Ero Copper Corp. Common Shares (ERO)
ERO moved a median of -0.02% 30 minutes after news, and +0.24% by the close. How ERO actually reacts to news — the realized, point-in-time move the market made, measured across 169 labeled events over the last three years with zero look-ahead.
ERO’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 50% | 169 |
| 30-min | -0.02% | 50% | 169 |
| 60-min | -0.08% | 49% | 169 |
| to close | +0.24% | 52% | 169 |
| Middle 50% of ERO reactions | -1.05% to +1.24% |
|---|---|
| Median reaction (30-min) | -0.02% |
| Measured reactions | 169 |
Half of all Ero Copper Corp. Common Shares news events land between -1.05% and +1.24% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ERO reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 48 | -0.24% | 46% | -0.37% |
| Analyst downgrades | 45 | -0.47% | 36% | -1.11% |
| Coverage initiations | 16 | -0.45% | 50% | +0.04% |
| Rating reiterations | 22 | -0.52% | 32% | -0.79% |
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. 1 further class was observed with fewer than 10 measured events and is not published. See how ERO ranks against every other measured name →
That’s how ERO usually reacts — get an email when it moves on news →Email me when ERO moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ERO's baseline. Nothing else.
Recent ERO events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Ero Copper to Release Third Quarter 2026 Operating and Financial Results on November 2, 2026 | Press release | GlobeNewswire | +0.66% | +2.82% | |
| Form 6-K Ero Copper Corp. For: Oct 01 | SEC filing · Form 6-K | SEC EDGAR | +0.66% | +2.82% | |
| Form 6-K Ero Copper Corp. For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | -0.38% | +2.19% | |
| Copper Hit a Record High as Chile Posts Its Weakest Output in 19 Years | Press release | Canada Newswire | +0.33% | +0.24% | |
| Ero to Host 2026 Capital Markets Day | Press release | GlobeNewswire | +1.71% | -2.41% | |
| Form 6-K Ero Copper Corp. For: Sep 01 | SEC filing · Form 6-K | SEC EDGAR | +1.71% | -2.41% | |
| Ero Copper Reports Second Quarter 2026 Operating and Financial Results | Press release | GlobeNewswire | +1.81% | +5.42% | |
| Form 6-K Ero Copper Corp. For: Jun 30 | SEC filing · Form 6-K | SEC EDGAR | +1.81% | +5.42% | |
| Ero Copper to Release Second Quarter 2026 Operating and Financial Results on August 5, 2026 | Press release | GlobeNewswire | -0.22% | -1.31% | |
| Form 6-K Ero Copper Corp. For: Jul 02 | SEC filing · Form 6-K | SEC EDGAR | -0.22% | -1.31% | |
| Form 6-K Ero Copper Corp. For: Jun 29 | SEC filing · Form 6-K | SEC EDGAR | -0.79% | +1.02% | |
| Ero Copper Announces Voting Results of Annual General and Special Meeting of Shareholders | Press release | GlobeNewswire | -0.79% | +1.02% | |
| Form SD Ero Copper Corp. | SEC filing · Form SD | SEC EDGAR | -1.11% | +1.08% | |
| Ero Confirms High-Grade Continuity and Extends Known Mineralization at Furnas with Significant New Step-Out Intercepts | Press release | GlobeNewswire | +1.14% | +1.38% | |
| Form 6-K Ero Copper Corp. For: Jun 10 | SEC filing · Form 6-K | SEC EDGAR | +1.14% | +1.38% | |
| Form 6-K Ero Copper Corp. For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | -0.07% | +0.22% | |
| Record Quarters, Zero Relief: Copper's Gap Keeps Growing | Press release | Canada Newswire | +0.25% | +2.59% | |
| Ero Copper Reports First Quarter 2026 Operating and Financial Results | Press release | GlobeNewswire | -1.42% | -0.84% | |
| Form 6-K Ero Copper Corp. For: Mar 31 | SEC filing · Form 6-K | SEC EDGAR | -1.42% | -0.84% | |
| Form 6-K Ero Copper Corp. For: Apr 09 | SEC filing · Form 6-K | SEC EDGAR | +0.03% | -0.84% | |
| Ero Copper to Release First Quarter 2026 Operating and Financial Results on May 4, 2026 | Press release | GlobeNewswire | +2.84% | +6.40% | |
| Form 6-K Ero Copper Corp. For: Apr 01 | SEC filing · Form 6-K | SEC EDGAR | +2.84% | +6.40% | |
| Ero Files Technical Report for the Furnas Copper-Gold Project | Press release | GlobeNewswire | +0.66% | +4.22% | |
| Form 40-F Ero Copper Corp. For: Dec 31 | SEC filing · Form 40-F | SEC EDGAR | +0.66% | +4.22% | |
| Form 6-K Ero Copper Corp. For: Mar 30 | SEC filing · Form 6-K | SEC EDGAR | +0.66% | +4.22% | |
| Form 6-K Ero Copper Corp. For: Mar 27 | SEC filing · Form 6-K | SEC EDGAR | -1.97% | -3.56% | |
| Form 6-K Ero Copper Corp. For: Mar 23 | SEC filing · Form 6-K | SEC EDGAR | -0.33% | +1.23% | |
| Form 6-K Ero Copper Corp. For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | +1.37% | +1.47% | |
| Ero Copper Reports Fourth Quarter and Full Year 2025 Operating and Financial Results | Press release | GlobeNewswire | +0.63% | -2.53% | |
| Form 6-K Ero Copper Corp. For: Dec 31 | SEC filing · Form 6-K | SEC EDGAR | +0.63% | -2.53% | |
| Ero Announces Inaugural PEA for Furnas, Outlines Low Capital Intensity Project with a 24-Year Initial Mine Life | Press release | GlobeNewswire | +4.33% | +7.34% | |
| Form 6-K Ero Copper Corp. For: Feb 23 | SEC filing · Form 6-K | SEC EDGAR | +4.33% | +7.34% | |
| Ero Delivers Record Q4 Production and Strong Year-End Liquidity; Gold Concentrate Sales to Continue Through Mid-2027, Positioning for Next Phase of Step-Change Growth | Press release | GlobeNewswire | -0.39% | -6.68% | |
| Form 6-K Ero Copper Corp. For: Feb 05 | SEC filing · Form 6-K | SEC EDGAR | -0.39% | -6.68% | |
| Ero Copper to Release Fourth Quarter and Full Year 2025 Operating and Financial Results on March 5, 2026 | Press release | GlobeNewswire | +2.70% | +3.61% | |
| Form 6-K Ero Copper Corp. For: Jan 30 | SEC filing · Form 6-K | SEC EDGAR | +2.70% | +3.61% | |
| Form 6-K Ero Copper Corp. For: Dec 19 | SEC filing · Form 6-K | SEC EDGAR | -1.31% | -0.63% | |
| Ero Files Technical Report for the Xavantina Operations | Press release | GlobeNewswire | -1.31% | -0.63% | |
| Ero Announces Result of Year-Long Value-Creation Initiative at Xavantina, Commences First Gold Concentrate Sales in Q4 2025 | Press release | GlobeNewswire | -0.56% | +1.22% | |
| Ero Copper Reports Third Quarter 2025 Operating and Financial Results | Press release | GlobeNewswire | +4.70% | +7.33% | |
| Form 6-K Ero Copper Corp. For: Nov 04 | SEC filing · Form 6-K | SEC EDGAR | -0.56% | +1.22% | |
| Form 6-K Ero Copper Corp. For: Sep 30 | SEC filing · Form 6-K | SEC EDGAR | +4.70% | +7.33% | |
| Form 6-K Ero Copper Corp. For: Oct 10 | SEC filing · Form 6-K | SEC EDGAR | -0.68% | +7.33% | |
| Ero Copper to Release Third Quarter 2025 Operating and Financial Results on November 4, 2025 | Press release | GlobeNewswire | +2.23% | +4.46% | |
| Form 6-K Ero Copper Corp. For: Oct 07 | SEC filing · Form 6-K | SEC EDGAR | +2.23% | +4.46% | |
| Global Copper Demand Projected to Outpace Supply by Over 500,000 Tonnes In 2025, Driving Upward Price Pressure | Press release | Canada Newswire | +0.29% | -0.29% | |
| Ero Copper Intercepts 115 Meters at 0.98% CuEq¹ in Deepest Hole Drilled to Date at Furnas Copper-Gold Project – Phase 2 Drill Program to be Completed in Early Q4 2025 | Press release | GlobeNewswire | +0.12% | +1.76% | |
| Form 6-K Ero Copper Corp. For: Sep 18 | SEC filing · Form 6-K | SEC EDGAR | +0.12% | +1.76% | |
| Form F-10 Ero Copper Corp. | SEC filing · Form F-10 | SEC EDGAR | -1.40% | +3.93% | |
| Form SD Ero Copper Corp. | SEC filing · Form SD | SEC EDGAR | -0.93% | -1.38% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ERO section they belong to.
Where else ERO is measured.
ERO earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Ero Copper Corp. Common Shares's median reaction calculated?
Every labeled ERO 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 169 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. 50% of ERO'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 ERO'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.