BlackRock (GLDD) holds 6.70M shares, 10.0% reported in 13G/A

Rhea-AI Filing Summary

Great Lakes Dredge & Dock Corporation: BlackRock, Inc. reports beneficial ownership of 6,701,811 shares of common stock, representing 10.0% of the class as of 02/28/2026.

The filing states BlackRock's Reporting Business Units hold these shares, with 6,585,493 shares of sole voting power and 6,701,811 shares of sole dispositive power. The schedule is an amendment (No. 16) to the previously filed ownership disclosure.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 16)

GREAT LAKES DREDGE & DOCK CORPORATION

(Name of Issuer)

Common Stock

(Title of Class of Securities)

02/28/2026

(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)

SCHEDULE 13G

CUSIP Number(s):

1

Names of Reporting Persons

BlackRock, Inc.

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 6,585,493.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 6,701,811.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,701,811.00

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)

10.0 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

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: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 390607109
Item 4.	Ownership
(a)	Amount beneficially owned: 6701811
(b)	Percent of class: 10.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 6585493
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 6701811
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of GREAT LAKES DREDGE & DOCK CORPORATION. No one person's interest in the common stock of GREAT LAKES DREDGE & DOCK CORPORATION is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and 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, other than activities solely in connection with a nomination under ?? 240.14a-11.

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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	03/04/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

What stake does BlackRock hold in GLDD?

BlackRock beneficially owns 6,701,811 shares, equal to 10.0% of the class as of 02/28/2026. The figure is reported on a Schedule 13G/A and represents beneficial ownership by identified Reporting Business Units of BlackRock.

Who at BlackRock signed the GLDD Schedule 13G/A amendment?

Spencer Fleming, Managing Director, signed the filing dated 03/04/2026. The cover indicates the ownership amounts are attributed to BlackRock, Inc.'s Reporting Business Units rather than other business units.

How many voting and dispositive powers does BlackRock report for GLDD shares?

BlackRock reports 6,585,493 shares of sole voting power and 6,701,811 shares of sole dispositive power. The filing shows zero shared voting and dispositive power for these holdings.

Does the filing identify who receives dividends or proceeds for GLDD shares?

The filing states various persons have rights to dividends or sale proceeds, and no single person's interest exceeds 5% of outstanding shares. It clarifies that investor lists for registered investment companies need not be provided.

What form and amendment number is this ownership disclosure for GLDD?

This is a Schedule 13G/A (Amendment No. 16) reporting beneficial ownership of common stock. The cover shows the reporting date 02/28/2026 and the signature dated 03/04/2026.