Great Lakes Dredge & Dock Corporation
US ˙ NasdaqGS ˙ US3906071093
TEN SYMBOL NIE JEST JUŻ AKTYWNY

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership329,163 shares
Latest Disclosed Value $ 5,595,781
Morgan Stanley reports 67.72% decrease in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 329,163 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $5,595,771 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,019,618 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of -67.72% during the quarter. The current value of the position is $5,595,771 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 329,163 -690,455 -67.72 5,596 -58.17 0.0003
2026-05-27 2025-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,019,618 222,166 27.86 13,377 39.91 0.0008
2026-02-13 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,019,618 222,166 13,377 0.0008
2026-05-27 2025-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 797,452 4,370 0.55 9,561 -1.10 0.0006
2025-11-14 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 797,452 4,370 9,561 0.0006
2025-08-15 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 793,082 92,518 13.21 9,668 58.63 0.0006
2025-05-15 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 700,564 -111,745 -13.76 6,095 -33.54 0.0004
2025-05-15 2024-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 812,309 170,161 26.50 9,171 35.63 0.0006
2025-02-14 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 812,309 170,161 9,171 0.0006
2025-05-14 2024-09-30 13F/A-2 GREAT LAKES DREDGE & DOCK COM 390607109 642,148 -254,113 -28.35 6,762 -14.08 0.0005
2025-02-14 2024-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 642,148 -254,113 6,762 0.0005
2024-11-14 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 642,148 -254,113 6,762 0.0005
2025-05-14 2024-06-30 13F/A-2 GREAT LAKES DREDGE & DOCK COM 390607109 896,261 445,370 98.78 7,869 99.47 0.0006
2024-10-17 2024-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 896,261 445,370 7,869 0.0006
2024-08-14 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 896,261 445,370 7,869 0.0006
2024-10-17 2024-03-31 13F/A-2 GREAT LAKES DREDGE & DOCK COM 390607109 450,891 -34,584 -7.12 3,945 5.82 0.0003
2024-08-16 2024-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 450,891 -34,584 3,945 0.0000
2024-05-15 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 450,891 -34,584 3,945 0.0003
2024-08-16 2023-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 485,475 36,144 8.04 3,728 4.10 0.0003
2024-02-13 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 485,475 36,144 3,728 0.0003
2023-11-15 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 449,331 40,695 9.96 3,581 7.41 0.0004
2023-08-14 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 408,636 20,381 5.25 3,334 58.16 0.0003
2023-05-15 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 388,255 195,712 101.65 2,108 84.10 0.0002
2023-02-14 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 192,543 -58,975 -23.45 1,146 -39.96 0.0001
2022-11-14 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 251,518 102,275 68.53 1,907 -2.51 0.0003
2022-10-27 2022-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 149,243 28,050 23.14 1,956 15.06 0.0003
2022-08-15 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 149,243 28,050 1,956 0.0001
2022-10-27 2022-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 121,193 -73,387 -37.72 1,700 -44.41 0.0002
2022-05-13 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 121,193 -73,387 1,700 0.0002
2022-02-14 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 194,580 125,906 183.34 3,058 195.17 0.0004
2021-11-15 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 68,674 -126,279 -64.77 1,036 -63.62 0.0001
2021-08-23 2021-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 194,953 49,128 33.69 2,848 34.02 0.0004
2021-08-16 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 194,953 49,128 2,848 0.0001
2021-05-17 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 145,825 63,546 77.23 2,125 96.03 0.0003
2021-02-16 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 82,279 58,524 246.36 1,084 379.65 0.0002
2020-11-13 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 23,755 -17,403 -42.28 226 -40.68 0.0000
2020-08-14 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 41,158 3,771 10.09 381 23.30 0.0001
2020-05-26 2020-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 37,387 -108,441 -74.36 309 -81.30 0.0001
2020-05-15 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 37,387 -108,441 309 23.7376
2020-02-14 2019-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 145,828 95,752 191.21 1,652 216.48 0.0004
2019-11-14 2019-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 50,076 -910,767 -94.79 522 -95.08 0.0001
2019-08-14 2019-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 960,843 -36,786 -3.69 10,607 19.33 0.0028
2019-05-15 2019-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 997,629 668,905 203.49 8,889 308.50 0.0025
2019-02-14 2018-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 328,724 163,964 99.52 2,176 112.92 0.0007
2019-04-23 2018-09-30 13F/A-2 GREAT LAKES DREDGE & DOCK COM 390607109 164,760 -39,515 -19.34 1,022 -4.66 0.0003
2018-11-20 2018-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 164,760 0 1,022 0.0003
2018-11-14 2018-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 164,760 -39,515 1,022
2019-04-23 2018-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 204,275 -153,558 -42.91 1,072 -34.91 0.0003
2018-08-14 2018-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 204,275 -153,558 1,072
2019-04-23 2018-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 357,833 -73,847 -17.11 1,647 -29.34 0.0005
2018-05-14 2018-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 357,833 -73,847 1,647
2019-04-23 2017-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 431,680 -19,309 -4.28 2,331 6.58 0.0006
2018-02-14 2017-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 431,680 -19,309 2,331
2017-11-14 2017-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 450,989 -22,049 -4.66 2,187 7.47 0.0007
2017-08-11 2017-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 473,038 -15,050 -3.08 2,035 4.20 0.0006
2017-05-22 2017-03-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 488,088 -68,476 -12.30 1,953 -16.50 0.0006
2017-05-12 2017-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 488,088 1,953
2017-02-22 2016-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 556,564 172,459 44.90 2,339 74.03 0.0008
2017-02-13 2016-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 556,564 2,339
2016-11-10 2016-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 384,105 -61,166 -13.74 1,344 -30.79 0.0005
2016-08-12 2016-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 445,271 -46,596 -9.47 1,942 -11.45 0.0007
2016-05-12 2016-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 491,867 -7,352 -1.47 2,193 10.93 0.0008
2016-02-09 2015-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 499,219 -28,517 -5.40 1,977 -25.65 0.0007
2016-02-08 2015-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 527,736 -117,023 -18.15 2,659 -30.81 0.0010
2015-11-09 2015-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 527,736 2,659
2015-08-12 2015-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 644,759 106,330 19.75 3,843 18.76 0.0013
2015-05-14 2015-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 538,429 -7,788 -1.43 3,236 -30.80 0.0012
2015-02-13 2014-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 546,217 -304,901 -35.82 4,676 -11.10 0.0017
2014-12-16 2014-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 851,118 119,675 16.36 5,260 -21.23 0.0020
2014-11-14 2014-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 851,118 5,260
2014-05-13 2014-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 731,443 -21,358 -2.84 6,678 -3.57 0.0028
2014-02-13 2013-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 752,801 -207,931 -21.64 6,925 -2.98 0.0029
2013-11-13 2013-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 960,732 -56,187 -5.53 7,138 -10.24 0.0034
2013-08-08 2013-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,016,919 1,016,919 7,952 0.0040
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.