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

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionNorthern Trust Corp
Latest Disclosed Ownership669,478 shares
Latest Disclosed Value $ 11,381,126
Northern Trust Corp reports 5.10% increase in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 669,478 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $11,381,126 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 636,980 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of 5.10% during the quarter. The current value of the position is $11,381,126 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)
2026-05-14 2026-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 669,478 32,498 5.10 11,381 36.19 0.0003
2026-02-17 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 636,980 -58,177 -8.37 8,357 0.28 0.0002
2025-11-14 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 695,157 4,116 0.60 8,335 -1.06 0.0011
2025-08-13 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 691,041 59,040 9.34 8,424 53.20 0.0012
2025-05-13 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 632,001 -32,090 -4.83 5,498 -26.66 0.0008
2025-02-14 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 664,091 52,644 8.61 7,498 16.45 0.0011
2024-11-13 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 611,447 27,948 4.79 6,439 25.67 0.0011
2024-08-14 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 583,499 -19,086 -3.17 5,123 -2.83 0.0009
2024-05-14 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 602,585 -16,001 -2.59 5,273 10.99 0.0009
2024-02-13 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 618,586 -18 -0.00 4,751 -3.65 0.0009
2023-11-13 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 618,604 14,121 2.34 4,930 -0.04 0.0010
2023-08-11 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 604,483 10,981 1.85 4,933 53.07 0.0009
2023-05-15 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 593,502 -13,475 -2.22 3,223 -10.77 0.0006
2023-02-13 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 606,977 -11,950 -1.93 3,612 -23.02 0.0008
2022-11-14 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 618,927 -1,095 -0.18 4,691 -42.29 0.0011
2022-08-12 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 620,022 -3,448 -0.55 8,128 -7.09 0.0017
2022-05-13 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 623,470 -28,290 -4.34 8,748 -14.63 0.0015
2022-02-08 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 651,760 -15,373 -2.30 10,247 1.79 0.0017
2021-11-15 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 667,133 -637 -0.10 10,067 3.19 0.0018
2021-08-13 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 667,770 -7,978 -1.18 9,756 -0.98 0.0017
2021-05-12 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 675,748 -43,105 -6.00 9,853 4.08 0.0018
2021-02-11 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 718,853 -35,230 -4.67 9,467 32.00 0.0018
2020-11-16 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 754,083 -29,995 -3.83 7,172 -1.23 0.0016
2020-08-14 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 784,078 4,175 0.54 7,261 12.17 0.0017
2020-05-14 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 779,903 7,292 0.94 6,473 -26.06 0.0019
2020-02-14 2019-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 772,611 -15,722 -1.99 8,754 6.26 0.0020
2019-11-13 2019-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 788,333 62,245 8.57 8,238 2.78 0.0020
2019-08-13 2019-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 726,088 20,659 2.93 8,015 27.53 0.0019
2019-05-13 2019-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 705,429 4,646 0.66 6,285 35.45 0.0016
2019-02-12 2018-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 700,783 -6,532 -0.92 4,640 5.79 0.0013
2018-11-14 2018-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 707,315 25,285 3.71 4,386 22.51 0.0011
2018-09-18 2018-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 682,030 880 0.13 3,580 14.27 0.0009
2018-08-14 2018-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 685,826 4,676 3,600
2018-05-09 2018-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 681,150 11,074 1.65 3,133 -13.41 0.0008
2018-02-14 2017-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 670,076 -67,445 -9.14 3,618 1.17 0.0009
2017-11-13 2017-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 737,521 1,765 0.24 3,576 13.02 0.0009
2017-08-11 2017-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 735,756 2,469 0.34 3,164 7.88 0.0009
2017-05-12 2017-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 733,287 14,060 1.95 2,933 -2.91 0.0008
2017-02-13 2016-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 719,227 -666,964 -48.11 3,021 -37.74 0.0009
2016-11-09 2016-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,386,191 -81,631 -5.56 4,852 -24.19 0.0015
2016-08-12 2016-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,467,822 6,105 0.42 6,400 -4.73 0.0021
2016-08-19 2016-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,461,717 41,582 2.93 6,718 19.47 0.0022
2016-05-13 2016-03-31 13F Great Lakes Dredge COMM 390607109 1,461,717 6,518
2016-02-12 2015-12-31 13F Great Lakes Dredge COMM 390607109 1,420,135 -46,213 -3.15 5,623 -23.91 0.0019
2015-11-12 2015-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,466,348 365,541 33.21 7,390 12.65 0.0025
2015-08-13 2015-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,100,807 -418,591 -27.55 6,560 -28.16 0.0044
2015-05-14 2015-03-31 13F Great Lakes Dredge COMM 390607109 1,519,398 110,025 7.81 9,132 -24.30 0.0027
2015-02-12 2014-12-31 13F Great Lakes Dredge COM 390607109 1,409,373 71,687 5.36 12,064 45.93 0.0036
2014-11-13 2014-09-30 13F Great Lakes Dredge COMM 390607109 1,337,686 175,728 15.12 8,267 -10.94 0.0026
2014-08-14 2014-06-30 13F GREAT LAKES DREDGE & DOCK com 390607109 1,161,958 -202,956 -14.87 9,283 -25.51 0.0029
2014-05-14 2014-03-31 13F GREAT LAKES DREDGE & DOCK COMM 390607109 1,364,914 103,866 8.24 12,462 7.42 0.0039
2014-02-21 2013-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,261,048 37,099 3.03 11,601 27.57 0.0037
2014-02-12 2013-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,261,048 11,601
2013-11-13 2013-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,223,949 -17,278 -1.39 9,094 -6.32 0.0032
2013-08-09 2013-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,241,227 1,241,227 9,707 0.0035
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.