Every Form 4 that Great Lakes Dredge & Dock Corporation (GLDD) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A Form 4 covers the transactions officers, directors and large holders report, so if you follow GLDD and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full GLDD filings page.
Great Lakes Dredge & Dock Corporation SVP, CLO, CCO & Corporate Secretary Vivienne Schiffer reported equity changes tied to the company’s merger with Saltchuk Resources. On April 1, 2026, she acquired 28,945 shares of common stock at $0.00 per share through a grant or award, reflecting the vesting of performance-based restricted stock units under the merger terms.
That same day, 144,817 common shares held directly were disposed of in a tender-offer transaction, leaving her with 0 directly owned shares after the merger closed. Under the merger agreement, each Great Lakes share was cancelled and converted into the right to receive $17.00 in cash.
The filing notes prior holdings included 71,357 restricted stock units. At the effective time, 52,855 RSUs were cancelled for a cash payment based on the $17.00 merger consideration, while 18,502 RSUs were replaced with a cash-based award of equivalent value that keeps the original time-based vesting schedule.
Great Lakes Dredge & Dock CEO Lasse Petterson reported merger-related equity transactions. He was granted 206,445 shares of common stock at no cost upon full vesting of performance-based restricted stock units at the merger’s effective time, as specified in the Merger Agreement.
On the same date, 1,568,290.29 directly held shares of common stock were disposed of pursuant to a tender offer when Saltchuk’s merger subsidiary combined with the company, with each share converted into the right to receive $17.00 in cash, subject to tax withholding. Following this disposition, Petterson reported no directly held common shares.
The filing notes 503,878 restricted stock units in total, of which 375,541 RSUs were cancelled in exchange for cash equal to the underlying shares multiplied by the $17.00 merger consideration, while 128,337 RSUs were replaced by a cash-based award of equivalent value that keeps the original time-based vesting schedule.
Great Lakes Dredge & Dock SVP & CFO Scott Lee Kornblau reported equity changes tied to the company’s cash merger with Saltchuk Resources. On April 1, 2026, performance-based restricted stock units fully vested, resulting in an acquisition of 90,518 shares of common stock at no cost.
At the merger’s effective time, each share of Great Lakes common stock was cancelled and converted into the right to receive $17.00 in cash. Kornblau’s 244,126.24 directly held shares were disposed of pursuant to the tender offer, reducing his direct common stock holdings to zero.
The filing notes 149,614 restricted stock units, of which 123,910 RSUs were cancelled for cash based on the $17.00 merger consideration, while 25,704 RSUs were replaced with a cash-based award of equivalent value that keeps the same time-based vesting schedule.
Great Lakes Dredge & Dock Corporation SVP David Johanson reported mixed equity transactions tied to the company’s sale to Saltchuk Resources. On April 1, 2026, performance-based restricted stock units fully vested and 71,860 shares of common stock were acquired at no cost, reflecting equity awards settling at the merger’s effective time.
That same day, 191,597.5164 shares of common stock were disposed of in a transaction labeled as a tender-offer disposition, as each outstanding share of Great Lakes common stock was cancelled and converted into the right to receive $17.00 in cash, subject to tax withholding. After this cash-out, Johanson reported 0 common shares directly owned.
In a separate award-related transaction on March 25, 2026, he acquired 521.257 shares of common stock at $10.821 per share under the company’s 2025 Employee Stock Purchase Plan, which prices purchases at 85% of the closing price on a specified date. Footnotes also note that large blocks of restricted stock units were either converted into cash at the $17.00 merger consideration or replaced by equivalent cash-based awards with the same time-based vesting conditions.
Great Lakes Dredge & Dock Corporation senior vice president of market development William H. Hanson reported equity award and merger-related share activity. On April 1, 2026, his performance-based restricted stock units fully vested under the merger agreement, and his common shares were converted into cash at $17.00 per share.
The filing notes 33,233 restricted stock units in total, of which 24,785 were cancelled for a cash payment based on the $17.00 merger price and 8,448 were converted into a cash-based award with the same time-based vesting terms. Following the tender-offer related disposition, the Form 4 shows no remaining common stock directly held.
Great Lakes Dredge & Dock Corporation’s Form 4 shows SVP-Proj Svcs & Fleet Engineer Christopher Gunsten’s equity changing hands in connection with the closing of the Saltchuk Resources merger. Performance-based restricted stock units fully vested at the merger’s effective time, resulting in an acquisition of 71,860 shares of common stock at no cost.
Immediately afterward, a total of 182,496 common shares were disposed of pursuant to the tender offer, with each share converted into the right to receive $17.00 in cash. Following these transactions, Gunsten no longer directly holds Great Lakes common stock, while certain RSUs were cashed out and others converted into a cash-based award that retains the prior time-based vesting conditions.
Great Lakes Dredge & Dock SVP Eleni Beyko reported merger-related stock changes. On April 1, 2026, she acquired 25,505 shares of common stock as a grant or award, then all 151,312 directly held shares were disposed of pursuant to a tender offer in connection with the company’s merger.
Under the Merger Agreement with Saltchuk Resources’ Huron MergeCo, each share of Great Lakes Dredge & Dock common stock was cancelled at the effective time and converted into the right to receive $17.00 in cash, without interest and subject to tax withholdings. Footnotes state certain performance-based restricted stock units fully vested under the Merger Agreement, while 61,359 RSUs were cashed out at the merger price and 15,769 RSUs were replaced by an equivalent-value cash-based award with the same time-based vesting terms.
Great Lakes Dredge & Dock Corporation VP & CAO Ryan Bayer reported equity transactions tied to the completion of the Saltchuk merger. On April 1, 2026, 5,607 performance-based restricted stock units vested and were delivered as Common Stock under the Merger Agreement.
At the same Effective Time, all 37,380 outstanding shares of Common Stock held directly by Bayer were disposed of pursuant to the tender offer, with each share converted into the right to receive $17.00 in cash, before taxes. Following these actions, Bayer no longer holds Common Stock, though certain awards converted into cash-based arrangements.
Great Lakes Dredge & Dock director Ronald Steger reported routine transactions tied to the closing of a cash merger. In connection with the merger of Great Lakes Dredge & Dock Corporation into a wholly owned subsidiary of Saltchuk Resources, each share of common stock was converted into the right to receive $17.00 in cash. Steger’s 20,404 shares of common stock were disposed of pursuant to a tender offer, and 45,068 Deferred Stock Units (DSUs) were canceled and converted into a cash payment equal to the number of underlying shares multiplied by the $17.00 merger consideration. The filing also notes a grant of 1,625 DSUs on March 31, 2026 under the company’s Director Deferral Plan, which were included in the DSUs canceled at the merger effective time. Following these transactions, the Form 4 shows no remaining common stock or DSU holdings for Steger.
Great Lakes Dredge & Dock director Earl L. Shipp disposed of 42,619 shares of common stock pursuant to a tender offer tied to the company’s merger. According to the merger agreement, on April 1, 2026 each outstanding share of Great Lakes Dredge & Dock common stock was cancelled and converted into the right to receive $17.00 in cash, making the company a wholly owned subsidiary of Saltchuk Resources. Following this transaction, Shipp reported owning zero shares directly.
Great Lakes Dredge & Dock Corporation director Kathleen M. Shanahan reported transactions tied to the company’s cash merger with Saltchuk Resources. She disposed of 76,375 shares of Common Stock in a tender offer at $17.00 per share, leaving no directly held common shares.
On March 31, 2026 she received an award of 1,485 Deferred Stock Units (DSUs), bringing her total DSUs to 10,336. At the merger’s effective time on April 1, 2026, all 10,336 DSUs were cancelled and converted into cash equal to the number of underlying shares multiplied by the $17.00 merger consideration, leaving no remaining DSUs.
Great Lakes Dredge & Dock Corporation director Lawrence R. Dickerson reported transactions tied to the company’s cash merger with Saltchuk Resources. On April 1, 2026, all 86,217 shares of common stock he held were canceled in exchange for the right to receive $17.00 per share in cash.
At the same merger effective time, 76,962 deferred stock units (DSUs) credited to him were canceled and converted into a cash payment based on the same $17.00 per-share merger consideration. One day earlier, on March 31, 2026, he had been granted 2,938 DSUs under the company’s Director Deferral Plan. Following these transactions, he reported no remaining common stock or DSUs.
Great Lakes Dredge & Dock Corporation director Dana A. Armstrong disposed of 8,436 shares of common stock in connection with the company’s merger with Saltchuk Resources. The shares were tendered pursuant to a merger agreement under which each outstanding GLDD share was cancelled and converted into the right to receive $17.00 in cash, without interest and subject to tax withholding. Following this tender-offer disposition, Armstrong reported holding no direct GLDD shares.
Great Lakes Dredge & Dock Corp senior vice president of offshore energy, Eleni Beyko, reported a routine share disposition related to tax withholding. On this Form 4, 8,088 shares of common stock were withheld at $13.12 per share to cover tax obligations, rather than sold on the open market. Following this non‑market transaction, Beyko directly holds 125,807 shares of common stock.
Great Lakes Dredge & Dock Corp VP & CAO Ryan Bayer reported an acquisition of 10,126 shares of common stock on May 8, 2025, received as a grant or award at no stated purchase price. After this equity award, he directly holds 24,574 shares. The amended filing also corrects an administrative error by changing the vesting start date for the related restricted stock units from March 15, 2026 to the correct date of May 8, 2026.
BEYKO ELENI reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock Corp reported a routine equity award for SVP – Offshore Energy Eleni Beyko. On May 8, 2025, she received a grant of 15,376 shares of Common Stock at no purchase price as a compensation award, bringing her direct holdings to 105,514 shares.
This Form 4/A amends an earlier filing to fix an administrative error in the vesting schedule for the related Restricted Stock Units. The original filing listed vesting as beginning on March 15, 2026; the corrected vesting start date is May 8, 2026.
Great Lakes Dredge & Dock Corp senior vice president of market development William H. Hanson reported an acquisition of 8,237 shares of common stock as a grant or award on May 8, 2025, at no purchase price. After this grant, he directly holds 68,977 shares. The amended filing also corrects an earlier administrative error by stating that the related restricted stock units begin vesting on May 8, 2026, rather than March 15, 2026.
Great Lakes Dredge & Dock Corp senior vice president David Johanson reported an amended insider transaction reflecting a stock-based compensation award. On May 8, 2025, he acquired 13,179 shares of common stock at a stated price of $0.00 per share, increasing his direct holdings to 104,063.2594 shares.
The filing clarifies the vesting schedule for the related Restricted Stock Units. An earlier report had shown vesting beginning on March 15, 2026, but the corrected disclosure states that vesting will instead begin on May 8, 2026. This change is described as an administrative correction to the prior report.
GUNSTEN CHRISTOPHER reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock Corp reported an amended insider transaction for SVP-Proj Svcs & Fleet Engineer Christopher Gunsten. He received a grant of 13,179 shares of Common Stock on May 8, 2025 at a stated price of $0.00 per share, bringing his direct holdings to 85,952 shares. The amendment corrects an administrative error in the original Form 4 by changing the reported vesting start date for the related Restricted Stock Units from March 15, 2026 to the correct date of May 8, 2026.
Great Lakes Dredge & Dock Corp senior vice president and CFO Scott Lee Kornblau reported an acquisition of 25,058 shares of common stock as a grant or award on May 8, 2025, at a stated price of $0.00 per share. Following this award, his directly held position increased to 171,935.24 shares. The amended Form 4 clarifies that the vesting date for the related Restricted Stock Units begins on May 8, 2026, correcting a prior administrative error that had shown vesting beginning on March 15, 2026.
Petterson Lasse reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock Corp reported that CEO and President Lasse Petterson received a grant of 125,145 shares of Common Stock at no cash cost, increasing his directly held stake to 1,159,377.29 shares after the transaction.
This is an amended Form 4 that corrects an administrative error in a prior filing. The company clarifies that the related Restricted Stock Units begin vesting on May 8, 2026, rather than the previously reported March 15, 2026 vesting date.
Schiffer Vivienne reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock reported that SVP, CLO, CCO & Corporate Secretary Vivienne Schiffer received a grant of 18,035 shares of common stock on May 8, 2025 at no cash cost as part of her compensation, bringing her direct holdings to 82,181 shares. This amended Form 4 corrects an administrative error in the original filing by updating the vesting start date for related restricted stock units from March 15, 2026 to the correct date of May 8, 2026.
Great Lakes Dredge & Dock Corp’s SVP, Chief Legal Officer, Chief Compliance Officer and Corporate Secretary Vivienne Schiffer reported routine equity compensation activity in company common stock. On March 16, 2026, she received two stock awards of 14,213 and 10,454 shares, granted at no purchase price, following the satisfaction of performance conditions on performance-based restricted stock units granted in March 2023 and March 2024.
To cover tax obligations, a total of 10,125 shares were disposed of through tax-withholding transactions at $16.93 per share, which are not open-market sales. After these awards and related withholdings, Schiffer directly owned 115,872 shares of Great Lakes Dredge & Dock Corp common stock.
Great Lakes Dredge & Dock CORP CEO Lasse Petterson reported equity compensation activity in company stock. On March 16, 2026, he acquired 94,540 and 78,924 shares of common stock as grants tied to performance-based restricted stock units from March 15, 2023 and March 15, 2024. To cover tax obligations, 103,821 shares were withheld at $16.93 per share through several F-code transactions, which are not open-market sales. After these awards and tax withholdings, he directly holds 1,361,845.29 shares of common stock.
Great Lakes Dredge & Dock Corp’s SVP & CFO Scott Lee Kornblau reported stock-based compensation and related tax withholding, not open‑market trading. On March 16, 2026, he received two grants of common stock at $0.00 per share tied to performance-based restricted stock units from March 15, 2023 and March 15, 2024.
To cover tax obligations, a total of 22,258 shares of common stock were disposed of at $16.93 per share through tax-withholding transactions. Following these awards and withholdings, Kornblau directly holds 153,608 shares of Great Lakes Dredge & Dock common stock.
Great Lakes Dredge & Dock senior vice president David Johanson reported compensation-related stock activity in company common shares. On March 16, 2026, he received two grants totaling 12,646 and 8,444 shares at $0.00 per share, reflecting performance-based restricted stock units granted in 2023 and 2024.
To cover associated tax obligations, 1,659, 3,080, 1,029 and 2,057 shares were disposed of at $16.93 per share through tax-withholding transactions, which are not open-market sales. After these awards and withholdings, he directly holds 119,216.2594 common shares.
Great Lakes Dredge & Dock Corp executive William H. Hanson reported compensation-related stock activity, not open-market trading. On March 16, 2026, he received two awards of common stock, one of 7,853 shares and another of 5,242 shares, as performance-based restricted stock units from grants dated March 15, 2023 and March 15, 2024 met their conditions.
To cover tax obligations on these awards, a total of 4,859 shares of common stock were withheld at a price of $16.93 per share. These F-code transactions reflect tax-withholding dispositions rather than discretionary sales, and the A-code entries represent equity compensation grants.
Great Lakes Dredge & Dock CORP SVP Christopher Gunsten reported compensation-related stock transactions in Great Lakes Dredge & Dock CORP common stock. On March 16, 2026, he received two stock awards totaling 21,090 shares at $0.00 per share after performance conditions were met on prior performance-based restricted stock units granted in March 2023 and March 2024.
On the same date, 10,394 shares were disposed of at $16.93 per share to cover tax liabilities, a non-market tax-withholding mechanism rather than an open-market sale. After these transactions, he directly owned 110,636 shares of common stock.
Great Lakes Dredge & Dock Corp SVP Eleni Beyko reported compensation-related stock transactions, not open‑market trading. On March 16, 2026, she received two performance-based common stock awards of 14,754 and 9,852 shares after meeting performance conditions tied to restricted stock units granted in 2023 and 2024.
To cover tax obligations on these vestings, a total of 12,545 shares of common stock were disposed of at $16.93 per share through tax-withholding transactions, which are not market sales. Following these awards and tax withholdings, she directly holds 133,895 shares of Great Lakes Dredge & Dock common stock.
Great Lakes Dredge & Dock VP & CAO Ryan Bayer reported routine equity compensation activity in company stock. On March 16, 2026, he received a grant of 2,170 shares of common stock at $0.00 per share, representing performance-based restricted stock units that vested after meeting 2024 performance conditions. On the same date, a total of 2,136 shares were disposed of at $16.93 per share to cover tax obligations, not as open-market sales. After these transactions, Bayer directly held 31,773 shares of common stock.
Great Lakes Dredge & Dock Corp executive receives stock award. On February 23, 2026, SVP, CLO, CCO & Corporate Secretary Vivienne Schiffer acquired 19,149 shares of Great Lakes Dredge & Dock common stock through a grant or award at a stated price of $0.00 per share.
These shares are in the form of restricted stock units that vest in three equal annual installments beginning on February 23, 2027, aligning the award with multi-year performance and retention. After this grant, Schiffer directly holds a total of 101,330 shares of the company’s common stock.
Great Lakes Dredge & Dock Corp reported that CEO and President Lasse Petterson acquired 132,825 shares of common stock through a grant of restricted stock units at a stated price of $0.0000 per share on February 23, 2026. These restricted stock units vest in three equal annual installments beginning on February 23, 2027, meaning the shares are earned over time rather than all at once. Following this grant, Petterson's directly held common stock position increased to 1,292,202.29 shares.
Kornblau Scott Lee reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock’s SVP & CFO, Scott Lee Kornblau, reported an award of 26,603 shares of common stock in the form of restricted stock units. These RSUs vest in three equal annual installments beginning on February 23, 2027. Following this grant, his direct holdings total 138,733.24 shares.
Great Lakes Dredge & Dock Corp reported that senior vice president Christopher Gunsten acquired 13,988 shares of common stock on February 23, 2026 through a restricted stock unit award. These units vest in three equal annual installments beginning on February 23, 2027, bringing his directly held shares to 99,940.
JOHANSON DAVID reported acquisition or exercise transactions in this Form 4 filing.
Great Lakes Dredge & Dock senior vice president David Johanson received an equity grant of 13,988 shares of common stock in the form of restricted stock units. These units will vest in three equal annual installments beginning on February 23, 2027, increasing his direct holdings to 105,951.2594 shares after the award.
Great Lakes Dredge & Dock CORP senior vice president granted stock units
SVP of Market Development William H. Hanson acquired 8.743 shares of Great Lakes Dredge & Dock common stock through a grant of restricted stock units at a stated price of $0.00 per share. These units vest in three equal annual installments beginning on February 23, 2027, bringing his directly held total to 68,985.743 shares.
Great Lakes Dredge & Dock CORP reported an equity award to senior vice president Eleni Beyko. She acquired 16,320 shares of common stock through a grant classified as a restricted stock unit award at a stated price of $0.00 per share. These restricted stock units vest in three equal annual installments beginning on February 23, 2027. Following this award, Beyko’s directly held common stock (including the granted units) totals 121,834 shares.
Great Lakes Dredge & Dock Corp VP & CAO Ryan Bayer received an equity award of 7,165 shares of common stock in the form of restricted stock units. The award was granted at no cash cost and is classified as a grant or other acquisition.
The restricted stock units vest in three equal annual installments beginning on February 23, 2027, providing a multi-year incentive. Following this grant, Bayer directly holds 31,739 shares of the company’s common stock.
Great Lakes Dredge & Dock Corp. director Kathleen M. Shanahan reported stock unit conversions into common shares. On January 15, 2026, she exercised 2,849 Deferred Stock Units (DSUs) and separately 3,002 DSUs at an exercise price of $0 per share, receiving the same number of Great Lakes Dredge & Dock common shares for each transaction.
Each DSU represents the right to receive one share of common stock at settlement. After these transactions, she directly held 76,375 shares of common stock, while still holding 11,853 DSUs from a 2024 grant and 8,851 DSUs from a 2025 grant that continue to vest in future installments or earlier if her board service ends.
Great Lakes Dredge & Dock Corp. executive Vivienne R. Schiffer, SVP-Project Acquisition & Ops, reported a sale of company stock. On 12/10/2025 she sold 2,100 shares of common stock at a weighted average price of $13.9564, with individual trades priced between $13.95 and $13.975. After this transaction she directly owns 91,963.2594 shares of Great Lakes Dredge & Dock common stock. The sale was executed under a Rule 10b5-1 trading plan adopted on August 18, 2025, providing for pre-arranged stock transactions.
Ronald Steger, a director of Great Lakes Dredge & Dock Corp. (GLDD), reported transactions dated 09/30/2025. The filing shows a disposition of 20,404 shares of Common Stock and a grant of 2,304 Deferred Stock Units (DSUs) under the company’s Director Deferral Plan. The DSUs are deferred compensation that will be paid in common stock on a 1-for-1 basis when Mr. Steger’s board service ends.
The form is signed by Vivienne R. Schiffer by power of attorney on 10/01/2025. Following the reported transactions the filing indicates 41,337 shares of common stock beneficially owned (direct).
Kathleen M. Shanahan, a director of Great Lakes Dredge & Dock Corp (GLDD), reported transactions dated 09/30/2025. The filing shows a disposition of 70,524 shares of common stock and the grant and deferral of 2,106 Deferred Stock Units (DSUs) under the company’s Director Deferral Plan. The DSUs are payable in common stock on a 1-for-1 basis in three equal annual installments beginning January 15, 2026. Following the reported derivative transaction, the filing shows 12,777 shares beneficially owned by the reporting person in a direct ownership form. The report was signed by power of attorney on 10/01/2025 and lists the reporting person’s affiliation and Houston address as provided.
Lawrence R. Dickerson, a director of Great Lakes Dredge & Dock Corp. (GLDD), reported changes in his beneficial ownership on Form 4. The filing shows a transaction dated 09/30/2025 in which 86,217 shares of common stock were disposed of, leaving Mr. Dickerson with 70,218 shares held directly following the reported transactions. The Form 4 is signed by an attorney-in-fact on behalf of Mr. Dickerson.
The filing also discloses that on 09/30/2025 Mr. Dickerson was granted 4,165 Deferred Stock Units (DSUs) under the company’s Director Deferral Plan. The DSUs are deferred compensation that will be paid in common stock on a 1-for-1 basis when his board service ends and are recorded at a price of $0 in the form. The filing contains no earnings or operational information.