Who owns Great Lakes Dredge & Dock (GLDD)
Which tracked institutional funds hold GLDD, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GLDD company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-21). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
68 tracked funds added or opened GLDD while 69 trimmed or exited it between 2025-Q4 and 2026-Q1 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
GLDD’s largest tracked holder by dollar value, BlackRock, Inc., sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes GLDD more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in GLDD divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 183 tracked filers holding GLDD, 100 increased or opened the position and 160 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in GLDD between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 33
- GLAZER CAPITAL, LLC$50M
- VANGUARD CAPITAL MANAGEMENT LLC$49M
- FIL Ltd$45M
- BALYASNY ASSET MANAGEMENT L.P.$28M
- WATER ISLAND CAPITAL LLC$21M
- ODDO BHF ASSET MANAGEMENT SAS$20M
Full exits 42
- VANGUARD GROUP INC$52M
- TCW GROUP INC$25M
- BRIDGEWAY CAPITAL MANAGEMENT, LLC$7M
- Connor, Clark & Lunn Investment Management Ltd.$6M
- Allspring Global Investments Holdings, LLC$6M
- CASTLEKEEP INVESTMENT ADVISORS LLC$6M
Largest adds
- TWO SIGMA INVESTMENTS, LP$26M
- AMERICAN CENTURY COMPANIES INC$17M
- Qube Research & Technologies Ltd$15M
- BlackRock, Inc.$10M
- ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$7M
- GEODE CAPITAL MANAGEMENT, LLC$7M
Largest trims
- Harvey Partners, LLC$38M
- JENNISON ASSOCIATES LLC$32M
- MORGAN STANLEY$8M
- BNP PARIBAS FINANCIAL MARKETS$7M
- JPMORGAN CHASE & CO$5M
- Point72 Asset Management, L.P.$4M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| BlackRock, Inc. trimmed | 5,917,589 | $101M | 9.3% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 3,386,372 | $58M | 5.3% | 2026-Q1 |
| AMERICAN CENTURY COMPANIES INC added | 3,006,419 | $51M | 4.7% | 2026-Q1 |
| GLAZER CAPITAL, LLC new | 2,949,613 | $50M | 4.6% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 2,856,158 | $49M | 4.5% | 2026-Q1 |
| FIL Ltd new | 2,671,231 | $45M | 4.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 1,989,521 | $34M | 3.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 1,678,166 | $29M | 2.6% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. added | 1,626,990 | $28M | 2.6% | 2026-Q1 |
| STATE STREET CORP trimmed | 1,577,722 | $27M | 2.5% | 2026-Q1 |
| Qube Research & Technologies Ltd added | 1,383,585 | $24M | 2.2% | 2026-Q1 |
| WATER ISLAND CAPITAL LLC new | 1,263,580 | $21M | 2.0% | 2026-Q1 |
| ODDO BHF ASSET MANAGEMENT SAS new | 1,166,388 | $20M | 1.8% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 1,131,127 | $19M | 1.8% | 2026-Q1 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP added | 1,054,360 | $18M | 1.7% | 2026-Q1 |
| Minerva Advisors LLC trimmed | 1,029,703 | $18M | 1.6% | 2026-Q1 |
| JENNISON ASSOCIATES LLC trimmed | 1,029,264 | $17M | 1.6% | 2026-Q1 |
| Beryl Capital Management LLC new | 912,537 | $16M | 1.4% | 2026-Q1 |
| Sand Grove Capital Management LLP new | 893,190 | $15M | 1.4% | 2026-Q1 |
| OMERS ADMINISTRATION Corp new | 864,000 | $15M | 1.4% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC added | 858,621 | $15M | 1.4% | 2026-Q1 |
| AQR Arbitrage LLC new | 730,615 | $12M | 1.1% | 2026-Q1 |
| NORTHERN TRUST CORP added | 669,478 | $11M | 1.1% | 2026-Q1 |
| TIG Advisors, LLC new | 642,867 | $11M | 1.0% | 2026-Q1 |
| Harvey Partners, LLC trimmed | 610,000 | $10M | 1.0% | 2026-Q1 |
| LONDON CO OF VIRGINIA | 584,424 | $10M | 0.9% | 2026-Q1 |
| Squarepoint Ops LLC added | 584,315 | $10M | 0.9% | 2026-Q1 |
| Prescott Group Capital Management, L.L.C. | 576,870 | $10M | 0.9% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 558,012 | $9M | 0.9% | 2026-Q1 |
| GABELLI FUNDS LLC new | 505,543 | $9M | 0.8% | 2026-Q1 |
| Cinctive Capital Management LP new | 500,000 | $8M | 0.8% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 462,923 | $8M | 0.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 434,518 | $7M | 0.7% | 2026-Q1 |
| First Trust Capital Management L.P. new | 434,061 | $7M | 0.7% | 2026-Q1 |
| Schonfeld Strategic Advisors LLC added | 433,667 | $7M | 0.7% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 381,700 | $6M | 0.6% | 2026-Q1 |
| MORGAN STANLEY trimmed | 329,163 | $6M | 0.5% | 2026-Q1 |
| Sanctuary Advisors, LLC trimmed | 305,240 | $5M | 0.5% | 2026-Q1 |
| HRT FINANCIAL LP added | 276,423 | $5M | 0.4% | 2026-Q1 |
| LAZARD ASSET MANAGEMENT LLC added | 269,389 | $5M | 0.4% | 2026-Q1 |
| FRANKLIN RESOURCES INC added | 267,116 | $5M | 0.4% | 2026-Q1 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 255,852 | $4M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 253,954 | $4M | 0.4% | 2026-Q1 |
| GABELLI & Co INVESTMENT ADVISERS, INC. new | 253,695 | $4M | 0.4% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 225,360 | $4M | 0.4% | 2026-Q1 |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC new | 208,184 | $4M | 0.3% | 2026-Q1 |
| Polar Asset Management Partners Inc. new | 200,000 | $3M | 0.3% | 2026-Q1 |
| PRUDENTIAL FINANCIAL INC added | 190,030 | $3M | 0.3% | 2026-Q1 |
| WOLVERINE ASSET MANAGEMENT LLC new | 175,708 | $3M | 0.3% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 173,986 | $3M | 0.3% | 2026-Q1 |
| Nuveen, LLC trimmed | 150,195 | $3M | 0.2% | 2026-Q1 |
| Y-Intercept (Hong Kong) Ltd trimmed | 142,229 | $2M | 0.2% | 2026-Q1 |
| Swiss National Bank | 134,200 | $2M | 0.2% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC trimmed | 131,458 | $2M | 0.2% | 2026-Q1 |
| UBS Group AG added | 129,581 | $2M | 0.2% | 2026-Q1 |
| Groupe la Francaise new | 128,598 | $2M | 0.2% | 2026-Q1 |
| OXFORD ASSET MANAGEMENT LLP new | 121,883 | $2M | 0.2% | 2026-Q1 |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 112,529 | $2M | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 101,821 | $2M | 0.2% | 2026-Q1 |
| Versor Investments LP added | 101,631 | $2M | 0.2% | 2026-Q1 |
| CREDIT AGRICOLE S A added | 100,000 | $2M | 0.2% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 92,353 | $2M | 0.1% | 2026-Q1 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 91,090 | $2M | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 87,855 | $1M | 0.1% | 2026-Q1 |
| HB Wealth Management, LLC trimmed | 87,752 | $1M | 0.1% | 2026-Q1 |
| VANGUARD GROUP INC added | 3,987,334 | $52M | 4.8% | 2025-Q4 stale |
| TCW GROUP INC | 1,874,234 | $25M | 2.3% | 2025-Q4 stale |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 508,266 | $7M | 0.6% | 2025-Q4 stale |
| Connor, Clark & Lunn Investment Management Ltd. added | 453,539 | $6M | 0.6% | 2025-Q4 stale |
| Allspring Global Investments Holdings, LLC trimmed | 430,762 | $6M | 0.5% | 2025-Q4 stale |
| CASTLEKEEP INVESTMENT ADVISORS LLC trimmed | 428,358 | $6M | 0.5% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 415,767 | $5M | 0.5% | 2025-Q4 stale |
| CenterBook Partners LP trimmed | 410,971 | $5M | 0.5% | 2025-Q4 stale |
| Acuitas Investments, LLC | 423,234 | $5M | 0.5% | 2025-Q3 stale |
| Simcoe Capital LLC new | 377,684 | $5M | 0.5% | 2025-Q4 stale |
| ALGERT GLOBAL LLC added | 343,302 | $5M | 0.4% | 2025-Q4 stale |
| Empowered Funds, LLC added | 312,266 | $4M | 0.4% | 2025-Q4 stale |
| ESSEX INVESTMENT MANAGEMENT CO LLC trimmed | 301,986 | $4M | 0.4% | 2025-Q4 stale |
| Cubist Systematic Strategies, LLC trimmed | 316,452 | $4M | 0.4% | 2025-Q3 stale |
| PRIVATE MANAGEMENT GROUP INC trimmed | 282,493 | $4M | 0.3% | 2025-Q4 stale |
| Brandywine Global Investment Management, LLC trimmed | 271,720 | $4M | 0.3% | 2025-Q4 stale |
| NWAM LLC new | 217,450 | $3M | 0.3% | 2025-Q4 stale |
| WELLINGTON MANAGEMENT GROUP LLP trimmed | 256,081 | $3M | 0.3% | 2025-Q2 stale |
| SEGALL BRYANT & HAMILL, LLC trimmed | 221,799 | $3M | 0.3% | 2025-Q4 stale |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. trimmed | 212,306 | $3M | 0.3% | 2025-Q4 stale |
| Walleye Capital LLC added | 206,215 | $3M | 0.3% | 2025-Q4 stale |
| JACOBS LEVY EQUITY MANAGEMENT, INC trimmed | 205,321 | $3M | 0.2% | 2025-Q4 stale |
| FIRST TRUST ADVISORS LP added | 219,506 | $3M | 0.2% | 2025-Q2 stale |
| RAYMOND JAMES FINANCIAL INC trimmed | 187,527 | $2M | 0.2% | 2025-Q4 stale |
| WITTENBERG INVESTMENT MANAGEMENT, INC. trimmed | 183,100 | $2M | 0.2% | 2025-Q4 stale |
| Trexquant Investment LP added | 171,645 | $2M | 0.2% | 2025-Q4 stale |
| Jump Financial, LLC added | 154,915 | $2M | 0.2% | 2025-Q4 stale |
| ZACKS INVESTMENT MANAGEMENT added | 152,586 | $2M | 0.2% | 2025-Q4 stale |
| JANE STREET GROUP, LLC added | 150,174 | $2M | 0.2% | 2025-Q4 stale |
| Jackson Creek Investment Advisors LLC trimmed | 143,321 | $2M | 0.2% | 2025-Q4 stale |
| LPL Financial LLC added | 134,022 | $2M | 0.2% | 2025-Q4 stale |
| TUDOR INVESTMENT CORP ET AL trimmed | 132,476 | $2M | 0.2% | 2025-Q4 stale |
| MACKENZIE FINANCIAL CORP trimmed | 120,869 | $2M | 0.1% | 2025-Q4 stale |
| Seven Six Capital Management, LLC trimmed | 111,113 | $1M | 0.1% | 2025-Q4 stale |
| PANAGORA ASSET MANAGEMENT INC added | 110,705 | $1M | 0.1% | 2025-Q4 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.