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Great Lakes Dredge & Dock Corporation (GLDD) institutional ownership

Latest close $17.00 Apr 1, 2026
Market cap$1.1B 52-week range SectorIndustrials
Funds holding · Q1 2026
244
reported GLDD position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Net sold $23M
90 buyers · 154 sellers

Great Lakes Dredge & Dock Corporation (GLDD) price and institutional activity

Dates

Q1 2026

$345M bought by 90 investors
Glazer Capital, LLC$47MFil Ltd$43M +88 more
$367M sold by 154 investors
Harvey Partners, LLC-$49MJennison Associates LLC-$44M +152 more
Bought Sold Totals per quarter; hover a bar for the names.

Great Lakes Dredge & Dock Corporation (GLDD) institutional activity · 154

Investor Type Est. change Change Δ Own Date
Harvey Partners, LLC · Reduced −$49M
Change −3.1M Date Q1 2026
Harvey Partners, LLC Reduced· Q1 2026 −$49M −3.1M Q1 2026
Jennison Associates LLC · Reduced −$44M
Change −2.8M Date Q1 2026
Jennison Associates LLC Reduced· Q1 2026 −$44M −2.8M Q1 2026
TCW Group Inc · Exited −$30M
Change −1.9M Δ Own −100.0% Date Q1 2026
TCW Group Inc Exited· Q1 2026 −$30M −1.9M −100.0% Q1 2026
BlackRock · Reduced −$16M
Change −980K Date Q1 2026
BlackRock Reduced· Q1 2026 −$16M −980K Q1 2026
Dimensional · Reduced −$15M
Change −914K Date Q1 2026
Dimensional Reduced· Q1 2026 −$15M −914K Q1 2026
Morgan Stanley · Reduced −$11M
Change −690K Date Q1 2026
Morgan Stanley Reduced· Q1 2026 −$11M −690K Q1 2026
BNP Paribas Financial Markets · Reduced −$9.1M
Change −574K Date Q1 2026
BNP Paribas Financial Markets Reduced· Q1 2026 −$9.1M −574K Q1 2026
Bridgeway Capital Management, LLC · Exited −$8.1M
Change −508K Δ Own −100.0% Date Q1 2026
Bridgeway Capital Management, LLC Exited· Q1 2026 −$8.1M −508K −100.0% Q1 2026
Millennium Management LLC · Reduced −$7.4M
Change −466K Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −$7.4M −466K Q1 2026
Connor, Clark & Lunn Investment Management Ltd. · Exited −$7.2M
Change −454K Δ Own −100.0% Date Q1 2026
Connor, Clark & Lunn Investment Management Ltd. Exited· Q1 2026 −$7.2M −454K −100.0% Q1 2026
JPMorgan Chase & Co · Reduced −$7.1M
Change −443K Date Q1 2026
JPMorgan Chase & Co Reduced· Q1 2026 −$7.1M −443K Q1 2026
Allspring Global Investments Holdings, LLC · Exited −$6.9M
Change −431K Δ Own −100.0% Date Q1 2026
Allspring Global Investments Holdings, LLC Exited· Q1 2026 −$6.9M −431K −100.0% Q1 2026
Castlekeep Investment Advisors LLC · Exited −$6.8M
Change −428K Δ Own −100.0% Date Q1 2026
Castlekeep Investment Advisors LLC Exited· Q1 2026 −$6.8M −428K −100.0% Q1 2026
Two Sigma Advisers, LP · Exited −$6.6M
Change −416K Δ Own −100.0% Date Q1 2026
Two Sigma Advisers, LP Exited· Q1 2026 −$6.6M −416K −100.0% Q1 2026
Centerbook Partners LP · Exited −$6.5M
Change −411K Δ Own −100.0% Date Q1 2026
Centerbook Partners LP Exited· Q1 2026 −$6.5M −411K −100.0% Q1 2026
Data through Q1 2026 · filed Jun 2, 2026
15 of 154

Famous investor activity in Great Lakes Dredge & Dock Corporation (GLDD)

Great Lakes Dredge & Dock Corporation (GLDD) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Schiffer Vivienne · Officer Other Form 4 events -145K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Schiffer Vivienne Officer Other Form 4 events -145K 0 Apr 1, 2026 Apr 1, 2026
Schiffer Vivienne · Officer Grant (A) 29K
Owned 145K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Schiffer Vivienne Officer Grant (A) 29K 145K Apr 1, 2026 Apr 1, 2026
Petterson Lasse · Director Other Form 4 events -1.6M
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Petterson Lasse Director Other Form 4 events -1.6M 0 Apr 1, 2026 Apr 1, 2026
Petterson Lasse · Director Grant (A) 206K
Owned 1.6M Trade date Apr 1, 2026 Filed date Apr 1, 2026
Petterson Lasse Director Grant (A) 206K 1.6M Apr 1, 2026 Apr 1, 2026
Kornblau Scott Lee · Officer Other Form 4 events -244K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Kornblau Scott Lee Officer Other Form 4 events -244K 0 Apr 1, 2026 Apr 1, 2026
Kornblau Scott Lee · Officer Grant (A) 91K
Owned 244K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Kornblau Scott Lee Officer Grant (A) 91K 244K Apr 1, 2026 Apr 1, 2026
Johanson David · Officer Other Form 4 events -192K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Johanson David Officer Other Form 4 events -192K 0 Apr 1, 2026 Apr 1, 2026
Johanson David · Officer Grant (A) 72K
Owned 192K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Johanson David Officer Grant (A) 72K 192K Apr 1, 2026 Apr 1, 2026
Hanson William H. · Officer Other Form 4 events -91K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Hanson William H. Officer Other Form 4 events -91K 0 Apr 1, 2026 Apr 1, 2026
Hanson William H. · Officer Grant (A) 14K
Owned 91K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Hanson William H. Officer Grant (A) 14K 91K Apr 1, 2026 Apr 1, 2026
Gunsten Christopher · Officer Other Form 4 events -182K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Gunsten Christopher Officer Other Form 4 events -182K 0 Apr 1, 2026 Apr 1, 2026
Gunsten Christopher · Officer Grant (A) 72K
Owned 182K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Gunsten Christopher Officer Grant (A) 72K 182K Apr 1, 2026 Apr 1, 2026
Beyko Eleni · Officer Other Form 4 events -151K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Beyko Eleni Officer Other Form 4 events -151K 0 Apr 1, 2026 Apr 1, 2026
Beyko Eleni · Officer Grant (A) 26K
Owned 151K Trade date Apr 1, 2026 Filed date Apr 1, 2026
Beyko Eleni Officer Grant (A) 26K 151K Apr 1, 2026 Apr 1, 2026
Bayer Ryan · Officer Other Form 4 events -37K
Owned 0 Trade date Apr 1, 2026 Filed date Apr 1, 2026
Bayer Ryan Officer Other Form 4 events -37K 0 Apr 1, 2026 Apr 1, 2026
15 of 67
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Great Lakes Dredge & Dock Corporation (GLDD) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
BlackRock Inc. 7.4M
% of shares outstanding 11.1% Filing date Jan 24, 2024
BlackRock Inc. 7.4M 11.1% Jan 24, 2024
Blackrock, Inc. 5.5M
% of shares outstanding 8.2% Filing date Apr 28, 2026
Blackrock, Inc. 5.5M 8.2% Apr 28, 2026
Alliancebernstein L.P. 4.6M
% of shares outstanding 6.9% Filing date Feb 14, 2024
Alliancebernstein L.P. 4.6M 6.9% Feb 14, 2024
Vanguard Group Inc 3.4M
% of shares outstanding 5.0% Filing date Feb 13, 2024
Vanguard Group Inc 3.4M 5.0% Feb 13, 2024
Vanguard Capital Management 3.4M
% of shares outstanding 5.0% Filing date Apr 30, 2026
Vanguard Capital Management 3.4M 5.0% Apr 30, 2026
Ashford Capital Management Inc 3.3M
% of shares outstanding 5.0% Filing date Feb 14, 2022
Ashford Capital Management Inc 3.3M 5.0% Feb 14, 2022
Franklin Mutual Advisers LLC 2.5M
% of shares outstanding 3.8% Filing date Jan 31, 2023
Franklin Mutual Advisers LLC 2.5M 3.8% Jan 31, 2023
Jennison Associates LLC 1.0M
% of shares outstanding 1.5% Filing date May 6, 2026
Jennison Associates LLC 1.0M 1.5% May 6, 2026
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Great Lakes Dredge & Dock Corporation (GLDD) ownership FAQ

Who owns GLDD?

244 reporting institutions disclosed GLDD position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.