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

Great Lakes Dredge & Dock CORP

GLDD · — · CIK 0001372020 · Industrials

INSIDER SIGNAL

No active buy signal

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

0 Form 4 transaction lines observed in the same window
0 sales · 0 option, withholding, award, gift or other lines

Last qualifying purchase2025-03-04 · GUNSTEN CHRISTOPHER · $30.0K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesNone
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

No Form 4 transaction event is present in the current 180-day window.

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: 2025-03-04 · GUNSTEN CHRISTOPHER.

Recent Form 4 activity

0Purchases
2Sales
79Other Form 4 lines
35SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING0 sale line(s) · context only
OTHER0 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

The FINRA report lists no short interest for this ticker.

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
2025-03-04GUNSTEN CHRISTOPHERPurchase (P)Common Stock3,875USD 7.75USD 30,031SEC filing ↗
2023-05-19Levenson RyanPurchase (P)Common Stock121,721USD 6.82USD 830,137SEC filing ↗
2023-05-18Levenson RyanPurchase (P)Common Stock6,860USD 6.75USD 46,305SEC filing ↗
2023-05-17Levenson RyanPurchase (P)Common Stock5,207USD 6.64USD 34,574SEC filing ↗
2023-05-12Levenson RyanPurchase (P)Common Stock68,000USD 6.10USD 414,800SEC filing ↗
2023-05-11Levenson RyanPurchase (P)Common Stock66,000USD 6.13USD 404,580SEC filing ↗
2023-05-10Levenson RyanPurchase (P)Common Stock66,000USD 6.05USD 399,300SEC filing ↗
2023-03-02Shipp Earl LPurchase (P)Common Stock2,000USD 5.51USD 11,020SEC filing ↗
2022-08-05Petterson LassePurchase (P)Common Stock10,000USD 9.65USD 96,500SEC filing ↗
2021-08-06Shipp Earl LPurchase (P)Common Stock1,500USD 14.58USD 21,870SEC filing ↗

Form 4 evidence

81 transaction lines in the latest 365-day window; 547 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-04-01Steger RonaldU (U)Common Stock20,404USD —USD —SEC filing ↗
2026-04-01Shipp Earl LU (U)Common Stock42,619USD —USD —SEC filing ↗
2026-04-01Shanahan Kathleen MU (U)Common Stock76,375USD —USD —SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-04-01Steger RonaldU (U)Common Stock20,404USD —USD —SEC filing ↗
2026-04-01Shipp Earl LU (U)Common Stock42,619USD —USD —SEC filing ↗
2026-04-01Shanahan Kathleen MU (U)Common Stock76,375USD —USD —SEC filing ↗
2026-04-01Schiffer VivienneU (U)Common Stock144,817USD —USD —SEC filing ↗
2026-04-01Schiffer VivienneAward / grant (A)Common Stock28,945USD —USD —SEC filing ↗
2026-04-01Petterson LasseU (U)Common Stock1,568,290USD —USD —SEC filing ↗
2026-04-01Petterson LasseAward / grant (A)Common Stock206,445USD —USD —SEC filing ↗
2026-04-01Kornblau Scott LeeU (U)Common Stock244,126USD —USD —SEC filing ↗
2026-04-01Kornblau Scott LeeAward / grant (A)Common Stock90,518USD —USD —SEC filing ↗
2026-04-01JOHANSON DAVIDU (U)Common Stock191,598USD —USD —SEC filing ↗
2026-04-01JOHANSON DAVIDAward / grant (A)Common Stock71,860USD —USD —SEC filing ↗
2026-04-01HANSON WILLIAM HU (U)Common Stock90,853USD —USD —SEC filing ↗
2026-04-01HANSON WILLIAM HAward / grant (A)Common Stock13,631USD —USD —SEC filing ↗
2026-04-01GUNSTEN CHRISTOPHERU (U)Common Stock182,496USD —USD —SEC filing ↗
2026-04-01GUNSTEN CHRISTOPHERAward / grant (A)Common Stock71,860USD —USD —SEC filing ↗
2026-04-01DICKERSON LAWRENCE RU (U)Common Stock86,217USD —USD —SEC filing ↗
2026-04-01BEYKO ELENIU (U)Common Stock151,312USD —USD —SEC filing ↗
2026-04-01BEYKO ELENIAward / grant (A)Common Stock25,505USD —USD —SEC filing ↗
2026-04-01BAYER RYANU (U)Common Stock37,380USD —USD —SEC filing ↗
2026-04-01BAYER RYANAward / grant (A)Common Stock5,607USD —USD —SEC filing ↗
2026-04-01Armstrong Dana AU (U)Common Stock8,436USD —USD —SEC filing ↗
2026-03-16Schiffer VivienneTax withholding (F)Common Stock10,125USD 16.93USD 171,416SEC filing ↗
2026-03-16Schiffer VivienneAward / grant (A)Common Stock24,667USD —USD —SEC filing ↗
2026-03-16Petterson LasseTax withholding (F)Common Stock103,821USD 16.93USD 1,757,690SEC filing ↗
2026-03-16Petterson LasseAward / grant (A)Common Stock173,464USD —USD —SEC filing ↗
2026-03-16Kornblau Scott LeeTax withholding (F)Common Stock22,258USD 16.93USD 376,828SEC filing ↗
2026-03-16Kornblau Scott LeeAward / grant (A)Common Stock37,133USD —USD —SEC filing ↗
2026-03-16JOHANSON DAVIDTax withholding (F)Common Stock7,825USD 16.93USD 132,477SEC filing ↗
2026-03-16JOHANSON DAVIDAward / grant (A)Common Stock21,090USD —USD —SEC filing ↗
2026-03-16HANSON WILLIAM HTax withholding (F)Common Stock4,859USD 16.93USD 82,263SEC 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 · —
TickerGLDD
CIK0001372020
SectorIndustrials
Industry— Yahoo Finance
SEC SIC1600 Heavy Construction Other Than Bldg Const - Contractors
Exchange—

Data coverage

Local Form 4 history547 transaction lines from 2020-03-08 to 2026-04-01
10 P purchase lines · 70 S sale lines · 467 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.