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

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionTwo Sigma Advisers, Lp
Latest Disclosed Ownership415,767 shares
Latest Disclosed Value $ 5,454,863
Two Sigma Advisers, Lp reports 46.31% increase in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On February 17, 2026 - Two Sigma Advisers, Lp filed a 13F-HR form disclosing ownership of 415,767 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $5,454,863 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 284,167 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of 46.31% during the quarter. The current value of the position is $7,068,039 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)
2026-02-17 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 415,767 131,600 46.31 5,455 60.08 0.0106
2025-11-14 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 284,167 49,700 21.20 3,407 19.21 0.0068
2025-08-14 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 234,467 91,000 63.43 2,858 129.01 0.0059
2025-05-15 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 143,467 17,600 13.98 1,248 -12.17 0.0028
2025-02-14 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 125,867 -33,300 -20.92 1,421 -15.21 0.0033
2024-11-14 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 159,167 -59,400 -27.18 1,676 -12.66 0.0039
2024-08-14 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 218,567 -11,100 -4.83 1,919 -4.48 0.0043
2024-05-15 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 229,667 -58,000 -20.16 2,010 -9.05 0.0047
2024-02-14 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 287,667 50,600 21.34 2,209 16.94 0.0052
2023-11-14 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 237,067 -23,800 -9.12 1,889 -11.23 0.0048
2023-08-14 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 260,867 -40,100 -13.32 2,129 30.23 0.0054
2023-05-15 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 300,967 143,800 91.50 1,634 74.76 0.0042
2023-02-14 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 157,167 47,600 43.44 935 12.52 0.0026
2022-11-14 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 109,567 -43,400 -28.37 831 -58.55 0.0024
2022-08-15 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 152,967 -1,200 -0.78 2,005 -7.30 0.0057
2022-05-16 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 154,167 32,600 26.82 2,163 13.19 0.0057
2022-02-14 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 121,567 61,400 102.05 1,911 110.46 0.0048
2021-11-15 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 60,167 -4,800 -7.39 908 -4.32 0.0024
2021-08-16 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 64,967 -47,800 -42.39 949 -42.27 0.0025
2021-05-17 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 112,767 -48,600 -30.12 1,644 -22.64 0.0045
2021-02-16 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 161,367 -67,800 -29.59 2,125 -2.48 0.0057
2020-11-16 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 229,167 49,000 27.20 2,179 30.64 0.0062
2020-09-15 2020-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 180,167 -4,800 -2.60 1,668 8.66 0.0049
2020-08-14 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 180,167 -4,800 1,668 4,819.9660
2020-05-15 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 184,967 -58,600 -24.06 1,535 -44.38 0.0059
2020-02-14 2019-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 243,567 -51,400 -17.43 2,760 -10.45 0.0064
2019-11-14 2019-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 294,967 -68,300 -18.80 3,082 -23.14 0.0075
2019-08-14 2019-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 363,267 97,000 36.43 4,010 69.06 0.0100
2019-05-15 2019-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 266,267 113,100 73.84 2,372 133.93 0.0060
2019-02-14 2018-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 153,167 43,400 39.54 1,014 48.90 0.0028
2018-11-14 2018-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 109,767 -16,200 -12.86 681 3.03 0.0017
2018-08-14 2018-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 125,967 -4,900 -3.74 661 9.80 0.0018
2018-05-15 2018-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 130,867 -13,900 -9.60 602 -23.02 0.0016
2018-02-14 2017-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 144,767 4,800 3.43 782 15.17 0.0021
2017-11-14 2017-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 139,967 12,600 9.89 679 23.91 0.0019
2017-08-14 2017-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 127,367 -2,400 -1.85 548 5.59 0.0018
2017-05-15 2017-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 129,767 22,800 21.31 519 15.59 0.0017
2017-02-14 2016-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 106,967 69,500 185.50 449 242.75 0.0017
2016-11-14 2016-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 37,467 13,900 58.98 131 27.18 0.0006
2016-08-15 2016-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 23,567 0 0.00 103 -1.90 0.0005
2016-05-16 2016-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 23,567 -1,200 -4.85 105 7.14 0.0006
2016-02-16 2015-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 24,767 3,300 15.37 98 -10.09 0.0006
2015-11-16 2015-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 21,467 -39,101 -64.56 109 -69.81 0.0007
2016-02-09 2015-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COMMON STOCK 390607109 60,568 -11,497 -15.95 361 -16.63 0.0028
2015-08-14 2015-06-30 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 60,568 360
2016-02-09 2015-03-31 13F/A-1 GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 72,065 -11,400 -13.66 433 -39.36 0.0033
2015-05-15 2015-03-31 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 70,567 425
2016-02-09 2014-12-31 13F/A-1 GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 83,465 -30,500 -26.76 714 1.42 0.0057
2015-02-17 2014-12-31 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 83,665 712
2016-02-09 2014-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 113,965 -43,600 -27.67 704 -44.08 0.0055
2014-11-14 2014-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 113,965 705
2016-02-09 2014-06-30 13F/A-1 GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 157,565 2,100 1.35 1,259 -11.28 0.0101
2014-08-14 2014-06-30 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 157,565 1,257
2014-05-15 2014-03-31 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 155,465 43,000 38.23 1,419 37.10 0.0129
2014-02-14 2013-12-31 13F GREAT LAKES DREDGE + DOCK COMMON STOCK 390607109 112,465 112,465 1,035 0.0100
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.