UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No. 1)*

Great Lakes Dredge & Dock Corporation

(Name of Issuer)

Common Stock

(Title of Class of Securities)

390607109

(CUSIP Number)

December 31, 2021

(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

☒ Rule 13d-1(b)

☐ Rule 13d-1(c)

☐ Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13G

CUSIP No. 390607109

1	Names of Reporting Persons   Russell Investments Group, Ltd.   IRS Identification No. of Above Persons (Entities Only) 98-1320542
2	Check the appropriate box if a member of a Group (see instructions)   (a)  ☐        (b)  ☐
3	Sec Use Only
4	Citizenship or Place of Organization   Seattle, WA USA

Number of Shares  Beneficially  Owned by Each Reporting Person With:	5	Sole Voting Power   0
	6	Shared Voting Power
	7	Sole Dispositive Power
	8	Shared Dispositive Power   0

9	Aggregate Amount Beneficially Owned by Each Reporting Person   0
10	Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)   ☐
11	Percent of class represented by amount in row (9)   0.0%
12	Type of Reporting Person (See Instructions)   HC

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Item 1.

(a) Name of Issuer: Great Lakes Dredge & Dock Corporation

(b) Address of Issuer’s Principal Executive Offices:

9811 Katy Freeway, Suite 1200

Houston, TX 77024

Item 2.

(a) Name of Person Filing:

Russell Investments Group, Ltd.

(b) Address of Principal Business Office or, if None, Residence:

1301 Second Ave, Suite 1800

Seattle, WA 98101

(c) Citizenship:

Seattle, WA USA

(d) Title and Class of Securities:

Common Stock

(e) CUSIP No.:

390607109

Item 3. If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a) ☐ Broker or dealer registered under Section 15 of the Act;

(b) ☐ Bank as defined in Section 3(a)(6) of the Act;

(c) ☐ Insurance company as defined in Section 3(a)(19) of the Act;

(d) ☐ Investment company registered under Section 8 of the Investment Company Act of 1940;

(e) ☐An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

(f) ☐ An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

(g) ☒ A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G);

(h) ☐ A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) ☐ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940;

(j) ☐ A non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J);

(k) ☐ Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

Item 4. Ownership

(a) Amount Beneficially Owned:

0

(b) Percent of Class:

0.0%

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(c) Number of shares as to which such person has:

(i) Sole power to vote or to direct the vote:

0

(ii) Shared power to vote or to direct the vote:

0

(iii) Sole power to dispose or to direct the disposition of:

0

(iv) Shared power to dispose or to direct the disposition of:

0

Item 5. Ownership of Five Percent or Less of a Class.

If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [X].

Item 6. Ownership of more than Five Percent on Behalf of Another Person.

Certain indirect clients that are advised by Russell Investments Group have the right to receive and the ultimate power to direct the receipt of dividends from, or the proceeds of the sale of such securities.

Item 7. Identification and classification of the subsidiary which acquired the security being reported on by the parent holding company or control person.

Item 8. Identification and classification of members of the group.

Item 9. Notice of Dissolution of Group

Item 10. Certifications.

By signing below, I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: February 10, 2022

By: /s/ Mark E. Swanson

Name: Mark E. Swanson

Title: Global Head of Fund Services

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