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

SecurityGLDD / Great Lakes Dredge & Dock Corporation
InstitutionQUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series
Latest Disclosed Ownership114,077 shares
Latest Disclosed Value $ 1,390,598
QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series reports 3.92% increase in ownership of GLDD / Great Lakes Dredge & Dock Corporation

On August 26, 2025 - QUANTITATIVE MASTER SERIES LLC - Master Small Cap Index Series filed a NPORT-P form disclosing ownership of 114,077 shares of Great Lakes Dredge & Dock Corporation (US:GLDD) valued at $1,390,599 USD as of June 30, 2025. The entity filed a previous NPORT-P on May 28, 2025 disclosing 109,779 shares of Great Lakes Dredge & Dock Corporation. This represents a change in shares of 3.92% during the quarter. The current value of the position is $1,939,309 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)
2025-08-26 2025-06-30 NP Great Lakes Dredge & Dock EC US3906071093 114,077 4,298 3.92 1,391 45.55 0.0312
2025-05-28 2025-03-31 NP Great Lakes Dredge & Dock EC US3906071093 109,779 -4,029 -3.54 955 -25.62 0.0229
2025-02-25 2024-12-31 NP Great Lakes Dredge & Dock EC US3906071093 113,808 -17,697 -13.46 1,285 -7.23 0.0281
2024-11-26 2024-09-30 NP Great Lakes Dredge & Dock EC US3906071093 131,505 8,338 6.77 1,385 28.03 0.0262
2024-08-26 2024-06-30 NP Great Lakes Dredge & Dock EC US3906071093 123,167 5,683 4.84 1,081 5.26 0.0220
2024-05-28 2024-03-31 NP Great Lakes Dredge & Dock EC US3906071093 117,484 0 0.00 1,028 13.86 0.0215
2024-02-26 2023-12-31 NP Great Lakes Dredge & Dock EC US3906071093 117,484 5,103 4.54 902 0.78 0.0193
2023-11-28 2023-09-30 NP Great Lakes Dredge & Dock EC US3906071093 112,381 0 0.00 896 -2.40 0.0234
2023-08-25 2023-06-30 NP Great Lakes Dredge & Dock EC US3906071093 112,381 9,926 9.69 917 64.93 0.0217
2023-05-26 2023-03-31 NP Great Lakes Dredge & Dock EC US3906071093 102,455 0 0.00 556 -8.70 0.0148
2023-02-24 2022-12-31 NP Great Lakes Dredge & Dock EC US3906071093 102,455 0 0.00 610 -21.52 0.0168
2022-11-25 2022-09-30 NP Great Lakes Dredge & Dock EC US3906071093 102,455 3,101 3.12 777 -40.40 0.0222
2022-08-25 2022-06-30 NP Great Lakes Dredge & Dock EC US3906071093 99,354 0 0.00 1,303 -6.53 0.0360
2022-05-26 2022-03-31 NP Great Lakes Dredge & Dock EC US3906071093 99,354 2,961 3.07 1,394 -8.05 0.0325
2022-02-25 2021-12-31 NP Great Lakes Dredge & Dock EC US3906071093 96,393 0 0.00 1,515 4.20 0.0329
2021-11-24 2021-09-30 NP Great Lakes Dredge & Dock EC US3906071093 96,393 0 0.00 1,455 3.27 0.0320
2021-08-26 2021-06-30 NP Great Lakes Dredge & Dock EC US3906071093 96,393 0 0.00 1,408 0.21 0.0302
2021-05-27 2021-03-31 NP Great Lakes Dredge & Dock EC US3906071093 96,393 682 0.71 1,405 11.51 0.0319
2021-02-25 2020-12-31 NP Great Lakes Dredge & Dock EC US3906071093 95,711 -12,824 -11.82 1,261 22.09 0.0323
2020-11-25 2020-09-30 NP Great Lakes Dredge & Dock EC US3906071093 108,535 0 0.00 1,032 2.69 0.0331
2020-08-27 2020-06-30 NP Great Lakes Dredge & Dock EC US3906071093 108,535 9,982 10.13 1,005 23.01 0.0329
2020-06-01 2020-03-31 NP Great Lakes Dredge & Dock EC US3906071093 98,553 4,442 4.72 818 -23.36 0.0334
2020-02-27 2019-12-31 NP Great Lakes Dredge & Dock EC 390607109 94,111 2,012 2.18 1,066 10.81 0.0321
2019-11-27 2019-09-30 NP Great Lakes Dredge & Dock EC US3906071093 92,099 92,099 962 0.0318
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.