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

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionState Street Corp
Latest Disclosed Ownership1,577,722 shares
Latest Disclosed Value $ 26,821,274
State Street Corp reports 0.73% decrease in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,577,722 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $26,821,274 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,589,380 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of -0.73% during the quarter. The current value of the position is $26,821,274 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)
2026-05-15 2026-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,577,722 -11,658 -0.73 26,821 28.63 0.0009
2026-02-13 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,589,380 -27,973 -1.73 20,853 7.53 0.0007
2025-11-14 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,617,353 -9,385 -0.58 19,392 -2.20 0.0007
2025-08-14 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,626,738 56,336 3.59 19,830 45.14 0.0007
2025-05-15 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,570,402 -9,323 -0.59 13,662 -23.40 0.0006
2025-02-14 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,579,725 39,209 2.55 17,835 9.95 0.0007
2024-11-14 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,540,516 13,010 0.85 16,222 20.95 0.0007
2024-08-14 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,527,506 -1,459 -0.10 13,412 0.25 0.0006
2024-05-15 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,528,965 4,605 0.30 13,378 14.27 0.0006
2024-02-14 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,524,360 98,024 6.87 11,707 2.99 0.0006
2023-11-14 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,426,336 -1,404 -0.10 11,368 -2.43 0.0006
2023-08-14 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,427,740 -784 -0.05 11,650 50.21 0.0006
2023-05-15 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,428,524 59,989 4.38 7,757 -4.74 0.0004
2023-05-15 2022-12-31 13F/A-99 GREAT LAKES DREDGE & DOCK COM 390607109 1,368,535 533 0.04 8,143 -21.48 0.0005
2023-05-15 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,368,535 533 8,143 0.0005
2022-11-15 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,368,002 -12,349 -0.89 10,369 -42.70 0.0007
2022-08-15 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,380,351 47,073 3.53 18,096 -3.26 0.0011
2022-05-16 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,333,278 43,324 3.36 18,706 -7.75 0.0009
2022-02-14 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,289,954 -4,057 -0.31 20,278 3.85 0.0010
2021-11-15 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,294,011 -27,395 -2.07 19,527 1.14 0.0010
2021-08-16 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,321,406 90,437 7.35 19,306 7.57 0.0010
2021-07-09 2021-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,230,969 -52,245 -4.07 17,948 6.20 0.0010
2021-05-17 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,230,969 -52,245 17,948 0.0010
2021-02-16 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,283,214 -20,418 -1.57 16,900 36.31 0.0010
2020-11-10 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,303,632 -21,750 -1.64 12,398 1.02 0.0008
2020-08-14 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,325,382 101,902 8.33 12,273 20.86 0.0009
2020-06-19 2020-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,223,480 -29,353 -2.34 10,155 -28.46 0.0009
2020-05-11 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,223,480 -29,353 10,155 891.8135
2020-02-06 2019-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,252,833 21,205 1.72 14,195 10.29 0.0010
2019-11-14 2019-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,231,628 34,357 2.87 12,871 -2.63 0.0010
2019-08-14 2019-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,197,271 120,273 11.17 13,218 37.74 0.0010
2019-05-15 2019-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,076,998 27,621 2.63 9,596 38.13 0.0007
2019-02-12 2018-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,049,377 -23,237 -2.17 6,947 4.47 0.0006
2018-11-09 2018-09-30 13F GREAT LAKES DREDGE DOCK CP Common equity shares 390607109 1,072,614 24,836 2.37 6,650 20.89 0.0005
2018-08-14 2018-06-30 13F GREAT LAKES DREDGE ; DOCK CP Common equity shares 390607109 1,047,778 -23,304 -2.18 5,501 11.76 0.0005
2018-05-15 2018-03-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,071,082 48,797 4.77 4,922 -10.91 0.0004
2018-02-14 2017-12-31 13F GREAT LAKES DREDGE ; DOCK CP Common equity shares 390607109 1,022,285 -37,513 -3.54 5,525 7.55 0.0004
2017-11-14 2017-09-30 13F GREAT LAKES DREDGE &; DOCK CP Common equity shares 390607109 1,059,798 -3,422 -0.32 5,137 12.24 0.0004
2017-08-14 2017-06-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,063,220 17,953 1.72 4,577 9.52 0.0004
2017-05-15 2017-03-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,045,267 -196,175 -15.80 4,179 -19.80 0.0004
2017-02-09 2016-12-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,241,442 49,798 4.18 5,211 24.93 0.0005
2017-01-13 2016-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,191,644 25,606 2.20 4,171 -17.94 0.0004
2016-11-14 2016-09-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,191,644 4,171
2016-08-12 2016-06-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,166,038 -4,925 -0.42 5,083 -2.59 0.0005
2016-05-20 2016-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,170,963 273,247 30.44 5,218 46.78 0.0006
2016-05-12 2016-03-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 1,170,963 5,218
2016-02-16 2015-12-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 897,716 5,244 0.59 3,555 -21.04 0.0004
2015-11-16 2015-09-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 892,472 -29,913 -3.24 4,502 -18.15 0.0005
2015-08-13 2015-06-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 922,385 -2,993 -0.32 5,500 -1.15 0.0006
2015-05-15 2015-03-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 925,378 -13,227 -1.41 5,564 -30.75 0.0006
2015-02-11 2014-12-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 938,605 -6,553 -0.69 8,035 37.56 0.0008
2014-11-12 2014-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 945,158 -15,233 -1.59 5,841 -23.88 0.0006
2014-11-10 2014-09-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 945,158 5,841
2014-08-12 2014-06-30 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 960,391 -29,877 -3.02 7,673 -15.15 0.0008
2014-05-15 2014-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 990,268 5,033 0.51 9,043 -0.26 0.0010
2014-05-13 2014-03-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 990,268 9,043
2014-02-06 2013-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 985,235 -16,273 -1.62 9,067 22.00 0.0010
2014-02-06 2013-12-31 13F GREAT LAKES DREDGE & DOCK CP Common equity shares 390607109 921,541 8,233
2013-11-12 2013-09-30 13F GREAT LAKES DREDGE & DOCK CP Common Stock 390607109 1,001,508 16,158 1.64 7,432 -3.53 0.0009
2013-08-08 2013-06-30 13F GREAT LAKES DREDGE & DOCK CP Common Stock 390607109 985,350 985,350 7,704 0.0010
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.