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Great Lakes Dredge & Dock CORP SEC Filings

Filed On Filing
14 Jul 2026 SCHEDULE 13G/A
06 May 2026 SCHEDULE 13G/A
30 Apr 2026 SCHEDULE 13G
28 Apr 2026 SCHEDULE 13G/A
13 Apr 2026 15-12G
09 Apr 2026 SCHEDULE 13G/A
02 Apr 2026 EFFECT
01 Apr 2026 Form 4: Steger Ronald, Director

Granted 1,625 Deferred Stock Units · Disposed of 20,404 shares (Tender Offer) · Disposed of 45,068 Deferred Stock Units (Disposition to Issuer)

01 Apr 2026 Form 4: Bayer Ryan, VP & CAO

Received 5,607 shares as a grant or award · Disposed of 37,380 shares (Tender Offer)

01 Apr 2026 Form 4: Schiffer Vivienne, SVP, CLO, CCO & Corp Secretary

Received 28,945 shares as a grant or award · Disposed of 144,817 shares (Tender Offer)

01 Apr 2026 Form 4: Petterson Lasse, Director

Received 206,445 shares as a grant or award · Disposed of 1,568,290.29 shares (Tender Offer)

01 Apr 2026 Form 4: Kornblau Scott Lee, SVP & CFO

Received 90,518 shares as a grant or award · Disposed of 244,126.24 shares (Tender Offer)

01 Apr 2026 Form 4: Johanson David, SVP-Project Acquisition & Ops

Received 521.257 shares as a grant or award ($5.64K) · Received 71,860 shares as a grant or award · Disposed of 191,597.5164 shares (Tender Offer)

01 Apr 2026 Form 4: Hanson William H, SVP, Market Development

Received 13,631 shares as a grant or award · Disposed of 90,852.743 shares (Tender Offer)

01 Apr 2026 Form 4: Gunsten Christopher, SVP-Proj Svcs & Fleet Engineer

Received 71,860 shares as a grant or award · Disposed of 182,496 shares (Tender Offer)

01 Apr 2026 Form 4: Beyko Eleni, SVP - Offshore Energy

Received 25,505 shares as a grant or award · Disposed of 151,312 shares (Tender Offer)

01 Apr 2026 Form 4: Shipp Earl L, Director

Disposed of 42,619 shares (Tender Offer)

01 Apr 2026 Form 4: Shanahan Kathleen M, Director

Granted 1,485 Deferred Stock Units · Disposed of 10,336 Deferred Stock Units (Disposition to Issuer) · Disposed of 76,375 shares (Tender Offer)

01 Apr 2026 Form 4: Dickerson Lawrence R, Director

Granted 2,938 Deferred Stock Units · Disposed of 86,217 shares (Tender Offer) · Disposed of 76,962 Deferred Stock Units (Disposition to Issuer)

01 Apr 2026 Form 4: Armstrong Dana A, Director

Disposed of 8,436 shares (Tender Offer)

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