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

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership20,269 shares
Latest Disclosed Value $ 344,573
Advisor Group Holdings, Inc. reports 6.35% decrease in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 20,269 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $344,573 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 21,643 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of -6.35% during the quarter. The current value of the position is $344,573 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 20,269 -1,374 -6.35 345 21.55 0.0003
2026-02-17 2025-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 21,643 20,322 1,538.38 284 1,786.67 0.0004
2025-11-14 2025-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 1,321 0 0.00 15 0.00 0.0000
2025-09-04 2025-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 1,321 1,269 2,440.38 16 0.0000
2025-08-13 2025-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 2,121 2,069 24 0.0000
2025-05-12 2025-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 52 -2,020 -97.49 0 -100.00 0.0000
2025-06-06 2024-12-31 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 2,072 2,072 23 0.0001
2025-02-07 2024-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 20 20 0 0.0000
2024-11-13 2024-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 0 -20 -100.00 0 0.0000
2024-08-13 2024-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 20 -2,189 -99.09 0 -100.00 0.0000
2024-05-10 2024-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 2,209 -3,249 -59.53 19 -53.66 0.0000
2024-02-12 2023-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 5,458 -18,029 -76.76 42 -78.07 0.0001
2023-11-13 2023-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 23,487 -1,274 -5.15 187 -7.43 0.0003
2023-08-21 2023-06-30 13F/A-1 GREAT LAKES DREDGE & DOCK COM 390607109 24,761 13,846 126.85 202 242.37 0.0004
2023-08-10 2023-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 24,761 13,846 202 0.0001
2023-05-12 2023-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 10,915 240 2.25 59 -6.35 0.0001
2023-02-10 2022-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 10,675 6,247 141.08 63 85.29 0.0001
2022-11-14 2022-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 4,428 1,597 56.41 34 -5.56 0.0001
2022-08-10 2022-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 2,831 -349 -10.97 36 -20.00 0.0001
2022-05-04 2022-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 3,180 0 0.00 45 -10.00 0.0001
2022-02-03 2021-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 3,180 -3,040 -48.87 50 -46.81 0.0001
2021-11-05 2021-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,220 163 2.69 94 5.62 0.0002
2021-08-02 2021-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,057 0 0.00 89 1.14 0.0002
2021-05-13 2021-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 6,057 -4,441 -42.30 88 -36.23 0.0002
2021-02-10 2020-12-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 10,498 35 0.33 138 39.39 0.0004
2020-11-12 2020-09-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 10,463 -666 -5.98 99 -3.88 0.0003
2020-08-14 2020-06-30 13F GREAT LAKES DREDGE & DOCK COM 390607109 11,129 -1,360 -10.89 103 0.00 0.0003
2020-05-18 2020-03-31 13F GREAT LAKES DREDGE & DOCK COM 390607109 12,489 12,489 103 0.0004
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.