SEC FORM 3/A SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
 
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1. Name and Address of Reporting Person*
Mackie Douglas B

(Last) (First) (Middle)
GREAT LAKES DREDGE & DOCK CORPORATION
2122 YORK ROAD

(Street)
OAK BROOK IL 60523

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
12/21/2006
3. Issuer Name and Ticker or Trading Symbol
Great Lakes Dredge & Dock CORP [ GLDD ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
X Director 10% Owner
X Officer (give title below) Other (specify below)
President and CEO
5. If Amendment, Date of Original Filed (Month/Day/Year)
12/26/2006
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock, par value $0.0001 6,000(1) I Common Stock held by the wife of Douglas B. Mackie
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Warrants to purchase Common Stock, par value $0.0001 12/21/2006 07/19/2007 Common Stock, par value $0.0001 6,000(2) 5 I Warrants to purchase Common Stock held by the wife of Douglas B. Mackie
Explanation of Responses:
1. These shares were omitted from Mr. Mackie's original Form 3, and were also omitted from one Form 4 filed by Mr. Mackie on March 21, 2007.
2. These warrants to purchase common stock were incorrectly characterized as directly owned on Mr. Mackie's original Form 3.
/s/ Douglas B. Mackie 06/27/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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