Great Lakes Dredge & Dock Corporation
Great Lakes Dredge & Dock Corporation (GLDD) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · GLDD · as of Mar 31, 2025
Ownership Breakdown
194
Institutional Holders
▼ 4 vs Q4
$484.41M
Total Inst. Value
▼ $143.83M vs Q4
66.78M
Shares Outstanding
freeFloat 92.08%
55.67M
13F Shares Held
▲ 2,005 vs Q4
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
GLDD largest shareholders · institutional ownership
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. heavy construction other than bldg const - contractors | 7.16M | 10.63% | 10.63% | $62.33B | May 2, 2025 | ▲ 50.1K |
JENNISON ASSOCIATES LLC heavy construction other than bldg const - contractors | 5.31M | 7.88% | 7.88% | $46.20B | May 5, 2025 | ▲ 981.7K |
DIMENSIONAL FUND ADVISORS LP heavy construction other than bldg const - contractors | 4.34M | 6.44% | 6.44% | $37.74B | May 13, 2025 | ▼ 106.1K |
VANGUARD GROUP INC heavy construction other than bldg const - contractors | 3.91M | 5.80% | 5.80% | $33.99B | May 9, 2025 | ▲ 29.6K |
HARVEY PARTNERS, LLC heavy construction other than bldg const - contractors | 3.73M | 5.54% | 5.54% | $32.48B | May 15, 2025 | ▲ 29.0K |
ALLIANCEBERNSTEIN L.P. heavy construction other than bldg const - contractors | 2.69M | 3.99% | 3.99% | $23.36B | May 15, 2025 | ▼ 180.9K |
TCW GROUP INC heavy construction other than bldg const - contractors | 2.15M | 3.20% | 3.20% | $18.74B | May 7, 2025 | ▲ 82.7K |
AMERICAN CENTURY COMPANIES INC heavy construction other than bldg const - contractors | 1.97M | 2.92% | 2.92% | $17.15B | May 13, 2025 | ▲ 355.2K |
GEODE CAPITAL MANAGEMENT, LLC heavy construction other than bldg const - contractors | 1.61M | 2.38% | 2.38% | $13.97B | May 13, 2025 | ▲ 45.5K |
STATE STREET CORP heavy construction other than bldg const - contractors | 1.57M | 2.33% | 2.33% | $13.66B | May 15, 2025 | ▼ 9.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
21
Increased
+3.25M shares4
New Positions
first time holders24
Decreased
−2.07M shares0
Sold Out
fully exitedNet shares change (top 50)
+1.18M
+3.25M / −2.07M
Net new holders
+1
4 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
GLDD insider trading · insider activity
Source: SEC Form 4
8
Buy transactions
15
Sell transactions
0.53
Buy/Sell ratio
$3M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Schiffer Vivienne SVP, CLO, CCO & Corp Secretary | Apr 1, 2026 | Award | 28,945 | — | — | 144.8K | Form 4 ↗ |
Schiffer Vivienne SVP, CLO, CCO & Corp Secretary | Apr 1, 2026 | U-Tender | 144,817 | — | — | 0 | Form 4 ↗ |
Petterson Lasse CEO & President | Apr 1, 2026 | Award | 206,445 | — | — | 1.57M | Form 4 ↗ |
Petterson Lasse CEO & President | Apr 1, 2026 | U-Tender | 1,568,290.29 | — | — | 0 | Form 4 ↗ |
Kornblau Scott Lee SVP & CFO | Apr 1, 2026 | Award | 90,518 | — | — | 244.1K | Form 4 ↗ |
Kornblau Scott Lee SVP & CFO | Apr 1, 2026 | U-Tender | 244,126.24 | — | — | 0 | Form 4 ↗ |
JOHANSON DAVID SVP-Project Acquisition & Ops | Apr 1, 2026 | Award | 71,860 | — | — | 191.6K | Form 4 ↗ |
JOHANSON DAVID SVP-Project Acquisition & Ops | Mar 25, 2026 | Award | 521.257 | $10.82 | $5.6K | 119.7K | Form 4 ↗ |
JOHANSON DAVID SVP-Project Acquisition & Ops | Apr 1, 2026 | U-Tender | 191,597.516 | — | — | 0 | Form 4 ↗ |
HANSON WILLIAM H SVP, Market Development | Apr 1, 2026 | Award | 13,631 | — | — | 90.9K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Great Lakes Dredge & Dock Corporation (GLDD) is primarily owned by institutional investors, who hold approximately 83.4% of total shares outstanding. Company insiders own approximately 7.92%, while retail and public investors account for the remaining 8.72%.
The largest institutional shareholder of Great Lakes Dredge & Dock Corporation is BLACKROCK, INC., holding approximately 7.16 million shares — equal to 10.63% of outstanding shares — as of March 31, 2025.
A total of 194 institutional investors currently hold GLDD stock, with a combined institutional value of approximately $484,407,815 as of the most recent 13F filing period.
Frequently asked questions
GLDD ownershipGreat Lakes Dredge & Dock Corporation (GLDD) is primarily owned by institutional investors, who hold approximately 83.4% of shares. The largest shareholder is BLACKROCK, INC. with a 10.63% stake. Company insiders hold 7.92%. Data sourced from SEC Form 13F as of March 31, 2025.