Great Lakes Dredge Dock CORP (GLDD) Insider Trading & SEC Filings

Updated Jul 16, 2026 · Last SEC filing 2026-04-01

Great Lakes Dredge Dock CORP (GLDD) — no SEC Form 4 insider filings recorded in the last 90 days. InsiderAlpha tracks every GLDD SEC filing — Form 4, Form 144, and 8-K — in real time, including Rule 10b5-1 plan detection.

About Great Lakes Dredge Dock CORP (GLDD)

SIC classification	Heavy Construction Other Than Bldg Const - Contractors (SIC 1600)
SEC CIK	0001372020

Recent GLDD Insider Transactions (Form 4)

Date	Insider	Role	Transaction	Shares	Price	Value	Filing
2026-04-01	Petterson Lasse	CEO & President	A — Grant or award	206.4K	—	—	SEC
2026-04-01	HANSON WILLIAM H	SVP, Market Development	J — Other acquisition / disposition	90.9K	—	—	SEC
2026-04-01	DICKERSON LAWRENCE R	Insider	J — Other acquisition / disposition	86.2K	—	—	SEC
2026-04-01	Schiffer Vivienne	SVP, CLO, CCO & Corp Secretary	J — Other acquisition / disposition	144.8K	—	—	SEC
2026-04-01	Kornblau Scott Lee	SVP & CFO	J — Other acquisition / disposition	244.1K	—	—	SEC
2026-04-01	HANSON WILLIAM H	SVP, Market Development	A — Grant or award	13.6K	—	—	SEC
2026-04-01	Shipp Earl L	Insider	J — Other acquisition / disposition	42.6K	—	—	SEC
2026-04-01	Shanahan Kathleen M	Insider	J — Other acquisition / disposition	76.4K	—	—	SEC
2026-04-01	Armstrong Dana A	Insider	J — Other acquisition / disposition	8.4K	—	—	SEC
2026-04-01	Schiffer Vivienne	SVP, CLO, CCO & Corp Secretary	A — Grant or award	28.9K	—	—	SEC
2026-04-01	Petterson Lasse	CEO & President	J — Other acquisition / disposition	1.57M	—	—	SEC
2026-04-01	Kornblau Scott Lee	SVP & CFO	A — Grant or award	90.5K	—	—	SEC
2026-04-01	JOHANSON DAVID	SVP-Project Acquisition & Ops	J — Other acquisition / disposition	191.6K	—	—	SEC
2026-04-01	JOHANSON DAVID	SVP-Project Acquisition & Ops	A — Grant or award	71.9K	—	—	SEC
2026-04-01	GUNSTEN CHRISTOPHER	SVP-Proj Svcs & Fleet Engineer	A — Grant or award	71.9K	—	—	SEC

All transactions sourced from SEC EDGAR Form 4 filings for Great Lakes Dredge Dock CORP (GLDD). Updated in real time as new filings are submitted to the SEC.

Recent GLDD Form 8-K Material Events

2026-04-01 — Item 1.01, 1.02, 2.01, 3.01, 3.03, 5.01, 5.02, 5.03, 8.01, 9.01 · Acquisition · neutral [SEC]
Great Lakes Dredge & Dock Corporation's merger with Saltchuk Resources, Inc. has been completed following a tender offer that expired on March 31, 2026. The offer successfully acquired approximately 79.88% of outstanding shares at $17.00 per share, satisfying the conditions for m
2026-03-20 — Item 5.02 · Leadership · neutral [SEC]
David J. Johanson, Senior Vice President of Project Acquisition and Operations at Great Lakes Dredge & Dock Corporation, announced his retirement effective March 27, 2026. The company will enter into a retirement agreement providing continued vesting of equity awards.
2026-03-18 — Item 8.01, 9.01 · Financing · neutral [SEC]
Saltchuk Resources, Inc. has commenced a cash tender offer to purchase Great Lakes Dredge & Dock's outstanding 5.25% Senior Notes due 2029, with a concurrent consent solicitation to amend the indenture and eliminate restrictive covenants and certain events of default. This repres
2026-02-23 — Item 2.02, 9.01 · Earnings · neutral [SEC]
Great Lakes Dredge & Dock Corporation issued an earnings release on February 23, 2026, announcing financial results for Q4 2025 and full-year 2025. This is a routine quarterly earnings announcement with no disclosed surprises, guidance changes, or material operational development

Recent Insider Filings

2026-04-01 — Schiffer Vivienne (SVP, CLO, CCO & Corp Secretary)
2026-04-01 — Petterson Lasse (CEO & President)
2026-04-01 — Kornblau Scott Lee (SVP & CFO)
2026-04-01 — JOHANSON DAVID (SVP-Project Acquisition & Ops)
2026-04-01 — HANSON WILLIAM H (SVP, Market Development)

Form 4 Transaction Code Reference

SEC Form 4 transactions are reported with a one-letter code indicating the type of transaction. Common codes you'll see in GLDD insider filings:

P	Open-market purchase by the insider
S	Open-market sale by the insider
A	Grant, award, or other acquisition from the issuer
M	Exercise or conversion of derivative security (e.g. options)
F	Payment of exercise price or tax liability via share withholding
G	Bona-fide gift of securities
D	Disposition to the issuer (e.g. share buyback participation)
J	Other acquisition or disposition
X	Exercise of in-the-money or at-the-money derivative security
C	Conversion of derivative security
V	Transaction voluntarily reported earlier than required

GLDD Insider Trading — FAQ

What is the latest insider trade for GLDD?: Great Lakes Dredge Dock CORP (GLDD) had 0 insider filings in the last 90 days, with the most recent on 2026-04-01. InsiderAlpha tracks every Form 4, 10-K, 10-Q, and 8-K filing in real time.
How many insiders are buying GLDD stock?: 0 insider purchases of GLDD were filed in the last 90 days.
How many insiders are selling GLDD stock?: 0 insider sales of GLDD were filed in the last 90 days.
Where can I see GLDD SEC filings (Form 4, 10-K, 10-Q, 8-K)?: InsiderAlpha aggregates every GLDD SEC filing — Form 4 insider transactions, 10-K and 10-Q quarterly reports, and 8-K material event disclosures — in one timeline.

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