Schiffer Vivienne 4/A

What Happened
Vivienne Schiffer, SVP, Chief Legal Officer, Chief Compliance Officer and Corporate Secretary of Great Lakes Dredge & Dock Corp (GLDD), was granted 18,035 restricted stock units (RSUs) on May 8, 2025. The Form 4/A reports this as an award (Transaction Code: A). No per-share price or total dollar value is reported for the grant.

Key Details

• Transaction date: May 8, 2025 (award of 18,035 RSUs)
• Filing: original Form 4 filed May 12, 2025; this is an amended Form 4/A filed March 25, 2026
• Price: N/A (typical for RSU grants)
• Shares owned after transaction: not specified in the excerpt provided
• Footnote: Amendment corrects an administrative error — the original filing mistakenly listed a March 15, 2026 vesting start; the correct vesting begins May 8, 2026 (Footnote F1)
• Transaction code: A = Award/Grant

Context
RSU grants are compensation and do not represent an open-market purchase or sale; they typically vest over time (here, vesting begins May 8, 2026). This filing is an administrative amendment to correct the vesting date; the original Form 4 was filed within the two-business-day window (May 12, 2025) and the amendment simply updates the record.