Great Lakes Dredge & Dock Corp ownership update: Dimensional Fund Advisors reports beneficial ownership of 3,386,372 shares, representing 5.1% of the company's common stock. The filing states Dimensional has sole voting power for 3,347,197 shares and sole dispositive power for 3,386,372 shares, and disclaims beneficial ownership because the shares are owned by client funds.
The filing explains these shares are held by multiple registered investment funds advised or sub‑advised by Dimensional; no single fund is known to exceed 5% of the class. The report is an amendment to a prior Schedule 13G.
Positive
None.
Negative
None.
Insights
Dimensional reports a passive, disclosed >5% stake held via client funds.
The filing shows 3,386,372 shares (5.1%) are owned by funds advised or sub‑advised by Dimensional, with voting and dispositive powers allocated as disclosed. Dimensional explicitly disclaims beneficial ownership because legal ownership rests with the Funds.
Key dependency is fund-level holdings and voting arrangements; the filing notes that no single Fund is known to exceed 5%. Subsequent filings would show material changes to this passive position.
Key Figures
Shares beneficially owned:3,386,372 sharesPercent of class:5.1%Sole voting power:3,347,197 shares+2 more
5 metrics
Shares beneficially owned3,386,372 sharesAmount beneficially owned reported in Schedule 13G/A
Percent of class5.1%Percent of GLDD common stock reported
Sole voting power3,347,197 sharesSole power to vote or direct the vote
Sole dispositive power3,386,372 sharesSole power to dispose or direct disposition
Schedule 13G/A, Sole dispositive power, Investment Company Act funds
3 terms
Schedule 13G/Aregulatory
"Amendment No. 13 ) Great Lakes Dredge & Dock Corp Common Stock"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
Sole dispositive powerfinancial
"Sole power to dispose or to direct the disposition of: 3,386,372"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Investment Company Act fundsregulatory
"investment companies registered under the Investment Company Act of 1940"
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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 13)
Great Lakes Dredge & Dock Corp
(Name of Issuer)
Common Stock
(Title of Class of Securities)
390607109
(CUSIP Number)
03/31/2026
(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)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
390607109
1
Names of Reporting Persons
Dimensional Fund Advisors LP
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
3,347,197.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
3,386,372.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
3,386,372.00
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)
5.1 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Great Lakes Dredge & Dock Corp
(b)
Address of issuer's principal executive offices:
9811 Katy Freeway, Suite 1200, Houston, TX 77024
Item 2.
(a)
Name of person filing:
Dimensional Fund Advisors LP
(b)
Address or principal business office or, if none, residence:
6300 Bee Cave Road, Building One, Austin, TX 78746
(c)
Citizenship:
Delaware Limited Partnership
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
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 (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations 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 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
3,386,372 ** see Note 1 **
** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)
Percent of class:
5.1 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
3,347,197** see Note 1 **
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
3,386,372** see Note 1 **
(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.
The Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all 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.
Not Applicable
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.
What stake does Dimensional Fund Advisors report in GLDD?
Dimensional reports beneficial ownership of 3,386,372 shares of GLDD, representing 5.1% of the common stock. The shares are held by investment funds advised or sub‑advised by Dimensional, per the filing.
How much voting power does Dimensional have in GLDD?
Dimensional reports sole voting power for 3,347,197 shares and shared voting power of 0 shares. These figures reflect Dimensional's voting authority over fund‑owned shares.
Does Dimensional claim beneficial ownership of the GLDD shares?
No; Dimensional disclaims beneficial ownership, stating the securities are owned by client Funds advised or sub‑advised by Dimensional. Ownership is reported because Dimensional may have voting or investment power over fund holdings.
Are any individual funds reported as holding more than 5% of GLDD?
The filing states that, to Dimensional's knowledge, no single Fund holds more than 5% of the class. The reported 5.1% stake reflects aggregate holdings across multiple Funds.
Who signed the Schedule 13G/A on behalf of Dimensional?
The filing is signed by Selwyn Notelovitz, Global Chief Compliance Officer, certifying the amendment to the Schedule 13G on behalf of Dimensional Fund Advisors.
