Great Lakes Dredge & Dock Corporation (GLDD)
GLDD moved a median of +0.03% 30 minutes after news, and +0.06% by the close. How GLDD actually reacts to news — the realized, point-in-time move the market made, measured across 335 labeled events over the last three years with zero look-ahead.
GLDD’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 48% | 304 |
| 30-min | +0.03% | 54% | 305 |
| 60-min | +0.03% | 55% | 305 |
| to close | +0.06% | 51% | 304 |
| Middle 50% of GLDD reactions | -0.44% to +0.50% |
|---|---|
| Median reaction (30-min) | +0.03% |
| Measured reactions | 335 |
Half of all Great Lakes Dredge & Dock Corporation news events land between -0.44% and +0.50% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How GLDD reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 14 | +0.09% | 57% | +0.12% |
| Analyst downgrades | 24 | 0.00% | 46% | 0.00% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. 3 further classes were observed with fewer than 10 measured events and are not published. See how GLDD ranks against every other measured name →
That’s how GLDD usually reacts — get an email when it moves on news →Email me when GLDD moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to GLDD's baseline. Nothing else.
Recent GLDD events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Great Lakes Dredge & Dock Takes Delivery of Acadia, a State-of-the-Art Subsea Rock Installation Vessel | Press release | GlobeNewswire | — | — | |
| Form 15-12G Great Lakes Dredge & | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form EFFECT Great Lakes Dredge & | SEC filing · Form EFFECT | SEC EDGAR | — | — | |
| Form 8-K Great Lakes Dredge & For: Apr 01 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form POS AM Great Lakes Dredge & | SEC filing · Form POS | SEC EDGAR | — | — | |
| Form S-8 POS Great Lakes Dredge & | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Saltchuk Resources, Inc. and Great Lakes Dredge & Dock Corporation Announce Early Results of Debt Tender Offer and Related Consent Solicitation | Press release | GlobeNewswire | — | — | |
| Saltchuk Welcomes Great Lakes Dredge & Dock to its Family of Companies | Press release | GlobeNewswire | — | — | |
| Form 8-K Great Lakes Dredge & For: Mar 17 | SEC filing · Form 8-K | SEC EDGAR | -0.03% | -0.12% | |
| Are UNF, TALK, GLDD Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | +0.00% | +0.03% | |
| Form 8-K Great Lakes Dredge & For: Mar 18 | SEC filing · Form 8-K | SEC EDGAR | +0.12% | -0.18% | |
| Saltchuk Resources, Inc. and Great Lakes Dredge & Dock Corporation Announce Tender Offer for Any and All 5.25% Senior Notes due 2029 of Great Lakes Dredge & Dock Corporation and Related Consent Solicitation | Press release | GlobeNewswire | +0.12% | -0.18% | |
| Are CWAN, SEM, GLDD Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | — | +0.00% | |
| Form 10-K/A Great Lakes Dredge & For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.09% | +0.18% | |
| Saltchuk Resources, Inc. and Great Lakes Dredge & Dock Corporation Announce Commencement of Tender Offer for All Issued and Outstanding Shares of Great Lakes Dredge & Dock Corporation (NASDAQ:GLDD) | Press release | GlobeNewswire | -0.03% | -0.12% | |
| Form 10-K Great Lakes Dredge & For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | -0.12% | +0.18% | |
| Form 8-K Great Lakes Dredge & For: Feb 23 | SEC filing · Form 8-K | SEC EDGAR | -0.12% | +0.18% | |
| Great Lakes Reports Fourth Quarter and Full Year 2025 Results and the Signing of Two International Offshore Energy Contracts | Press release | GlobeNewswire | -0.12% | +0.18% | |
| Are TPH, GLDD, NFBK Obtaining Fair Deals for their Shareholders? | Press release | PR Newswire | -0.03% | -0.35% | |
| Form 8-K Great Lakes Dredge & For: Feb 12 | SEC filing · Form 8-K | SEC EDGAR | -0.03% | -0.12% | |
| Form 8-K Great Lakes Dredge & For: Feb 10 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | +0.12% | |
| GLDD Alert: Monsey Firm of Wohl & Fruchter Investigating Fairness of the Sale of Great Lakes Dredge & Dock to Saltchuk Resources | Press release | GlobeNewswire | +0.03% | +0.18% | |
| GLDD Stock Alert: Halper Sadeh LLC is Investigating Whether Great Lakes Dredge & Dock Corporation is Obtaining a Fair Price for its Shareholders | Press release | Business Wire | -0.15% | +0.00% | |
| Great Lakes Dredge & Dock to Join the Saltchuk Family of Companies | Press release | GlobeNewswire | +0.09% | +0.12% | |
| Great Lakes Dredge & Dock Corporation Schedules Announcement of 2025 Fourth Quarter and Full Year 2025 Results | Press release | GlobeNewswire | +0.00% | +0.56% | |
| Great Lakes Dredge & Dock to Present at NobleCon21 | Press release | GlobeNewswire | +0.73% | +2.59% | |
| Great Lakes Receives S&P Global Ratings Upgrade to B | Press release | GlobeNewswire | +0.73% | +2.59% | |
| Form 10-Q Great Lakes Dredge & For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -2.62% | -1.18% | |
| Form 8-K Great Lakes Dredge & For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | +0.39% | +8.77% | |
| Great Lakes Reports Third Quarter 2025 Results | Press release | GlobeNewswire | +0.39% | +8.77% | |
| Great Lakes Dredge & Dock Corporation Schedules Announcement of 2025 Third Quarter Results | Press release | GlobeNewswire | +0.18% | +0.09% | |
| Form 8-K Great Lakes Dredge & For: Oct 24 | SEC filing · Form 8-K | SEC EDGAR | +0.18% | +0.09% | |
| Great Lakes Announces Amendment to Upsize and Extend Maturity of Revolving Credit Facility and Repayment of Second Lien Notes | Press release | GlobeNewswire | +0.18% | +0.09% | |
| Great Lakes Announces Receipt of $134 million in Awarded Work | Press release | GlobeNewswire | +0.29% | -1.74% | |
| Great Lakes Dredge & Dock to Present at Sidoti Small Cap Virtual Conference on Thursday September 18, 2025 | Press release | GlobeNewswire | +0.72% | +1.35% | |
| Great Lakes Announces the Delivery of its Newest Hopper Dredge, the Amelia Island | Press release | GlobeNewswire | -0.61% | +0.09% | |
| Form 10-Q Great Lakes Dredge & For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -1.43% | -3.82% | |
| Form 8-K Great Lakes Dredge & For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | +1.09% | +0.26% | |
| Great Lakes Reports Second Quarter 2025 Results | Press release | GlobeNewswire | +1.09% | +0.26% | |
| Great Lakes Dredge & Dock Corporation Schedules Announcement of 2025 Second Quarter Results | Press release | GlobeNewswire | -0.17% | -1.64% | |
| Great Lakes Announces the Launch of the Acadia, the First U.S. Flagged, Jones Act Subsea Rock Installation Vessel | Press release | GlobeNewswire | +0.80% | +1.88% | |
| Great Lakes Announces Receipt of Four Dredging Awards including Woodside Louisiana LNG | Press release | GlobeNewswire | -0.12% | -0.49% | |
| Form 8-K Great Lakes Dredge & For: May 08 | SEC filing · Form 8-K | SEC EDGAR | +0.81% | +2.61% | |
| Form S-8 Great Lakes Dredge & | SEC filing · Form S-8 | SEC EDGAR | -0.28% | +0.09% | |
| Form 10-Q Great Lakes Dredge & For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +1.10% | -0.90% | |
| Form 8-K Great Lakes Dredge & For: May 06 | SEC filing · Form 8-K | SEC EDGAR | +0.14% | -3.57% | |
| Great Lakes Reports First Quarter 2025 Results | Press release | GlobeNewswire | +0.14% | -3.57% | |
| Great Lakes Dredge & Dock Corporation Schedules Announcement of 2025 First Quarter Results | Press release | GlobeNewswire | -0.76% | +0.11% | |
| Form DEF 14A Great Lakes Dredge & For: Mar 26 | SEC filing · Form DEF | SEC EDGAR | -0.45% | +0.56% | |
| Form DEFA14A Great Lakes Dredge & | SEC filing · Form DEFA14A | SEC EDGAR | -0.45% | +0.56% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the GLDD section they belong to.
Where else GLDD is measured.
GLDD earnings → · Analyst actions → · SEC filings →
Other Industrials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| ADVANCED DISPOSAL SERVICES INC (ADSW) | 336 | 0.00% | 47% |
| Blink Charging Co. (BLNK) | 336 | +0.00% | 50% |
| Werner Enterprises, Inc. (WERN) | 334 | -0.02% | 48% |
| Tutor Perini Corporation (TPC) | 333 | +0.33% | 61% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
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Every name we’ve measured, in one place.
How the numbers are made.
How is Great Lakes Dredge & Dock Corporation's median reaction calculated?
Every labeled GLDD news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 335 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 54% of GLDD's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does GLDD's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.