Data spanning the past 90 days through December 17, 2025 reveals that Great Lakes Dredge & Dock's three principal insider shareholders consist of SVP Project Acquisition & Ops David Johanson (91.96K shares), Director Kathleen M Shanahan (70.52K shares), Chief Accounting Officer Todd M Lightfoot (66.76K shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Lasse Petterson | CEO & President | 1,159,377 | 12 May, 2025 |
| Ryan Levenson | 333,888 | 19 May, 2023 | |
| David E Simonelli | Chief Operating Officer | 245,866 | 11 May, 2022 |
| Mark W. Marinko | Chief Financial Officer | 223,774 | 16 Mar, 2021 |
| Scott Lee Kornblau | SVP & Cfo | 112,130 | 13 Aug, 2025 |
| David Johanson | SVP Project Acquisition & Ops | 91,963 | 12 Dec, 2025 |
| Eleni Beyko | SVP Offshore Energy | 90,138 | 12 May, 2025 |
| D Michael Steuert | 89,209 | 28 Apr, 2025 | |
| Lawrence R Dickerson | 86,217 | 03 Jan, 2025 | |
| Christopher Gunsten | SVP Proj Svcs & Fleet Engineer | 85,952 | 12 May, 2025 |
| Vivienne Schiffer | SVP And Clo And Cco & Corp Secretary | 82,181 | 12 May, 2025 |
| Kathleen M Shanahan | 70,524 | 16 Jan, 2025 | |
| William H Hanson | SVP And Market Development | 68,977 | 12 May, 2025 |
| Todd M Lightfoot | Chief Accounting Officer | 66,763 | 09 May, 2023 |
| Earl L Shipp | 40,790 | 01 Oct, 2025 | |
| James Tastard | SVP & Chrao | 39,734 | 09 May, 2023 |
| Elaine J Dorward-King | 35,710 | 03 Jul, 2023 | |
| Ryan Bayer | VP & Cao | 24,574 | 12 May, 2025 |
| Ronald Steger | 20,404 | 04 Jun, 2025 | |
| Dana A Armstrong | 6,607 | 01 Oct, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 10 Dec, 2025 | David Johanson | Common Stock | D | 2,100 | $13.96 | 91,963 | D | S |
| 03 Dec, 2025 | David Johanson | Common Stock | D | 10,000 | $13.02 | 94,063 | D | S |
| 30 Sep, 2025 | Dana A Armstrong | - | - | 6,607 | D | |||
| 30 Sep, 2025 | Dana A Armstrong | Common Stock | A | 2,002 | $0.00 | 6,607 | D | A |
| 30 Sep, 2025 | Earl L Shipp | Common Stock | A | 2,002 | $0.00 | 40,790 | D | A |
| 11 Aug, 2025 | Scott Lee Kornblau | - | - | 112,130 | D | |||
| 11 Aug, 2025 | Scott Lee Kornblau | Common Stock | D | 59,805 | $11.48 | 112,130 | D | S |
| 30 Jun, 2025 | Dana A Armstrong | Common Stock | A | 1,969 | $0.00 | 4,605 | D | A |
| 30 Jun, 2025 | Earl L Shipp | Common Stock | A | 1,969 | $0.00 | 38,788 | D | A |
| 03 Jun, 2025 | Ronald Steger | - | - | 20,404 | D | |||
| 03 Jun, 2025 | Ronald Steger | Common Stock | D | 5,000 | $11.58 | 20,404 | D | S |
| 08 May, 2025 | Eleni Beyko | Common Stock | A | 25,000 | - | 75,138 | D | A |
| 08 May, 2025 | William H Hanson | Common Stock | A | 8,237 | - | 68,977 | D | A |
| 08 May, 2025 | Lasse Petterson | Common Stock | A | 125,145 | - | 1,159,377 | D | A |
| 08 May, 2025 | Vivienne Schiffer | Common Stock | A | 18,035 | - | 82,181 | D | A |
| 08 May, 2025 | Christopher Gunsten | Common Stock | A | 13,179 | - | 85,952 | D | A |
| 08 May, 2025 | David Johanson | Common Stock | A | 13,179 | - | 104,063 | D | A |
| 08 May, 2025 | Scott Lee Kornblau | Common Stock | A | 25,058 | - | 171,935 | D | A |
| 08 May, 2025 | Ryan Bayer | Common Stock | A | 10,126 | - | 24,574 | D | A |
| 08 May, 2025 | Eleni Beyko | Common Stock | A | 15,376 | - | 105,514 | D | A |