 872,025SEC filing ↗
2026-04-14MACRICOSTAS CONSTANTINE SSale (S)COMMON STOCK50,000USD 45.35USD 2,267,500SEC filing ↗
2026-04-13TYSON MITCHELL GAward / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-13Rivera EricSale (S)COMMON STOCK1,000USD 44.77USD 44,770SEC filing ↗
2026-04-13Rivera EricOption exercise / conversion (M)COMMON STOCK1,000USD 9.78USD 9,780SEC filing ↗
2026-04-13MACRICOSTAS CONSTANTINE SAward / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-13Liao Daniel JLAward / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-13Lee Kang JyhSale (S)COMMON STOCK5,000USD 45.00USD 225,000SEC filing ↗
2026-04-13Lee Kang JyhOption exercise / conversion (M)COMMON STOCK5,000USD 8.60USD 43,000SEC filing ↗
2026-04-13LEWIS ADAM MAward / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-13Garcia David A.Award / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-13Almeida MichelleAward / grant (A)COMMON STOCK3,722USD 0.00USD 0SEC filing ↗
2026-04-09Wang Hsueh-ChunSale (S)COMMON STOCK11,875USD 44.25USD 525,469SEC filing ↗
2026-04-09Rivera EricSale (S)COMMON STOCK41,517USD 44.00USD 1,826,748SEC filing ↗
2026-04-09Lee Kang JyhSale (S)COMMON STOCK5,000USD 44.00USD 220,000SEC filing ↗
2026-04-09Lee Kang JyhOption exercise / conversion (M)COMMON STOCK5,000USD 8.60USD 43,000SEC filing ↗
2026-04-08ZHANG RUISale (S)COMMON STOCK1,752USD 43.50USD 76,212SEC filing ↗
2026-04-08Wang Hsueh-ChunSale (S)COMMON STOCK10,000USD 42.69USD 426,900SEC filing ↗
2026-04-08MACRICOSTAS GEORGESale (S)COMMON STOCK121,194USD 42.94USD 5,203,718SEC filing ↗
2026-04-08Lee Kang JyhSale (S)COMMON STOCK5,000USD 43.27USD 216,350SEC 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 date2026-10-19
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerPLAB
CIK0000810136
SectorTechnology
IndustrySemiconductor Equipment & Materials Yahoo Finance
SEC SIC3674 Semiconductors & Related Devices
ExchangeNasdaq

Data coverage

Local Form 4 history480 transaction lines from 2020-01-02 to 2026-10-01
1 P purchase lines · 201 S sale lines · 278 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-19. Mapping status is an audit field and does not erase SEC filing evidence.