Great Lakes Dredge & Dock CORP — Director's Dealing 2021

Jan 8, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Great Lakes Dredge & Dock CORP (GLDD)
CIK: 0001372020
Period of Report: 2021-01-06

Reporting Person: Simonelli David E (Chief Operating Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-01-06	Common Stock	S	36025	$14.2706	Disposed	308743	Direct
2021-01-06	Common Stock	M	20000	$6.45	Acquired	328743	Direct
2021-01-06	Common Stock	S	20000	$13.82	Disposed	308743	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-01-06	Employee Stock Option	$6.45	M	20000	Disposed	2022-06-06	Common Stock (20000)	Direct

Footnotes

F1: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 16, 2020.

F2: The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $14.015 to $14.55, inclusive. The reporting person undertakes to provide to Great Lakes Dredge & Dock Corporation, any security holder of Great Lakes Dredge & Dock Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

F3: Represents an exercise of vested employee stock options granted on June 6, 2012 under the Great Lakes Dredge & Dock Corporation 2007 Long-Term Incentive Plan.

F4: The options vested in three equal installments beginning June 6, 2013.