Great Lakes Dredge & Dock Corporation
US ˙ NasdaqGS ˙ US3906071093
DETTE SYMBOL ER IKKE LÆNGERE AKTIVT

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionJpmorgan Chase & Co
Latest Disclosed Ownership225,360 shares
Latest Disclosed Value $ 3,824,358
Jpmorgan Chase & Co reports 66.28% decrease in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 13, 2026 - Jpmorgan Chase & Co filed a 13F-HR/A form disclosing ownership of 225,360 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $3,831,120 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 668,280 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of -66.28% during the quarter. The current value of the position is $3,831,120 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 225,360 -442,920 -66.28 3,824 -56.38 0.0000
2026-05-13 2026-03-31 13F GREAT LAKES DREDGE & DOCK C COMMON 390607109 0 -100.00 0
2026-02-11 2025-12-31 13F GREAT LAKES DREDGE & DOCK C COMMON 390607109 668,280 -220,459 -24.81 8,768 -17.72 0.0006
2025-11-26 2025-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 888,739 99,463 12.60 10,656 10.75 0.0006
2025-11-07 2025-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 888,739 99,463 10,656 0.0001
2025-08-12 2025-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 789,276 166,166 26.67 9,621 77.48 0.0006
2025-05-12 2025-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 623,110 -197,287 -24.05 5,421 -41.47 0.0004
2025-02-12 2024-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 820,397 592,276 259.63 9,262 285.60 0.0007
2024-12-26 2024-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 228,121 156,341 217.81 2,402 281.27 0.0002
2024-11-08 2024-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 228,121 156,341 2,402 0.0002
2024-12-26 2024-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 71,780 44,783 165.88 630 166.95 0.0001
2024-08-12 2024-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 71,780 44,783 630 0.0001
2024-12-26 2024-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 26,997 -17,235 -38.97 236 -30.38 0.0000
2024-05-10 2024-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 26,997 -17,235 236 0.0000
2024-12-26 2023-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 44,232 -11,544 -20.70 340 -23.65 0.0000
2024-02-12 2023-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 44,232 -11,544 340 0.0000
2023-11-14 2023-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 55,776 4,543 8.87 445 6.22 0.0000
2023-08-11 2023-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 51,233 -93,798 -64.67 418 -46.89 0.0000
2023-05-18 2023-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 145,031 9,355 6.90 787 0.0001
2023-05-11 2023-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 94,960 -40,716 787 0.0000
2023-02-13 2022-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 135,676 -31,516 -18.85 1 -100.00 0.0001
2022-11-14 2022-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 167,192 -8,901 -5.05 1,268 -45.06 0.0002
2022-08-11 2022-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 176,093 -155,482 -46.89 2,308 -50.39 0.0003
2022-05-11 2022-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 331,575 -16,967 -4.87 4,652 -15.09 0.0006
2022-02-11 2021-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 348,542 -17,053 -4.66 5,479 -0.69 0.0006
2022-02-10 2021-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 348,542 -17,053 5,479 0.0006
2021-11-12 2021-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 365,595 -78,810 -17.73 5,517 -15.03 0.0007
2021-08-12 2021-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 444,405 -58,101 -11.56 6,493 -11.38 0.0008
2021-05-12 2021-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 502,506 -50,391 -9.11 7,327 0.63 0.0010
2021-02-19 2020-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 552,897 -37,282 -6.32 7,281 28.84 0.0011
2021-02-11 2020-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 552,897 -37,282 7,281 180.0643
2020-11-12 2020-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 590,179 -56,199 -8.69 5,651 -5.60 0.0009
2020-11-12 2020-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 590,179 5,651
2020-08-11 2020-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 646,378 -112,254 -14.80 5,986 -4.92 0.0012
2020-05-12 2020-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 758,632 -148,827 -16.40 6,296 -38.76 0.0015
2020-02-11 2019-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 907,459 -677,109 -42.73 10,281 -37.91 0.0019
2019-11-12 2019-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 1,584,568 47,584 3.10 16,558 -0.62 0.0033
2019-08-07 2019-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 1,536,984 1,053,659 218.00 16,661 286.84 0.0033
2019-05-07 2019-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 483,325 468,746 3,215.21 4,307 4,340.21 0.0009
2019-02-11 2018-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 14,579 -12,017 -45.18 97 -41.21 0.0000
2018-11-13 2018-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 26,596 15,005 129.45 165 170.49 0.0000
2018-11-07 2018-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 26,596 15,005 165
2018-08-14 2018-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 11,591 155 1.36 61 15.09 0.0000
2018-05-10 2018-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 11,436 -14,277 -55.52 53 -61.87 0.0000
2018-02-13 2017-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 25,713 15,817 159.83 139 183.67 0.0000
2017-11-09 2017-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 9,896 2,872 40.89 49 63.33 0.0000
2017-08-09 2017-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 7,024 -34,512 -83.09 30 -81.93 0.0000
2017-05-10 2017-03-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 41,536 -113,022 -73.13 166 -74.42 0.0000
2017-02-06 2016-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 154,558 154,558 0.00 649 0.0002
2016-11-04 2016-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 0 -947 -100.00 0 -100.00
2016-08-08 2016-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 947 947 0.00 4 0.0000
2016-02-12 2015-12-31 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 0 -13,784 -100.00 0 -100.00
2015-11-13 2015-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 13,784 13,784 -77.40 70 -84.55 0.0000
2014-02-26 2013-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON 390607109 0 -61,002 -100.00 0 -100.00
2013-10-31 2013-09-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 61,002 21,407 54.06 453 46.13 0.0001
2013-08-13 2013-06-30 13F GREAT LAKES DREDGE & DOCK COMMON 390607109 39,595 39,595 310 0.0001
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.