Jennison Reports 1,029,264 GLDD Shares (1.5%)

GREAT LAKES DREDGE & DOCK CO filing an Amendment No. 19 to Schedule 13G/A: Jennison Associates LLC reports beneficial ownership of 1,029,264 shares of common stock, representing 1.5% of the class as of 03/31/2026.

Accepted by SEC EDGAR 05/06/2026 - 04:11 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

GREAT LAKES DREDGE & DOCK CO filing an Amendment No. 19 to Schedule 13G/A: Jennison Associates LLC reports beneficial ownership of 1,029,264 shares of common stock, representing 1.5% of the class as of 03/31/2026. The filing shows Jennison holds sole voting power for 1,029,264 shares and shared dispositive power for 1,029,264. The amendment was signed on 05/06/2026.

Key Figures

Shares beneficially owned: 1,029,264 shares Percent of class: 1.5% Sole voting power: 1,029,264 shares +3 more

6 metrics

Shares beneficially owned 1,029,264 shares Amount beneficially owned reported in Item 4

Percent of class 1.5% Percent of class reported in Item 4

Sole voting power 1,029,264 shares Sole power to vote reported in Item 4

Shared dispositive power 1,029,264 shares Shared power to dispose reported in Item 4

Ownership as of 03/31/2026 Reporting date shown in header

Amendment signature date 05/06/2026 Signature date in filing

Key Terms

Schedule 13G/A, beneficially owned, sole voting power, dispositive power

4 terms

Schedule 13G/A regulatory

"Amendment No. 19 ) GREAT LAKES DREDGE & DOCK CO 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.

beneficially owned regulatory

"Item 4. | Ownership (a) | Amount beneficially owned: 1029264"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power regulatory

"(i) Sole power to vote or to direct the vote: 1029264"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power regulatory

"(iii) Sole power to dispose or to direct the disposition of: 0"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Jennison Associates report in GLDD?

Jennison Associates reports owning 1,029,264 GLDD shares (1.5%). This ownership figure is listed under Item 4 of the Schedule 13G/A and is dated as of 03/31/2026, with the amendment signed on 05/06/2026.

Does Jennison have voting control over its GLDD shares?

Yes — Jennison reports sole voting power for 1,029,264 shares. The filing lists sole voting power equal to its total beneficial holdings, indicating it can direct votes for those shares as reported on the Schedule 13G/A.

What type of SEC filing is this for GLDD and why was it filed?

This is a Schedule 13G/A (an amendment) reporting beneficial ownership. Schedule 13G/A amends prior passive-investor ownership disclosures; here it updates Jennison Associates' reported position in GLDD common stock.

When was the Schedule 13G/A amendment for GLDD signed?

The amendment was signed on 05/06/2026. The ownership amount is reported as of 03/31/2026, and the signature block shows Beata Markowicz, Senior Vice President, Compliance, dated 05/06/2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 19)

GREAT LAKES DREDGE & DOCK CO

(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

Jennison Associates LLC

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 1,029,264.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,029,264.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,029,264.00

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)

1.5 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: GREAT LAKES DREDGE & DOCK CO
(b)	Address of issuer's principal executive offices: 9811 Katy Freeway, Suite 1200, Houston, TX 77024
Item 2.
(a)	Name of person filing: Jennison Associates LLC
(b)	Address or principal business office or, if none, residence: 55 East 52nd Street, New York, NY 10055
(c)	Citizenship: USA
(d)	Title of 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 (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: 1029264
(b)	Percent of class: 1.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1029264
	(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: 1029264
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
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.

Jennison Associates LLC

Signature:	Beata Markowicz
Name/Title:	Senior Vice President, Compliance
Date:	05/06/2026