Montrose Environmental Group, Inc. (MEG)
MEG moved a median of -0.36% 30 minutes after news, and -0.78% by the close. How MEG actually reacts to news — the realized, point-in-time move the market made, measured across 234 labeled events over the last three years with zero look-ahead.
MEG’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 35% | 220 |
| 30-min | -0.36% | 40% | 220 |
| 60-min | -0.27% | 46% | 220 |
| to close | -0.78% | 40% | 218 |
| Middle 50% of MEG reactions | -1.26% to +0.78% |
|---|---|
| Median reaction (30-min) | -0.36% |
| Measured reactions | 234 |
Half of all Montrose Environmental Group, Inc. news events land between -1.26% and +0.78% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How MEG reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Coverage initiations | 10 | -0.61% | 40% | -3.51% |
| Rating reiterations | 39 | -0.72% | 46% | -0.07% |
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. 4 further classes were observed with fewer than 10 measured events and are not published. See how MEG ranks against every other measured name →
That’s how MEG usually reacts — get an email when it moves on news →Email me when MEG moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to MEG's baseline. Nothing else.
Recent MEG events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form CERT Onterris, Inc. | SEC filing · Form CERT | SEC EDGAR | — | — | |
| Form 10-Q Onterris, Inc. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-A12B Onterris, Inc. | SEC filing · Form 8-A12B | SEC EDGAR | — | — | |
| Form 8-K Onterris, Inc. For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 8-K Onterris, Inc. For: May 06 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form 10-Q Onterris, Inc. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | — | — | |
| Form 8-K Onterris, Inc. For: May 06 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Onterris Earns 2026 E+E Leader Award for Innovation in Sustainability | Press release | Business Wire | +0.00% | -2.07% | |
| Onterris Announces Timing of First Quarter 2026 Results | Press release | Business Wire | +0.00% | -1.70% | |
| Form 8-K Montrose Environmental For: Apr 17 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +0.58% | |
| Montrose Environmental Group Is Now Onterris | Press release | Business Wire | +0.00% | +0.58% | |
| Form ARS Montrose Environmental For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.00% | -0.87% | |
| Form DEF 14A Montrose Environmental For: May 06 | SEC filing · Form DEF | SEC EDGAR | +0.00% | -0.87% | |
| Form DEFA14A Montrose Environmental | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | -0.87% | |
| Form 10-K Montrose Environmental For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.04% | +2.02% | |
| Form S-8 Montrose Environmental | SEC filing · Form S-8 | SEC EDGAR | +0.04% | +2.02% | |
| Form 8-K Montrose Environmental For: Feb 25 | SEC filing · Form 8-K | SEC EDGAR | +2.56% | +12.94% | |
| Montrose Environmental Group Reports Record Revenue, Earnings and Cash Flow in 2025; Increases 2026 Guidance | Press release | Business Wire | +2.56% | +12.94% | |
| Montrose Environmental Group Announces Timing of Fourth Quarter and Full Year 2025 Results | Press release | Business Wire | -0.54% | +3.64% | |
| Form 8-K Montrose Environmental For: Jan 19 | SEC filing · Form 8-K | SEC EDGAR | -0.87% | -1.26% | |
| Montrose Environmental Group Appoints James Laws as Chief Operating Officer | Press release | Business Wire | -0.87% | -1.26% | |
| Montrose Environmental Group to Attend the 28th Annual Needham Growth Conference | Press release | Business Wire | +0.50% | +1.46% | |
| Montrose Environmental Group Pioneers Methane Emissions Measurement Breakthrough with Patent-Pending VeriPlume Capture System™, Expanding R&D Innovation Portfolio | Press release | Business Wire | +0.00% | -2.25% | |
| While Global Methane Goals Stall, Montrose Environmental Group Helps Clients Significantly Cut Emissions | Press release | Business Wire | +0.00% | +0.04% | |
| Reviving America’s Overlooked Spaces: Montrose Environmental Group Helps Communities Access Over $45 Million in Federal Grants | Press release | Business Wire | +0.00% | -0.51% | |
| Kent County, MI Takes Action on Forever Chemicals with Landmark PFAS Treatment Project with Montrose Environmental Group | Press release | Business Wire | +0.76% | +3.43% | |
| Form 10-Q Montrose Environmental For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.12% | -2.70% | |
| Form 8-K Montrose Environmental For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | -0.44% | -4.24% | |
| Montrose Environmental Group Reports Another Record Quarter and Record First Nine Months; Increases 2025 Guidance | Press release | Business Wire | -0.44% | -4.24% | |
| Montrose Environmental Group and Savannah River Site Renew Partnership to Advance Superfund Cleanup | Press release | Business Wire | -0.85% | -1.48% | |
| Montrose Environmental Group Announces Timing of Third Quarter 2025 Results | Press release | Business Wire | -1.13% | +4.58% | |
| Montrose Environmental Group Leads Industry Readiness with Over 30 Projects Ahead of Impending HON MACT Rule | Press release | Business Wire | -0.19% | -2.76% | |
| Montrose Environmental Group to Attend the Jefferies Industrials Conference | Press release | Business Wire | -0.05% | +2.67% | |
| Montrose Environmental Group Secures 5-Year Partnership with Global Energy Leader to Restore Land, Water and Wildlife Across Western Canada | Press release | Business Wire | -0.75% | +0.43% | |
| Form 10-Q Montrose Environmental For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.81% | +6.18% | |
| Form 8-K Montrose Environmental For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | -2.60% | -17.80% | |
| Montrose Environmental Group Reports Another Record Quarter, First Half 2025 Results, and Increases Guidance | Press release | Business Wire | -2.60% | -17.80% | |
| Montrose Environmental Group to Attend Needham 14th Annual Virtual Industrial Tech, Robotics & Clean Tech 1x1 Conference | Press release | Business Wire | -0.92% | +6.72% | |
| Montrose Environmental Group Announces Timing of Second Quarter 2025 Results | Press release | Business Wire | +0.26% | +2.13% | |
| Breathing New Life Into Forgotten Places: Montrose Environmental Group Helps Communities Unlock Millions in EPA Funding | Press release | Business Wire | -0.36% | +4.99% | |
| Form 8-K Montrose Environmental For: Jul 01 | SEC filing · Form 8-K | SEC EDGAR | -0.93% | +0.68% | |
| Montrose Environmental Group Fully Redeems Series A-2 Preferred Stock | Press release | Business Wire | -0.93% | +0.68% | |
| Montrose Environmental Group Releases 2024 Sustainability Report Highlighting Climate Commitments, Innovation and Client Impact | Press release | PR Newswire | +0.00% | +2.21% | |
| Montrose Environmental Group to Attend William Blair 45th Annual Growth Stock Conference | Press release | PR Newswire | +0.82% | +4.01% | |
| Form 8-K Montrose Environmental For: May 06 | SEC filing · Form 8-K | SEC EDGAR | -0.64% | +2.71% | |
| Form 10-Q Montrose Environmental For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +2.23% | -2.28% | |
| Form 8-K Montrose Environmental For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +7.69% | -9.23% | |
| Montrose Environmental Group Reports Record First Quarter Results, Increases 2025 Guidance, and Announces Inaugural Stock Repurchase Program | Press release | PR Newswire | +7.69% | -9.23% | |
| Montrose Environmental Group Protects Local Communities by Removing Forever Chemicals from Landfills and Local Sites | Press release | PR Newswire | +1.34% | -0.85% | |
| Montrose Environmental Group Awarded $4M AUD Environmental Services Contract for Major Mining Operation in Australia | Press release | PR Newswire | -1.28% | +2.16% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the MEG section they belong to.
Where else MEG is measured.
MEG earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Montrose Environmental Group, Inc.'s median reaction calculated?
Every labeled MEG 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 234 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. 40% of MEG'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 MEG'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.