Great Lakes Dredge & Dock CORP — Director's Dealing 2012

Aug 31, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Great Lakes Dredge & Dock CORP (GLDD)
CIK: 0001372020
Period of Report: 2012-08-29

Reporting Person: Johnson Kyle D (Senior Vice President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-08-29	Common Stock	M	21722	$3.82	Acquired	91620	Direct
2012-08-29	Common Stock	S	21722	$7.48	Disposed	69898	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-08-29	Employee stock option (right to buy)	$3.82	M	21722	Disposed	2019-05-13	Common Stock (21722)	Direct

Footnotes

F1: Represents an exercise of vested employee stock options granted on May 13, 2009 under the Great Lakes Dredge & Dock Corporation 2007 Long-Term Incentive Plan.

F2: The option vests in three equal annual installments beginning May 13, 2010.