五大湖疏浚船塢公司
US ˙ NasdaqGS ˙ US3906071093
該符號不再有效

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionCitigroup Inc
Latest Disclosed Ownership19,347 shares
Latest Disclosed Value $ 328,899
Citigroup Inc reports 59.36% decrease in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 19,347 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $328,899 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 47,600 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of -59.36% during the quarter. The current value of the position is $328,899 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)
2026-05-11 2026-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 19,347 -28,253 -59.36 329 -47.44 0.0001
2026-02-13 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 47,600 28,960 155.36 625 179.82 0.0003
2025-11-10 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 18,640 -50,820 -73.16 223 -73.64 0.0001
2025-08-11 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 69,460 4,420 6.80 847 49.73 0.0004
2025-05-12 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 65,040 -590 -0.90 566 -23.65 0.0003
2025-02-12 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 65,630 5,679 9.47 741 17.27 0.0004
2024-11-12 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 59,951 38,306 176.97 631 232.11 0.0004
2024-08-12 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 21,645 2,920 15.59 190 16.56 0.0001
2024-05-10 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 18,725 2,751 17.22 164 33.61 0.0001
2024-02-09 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 15,974 9,786 158.14 123 148.98 0.0001
2023-12-06 2023-09-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 6,188 -21,289 -77.48 49 -78.12 0.0000
2023-11-09 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,188 -21,289 49 0.0000
2023-08-10 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 27,477 19,055 226.25 224 397.78 0.0001
2023-05-11 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 8,422 1,217 16.89 46 7.14 0.0000
2023-02-09 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 7,205 757 11.74 43 -14.29 0.0000
2022-11-10 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,448 -2,579 -28.57 49 -58.47 0.0000
2022-08-10 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 9,027 1,325 17.20 118 8.26 0.0001
2022-05-12 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 7,702 -12,796 -62.43 109 -66.15 0.0001
2022-02-10 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 20,498 10,861 112.70 322 122.07 0.0002
2021-11-10 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 9,637 5,136 114.11 145 119.70 0.0001
2021-08-10 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 4,501 -603 -11.81 66 -10.81 0.0000
2021-05-13 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 5,104 -8,797 -63.28 74 -59.56 0.0000
2021-02-11 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 13,901 -14,129 -50.41 183 -31.46 0.0001
2020-11-12 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 28,030 -65,964 -70.18 267 -69.31 0.0002
2020-08-12 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 93,994 45,329 93.14 870 115.35 0.0007
2020-05-12 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 48,665 -78,595 -61.76 404 -71.98 0.0004
2020-02-12 2019-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 127,260 35,141 38.15 1,442 49.90 0.0010
2019-11-08 2019-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 92,119 40,973 80.11 962 70.27 0.0008
2019-08-12 2019-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 51,146 36,940 260.03 565 348.41 0.0005
2019-05-13 2019-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 14,206 644 4.75 126 40.00 0.0001
2019-02-12 2018-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 13,562 -2,708 -16.64 90 -10.00 0.0001
2018-11-13 2018-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 16,270 330 2.07 100 19.05 0.0001
2018-08-10 2018-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 15,940 7,185 82.07 84 104.88 0.0001
2018-05-11 2018-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 8,755 -11,306 -56.36 41 -62.39 0.0000
2018-02-12 2017-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 20,061 19,884 11,233.90 109 10,800.00 0.0001
2017-11-13 2017-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 177 35 24.65 1 0.00 0.0000
2017-08-11 2017-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 142 -1,904 -93.06 1 -87.50 0.0000
2017-05-12 2017-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 2,046 -57,779 -96.58 8 -96.81 0.0000
2017-02-10 2016-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 59,825 54,665 1,059.40 251 1,294.44 0.0002
2016-11-10 2016-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 5,160 -1,104 -17.62 18 -33.33 0.0000
2016-08-12 2016-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,264 -44,272 -87.60 27 -88.05 0.0000
2016-05-13 2016-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 50,536 31,611 167.03 226 201.33 0.0003
2016-02-12 2015-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 18,925 18,916 210,177.78 75 0.0001
2015-11-13 2015-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 9 -13,487 -99.93 0 -100.00
2015-08-13 2015-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 13,496 -8,359 -38.25 81 -38.64 0.0001
2015-05-14 2015-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 21,855 -15,296 -41.17 132 -58.49 0.0001
2015-02-17 2014-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 37,151 23,437 170.90 318 274.12 0.0003
2014-11-14 2014-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 13,714 3,117 29.41 85 0.00 0.0001
2014-08-14 2014-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 10,597 -25,852 -70.93 85 -74.47 0.0001
2014-05-15 2014-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 36,449 14,572 66.61 333 65.67 0.0003
2014-02-14 2013-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 21,877 11,900 119.27 201 171.62 0.0002
2013-11-14 2013-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 9,977 -14,092 -58.55 74 -60.64 0.0001
2013-08-14 2013-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 24,069 24,069 188 0.0002
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.