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[Form 4] Great Lakes Dredge & Dock Corporation Insider Trading Activity

Filing Impact
(High)
Filing Sentiment
(Negative)
Form Type
4
Rhea-AI Filing Summary

Scott Lee Kornblau, SVP & CFO of Great Lakes Dredge & Dock Corp. (GLDD), reported the sale of 59,805 shares of GLDD common stock on 08/11/2025. The filing shows the sale was executed pursuant to a Rule 10b5-1 trading plan adopted May 9, 2025, with a reported weighted average sale price of $11.476 and individual trade prices ranging from $11.36 to $11.68.

After the reported transactions the Form 4 lists 112,130.24 as the amount of securities beneficially owned following the sale. The Form 4 was submitted by one reporting person and signed by an attorney-in-fact acting under power of attorney.

Scott Lee Kornblau, SVP & CFO di Great Lakes Dredge & Dock Corp. (GLDD), ha comunicato la vendita di 59,805 azioni ordinarie GLDD in data 08/11/2025. Il documento indica che la vendita 猫 stata eseguita ai sensi di un piano di negoziazione Rule 10b5-1 adottato il 9 maggio 2025, con un prezzo medio ponderato di vendita riportato di $11.476 e prezzi delle singole operazioni compresi tra $11.36 e $11.68.

Dopo le operazioni segnalate, il Modulo 4 riporta 112,130.24 come quantit脿 di titoli detenuti a beneficio dopo la vendita. Il Modulo 4 猫 stato presentato da una sola persona segnalante e firmato da un mandatario che ha agito in virt霉 di una procura.

Scott Lee Kornblau, SVP y CFO de Great Lakes Dredge & Dock Corp. (GLDD), inform贸 la venta de 59,805 acciones ordinarias de GLDD el 08/11/2025. El documento muestra que la venta se ejecut贸 conforme a un plan de negociaci贸n Rule 10b5-1 adoptado el 9 de mayo de 2025, con un precio de venta promedio ponderado reportado de $11.476 y precios individuales de las operaciones que oscilaron entre $11.36 y $11.68.

Tras las operaciones informadas, el Formulario 4 enumera 112,130.24 como la cantidad de valores de los que se beneficia tras la venta. El Formulario 4 fue presentado por una sola persona informante y firmado por un apoderado que actu贸 en virtud de un poder.

Great Lakes Dredge & Dock Corp. (GLDD)鞚� SVP 瓴� CFO鞚� Scott Lee Kornblau電� 08/11/2025鞐� GLDD 氤错喌欤� 59,805欤茧ゼ 毵り皝頄堧嫟瓿� 氤搓碃頄堨姷雼堧嫟. 鞝滌稖 靹滊鞐� 霐半ゴ氅� 鞚� 毵り皝鞚� 2025雲� 5鞗� 9鞚� 毂勴儩霅� Rule 10b5-1 瓯半灅瓿勴殟鞐� 霐半澕 鞁ろ枆霅橃棃鞙茧┌, 氤搓碃霅� 臧�欷� 韽夑窢 毵り皝臧�電� $11.476鞚搓碃 臧滊硠 瓯半灅 臧�瓴╈潃 $11.36鞐愳劀 $11.68 靷澊鞓�鞀惦媹雼�.

氤搓碃霅� 瓯半灅 鞚错泟 Form 4鞐愲姅 毵り皝 頉� 鞁れ鞝侅溂搿� 氤挫湢頃� 歃濌秾 靾橂 112,130.24臧� 旮办灛霅橃柎 鞛堨姷雼堧嫟. Form 4電� 頃� 氇呾潣 氤搓碃鞛愱皜 鞝滌稖頄堨溂氅�, 鞙勳瀯鞛レ潉 攴缄卑搿� 頃� 雽�毽澑鞚� 靹滊獏頄堨姷雼堧嫟.

Scott Lee Kornblau, SVP et CFO de Great Lakes Dredge & Dock Corp. (GLDD), a d茅clar茅 la vente de 59,805 actions ordinaires GLDD le 08/11/2025. Le dossier indique que la vente a 茅t茅 ex茅cut茅e en vertu d'un plan de trading Rule 10b5-1 adopt茅 le 9 mai 2025, avec un prix de vente moyen pond茅r茅 d茅clar茅 de $11.476 et des prix individuels des transactions allant de $11.36 脿 $11.68.

Apr猫s les op茅rations signal茅es, le Formulaire 4 indique 112,130.24 comme nombre de titres d茅tenus 脿 titre b茅n茅ficiaire apr猫s la vente. Le Formulaire 4 a 茅t茅 soumis par une seule personne d茅clarante et sign茅 par un mandataire agissant en vertu d'une procuration.

Scott Lee Kornblau, SVP & CFO von Great Lakes Dredge & Dock Corp. (GLDD), meldete am 08/11/2025 den Verkauf von 59,805 Aktien der GLDD-Stammaktien. Die Einreichung weist aus, dass der Verkauf gem盲脽 einem am 9. Mai 2025 angenommenen Rule 10b5-1-Handelsplan ausgef眉hrt wurde, mit einem gemeldeten gewichteten durchschnittlichen Verkaufspreis von $11.476 und Einzelhandelspreisen zwischen $11.36 und $11.68.

Nach den gemeldeten Transaktionen gibt das Formular 4 112,130.24 als Anzahl der wirtschaftlich gehaltenen Wertpapiere nach dem Verkauf an. Das Formular 4 wurde von einer meldenden Person eingereicht und von einem Bevollm盲chtigten mit Vollmacht unterzeichnet.

Positive
  • Sale executed under a Rule 10b5-1 trading plan, indicating the transaction followed a pre-established procedure
  • Weighted average price disclosed ($11.476) and per-trade price range provided ($11.36鈥�$11.68), improving transparency
Negative
  • Officer sale of 59,805 shares reduces executive ownership and could be viewed negatively by some investors
  • Remaining beneficial ownership figure is reported (112,130.24) but context versus total outstanding shares is not provided in this filing

Insights

TL;DR: The CFO sold 59,805 GLDD shares under a pre-established 10b5-1 plan; disclosure provides clear pricing and remaining ownership.

The transaction is a routine, pre-planned insider sale rather than an opportunistic trade, which reduces the likelihood that it was motivated by undisclosed company developments. The filing discloses a weighted average price of $11.476 and a per-trade range of $11.36鈥�$11.68, enabling investors to calculate proceeds. Materiality for investors depends on the size of the sale relative to total insider holdings and free float, information not included in this Form 4.

TL;DR: Use of a Rule 10b5-1 plan signals procedural compliance but the insider disposition reduces executive ownership.

The filing confirms the sale was executed under a documented 10b5-1 plan adopted May 9, 2025, which typically provides an affirmative defense to allegations of trading on material nonpublic information. However, the record also shows the officer's beneficial holdings declined by the reported amount to 112,130.24 shares, which may be relevant to governance-minded investors tracking insider alignment with shareholders.

Scott Lee Kornblau, SVP & CFO di Great Lakes Dredge & Dock Corp. (GLDD), ha comunicato la vendita di 59,805 azioni ordinarie GLDD in data 08/11/2025. Il documento indica che la vendita 猫 stata eseguita ai sensi di un piano di negoziazione Rule 10b5-1 adottato il 9 maggio 2025, con un prezzo medio ponderato di vendita riportato di $11.476 e prezzi delle singole operazioni compresi tra $11.36 e $11.68.

Dopo le operazioni segnalate, il Modulo 4 riporta 112,130.24 come quantit脿 di titoli detenuti a beneficio dopo la vendita. Il Modulo 4 猫 stato presentato da una sola persona segnalante e firmato da un mandatario che ha agito in virt霉 di una procura.

Scott Lee Kornblau, SVP y CFO de Great Lakes Dredge & Dock Corp. (GLDD), inform贸 la venta de 59,805 acciones ordinarias de GLDD el 08/11/2025. El documento muestra que la venta se ejecut贸 conforme a un plan de negociaci贸n Rule 10b5-1 adoptado el 9 de mayo de 2025, con un precio de venta promedio ponderado reportado de $11.476 y precios individuales de las operaciones que oscilaron entre $11.36 y $11.68.

Tras las operaciones informadas, el Formulario 4 enumera 112,130.24 como la cantidad de valores de los que se beneficia tras la venta. El Formulario 4 fue presentado por una sola persona informante y firmado por un apoderado que actu贸 en virtud de un poder.

Great Lakes Dredge & Dock Corp. (GLDD)鞚� SVP 瓴� CFO鞚� Scott Lee Kornblau電� 08/11/2025鞐� GLDD 氤错喌欤� 59,805欤茧ゼ 毵り皝頄堧嫟瓿� 氤搓碃頄堨姷雼堧嫟. 鞝滌稖 靹滊鞐� 霐半ゴ氅� 鞚� 毵り皝鞚� 2025雲� 5鞗� 9鞚� 毂勴儩霅� Rule 10b5-1 瓯半灅瓿勴殟鞐� 霐半澕 鞁ろ枆霅橃棃鞙茧┌, 氤搓碃霅� 臧�欷� 韽夑窢 毵り皝臧�電� $11.476鞚搓碃 臧滊硠 瓯半灅 臧�瓴╈潃 $11.36鞐愳劀 $11.68 靷澊鞓�鞀惦媹雼�.

氤搓碃霅� 瓯半灅 鞚错泟 Form 4鞐愲姅 毵り皝 頉� 鞁れ鞝侅溂搿� 氤挫湢頃� 歃濌秾 靾橂 112,130.24臧� 旮办灛霅橃柎 鞛堨姷雼堧嫟. Form 4電� 頃� 氇呾潣 氤搓碃鞛愱皜 鞝滌稖頄堨溂氅�, 鞙勳瀯鞛レ潉 攴缄卑搿� 頃� 雽�毽澑鞚� 靹滊獏頄堨姷雼堧嫟.

Scott Lee Kornblau, SVP et CFO de Great Lakes Dredge & Dock Corp. (GLDD), a d茅clar茅 la vente de 59,805 actions ordinaires GLDD le 08/11/2025. Le dossier indique que la vente a 茅t茅 ex茅cut茅e en vertu d'un plan de trading Rule 10b5-1 adopt茅 le 9 mai 2025, avec un prix de vente moyen pond茅r茅 d茅clar茅 de $11.476 et des prix individuels des transactions allant de $11.36 脿 $11.68.

Apr猫s les op茅rations signal茅es, le Formulaire 4 indique 112,130.24 comme nombre de titres d茅tenus 脿 titre b茅n茅ficiaire apr猫s la vente. Le Formulaire 4 a 茅t茅 soumis par une seule personne d茅clarante et sign茅 par un mandataire agissant en vertu d'une procuration.

Scott Lee Kornblau, SVP & CFO von Great Lakes Dredge & Dock Corp. (GLDD), meldete am 08/11/2025 den Verkauf von 59,805 Aktien der GLDD-Stammaktien. Die Einreichung weist aus, dass der Verkauf gem盲脽 einem am 9. Mai 2025 angenommenen Rule 10b5-1-Handelsplan ausgef眉hrt wurde, mit einem gemeldeten gewichteten durchschnittlichen Verkaufspreis von $11.476 und Einzelhandelspreisen zwischen $11.36 und $11.68.

Nach den gemeldeten Transaktionen gibt das Formular 4 112,130.24 als Anzahl der wirtschaftlich gehaltenen Wertpapiere nach dem Verkauf an. Das Formular 4 wurde von einer meldenden Person eingereicht und von einem Bevollm盲chtigten mit Vollmacht unterzeichnet.

SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
 Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Kornblau Scott Lee
(Last) (First) (Middle)
C/O GREAT LAKES DREDGE & DOCK CORP.
9811 KATY FREEWAY, SUITE 1200
(Street)
HOUSTON TX 77024
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
Great Lakes Dredge & Dock CORP [ GLDD ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
SVP & CFO
3. Date of Earliest Transaction (Month/Day/Year)
08/11/2025
4. If Amendment, Date of Original Filed (Month/Day/Year)
 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 08/11/2025 S 59,805(1) D $11.476(2) 112,130.24 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Explanation of Responses:
1. The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 9, 2025.
2. Represents the weighted average price. The shares were sold in multiple transactions ranging from $11.36 to $11.68, inclusive. Upon request by the Commission staff, the issuer or security holder of the issuer, the reporting person will provide information regarding the number of shares disposed at each separate price.
/s/Vivienne R. Schiffer, by Power of Attorney 08/13/2025
** 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 4 (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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

Source:

FAQ

What did GLDD insider Scott Lee Kornblau do on 08/11/2025?

The Form 4 reports a sale of 59,805 shares of Great Lakes Dredge & Dock (GLDD) stock on 08/11/2025.

Was the GLDD sale part of a trading plan?

Yes. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 9, 2025.

At what price were the GLDD shares sold?

The Form 4 shows a weighted average sale price of $11.476, with individual transactions ranging from $11.36 to $11.68.

How many GLDD shares does the officer own after the sale?

The filing lists 112,130.24 as the amount of securities beneficially owned following the reported transactions.

Who filed the Form 4 for GLDD insider activity?

The Form 4 was filed by reporting person Kornblau Scott Lee (SVP & CFO) and signed by an attorney-in-fact acting under power of attorney.
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[Form 4] Great Lakes Dredge & Dock Corporation Insider Trading Activity
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[Form 4] Great Lakes Dredge & Dock Corporation Insider Trading Activity

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Engineering & Construction
Heavy Construction Other Than Bldg Const - Contractors
United States
HOUSTON