Arch Resources, Inc. Class A (ARCH)
ARCH moved a median of -0.07% 30 minutes after news, and +0.01% by the close. How ARCH actually reacts to news — the realized, point-in-time move the market made, measured across 228 labeled events over the last three years with zero look-ahead.
ARCH’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 43% | 202 |
| 30-min | -0.07% | 46% | 202 |
| 60-min | -0.01% | 50% | 202 |
| to close | +0.01% | 51% | 203 |
| Middle 50% of ARCH reactions | -0.76% to +0.43% |
|---|---|
| Median reaction (30-min) | -0.07% |
| Measured reactions | 228 |
Half of all Arch Resources, Inc. Class A news events land between -0.76% and +0.43% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ARCH reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 11 | +0.10% | 55% | -0.09% |
| Coverage initiations | 19 | +0.28% | 53% | +0.61% |
| Rating reiterations | 22 | +0.13% | 55% | +0.37% |
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 ARCH ranks against every other measured name →
That’s how ARCH usually reacts — get an email when it moves on news →Email me when ARCH moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ARCH's baseline. Nothing else.
Recent ARCH events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K ARCH RESOURCES, INC. For: Jan 13 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form S-8 POS ARCH RESOURCES, INC. | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Form 8-K ARCH RESOURCES, INC. For: Jan 09 | SEC filing · Form 8-K | SEC EDGAR | -1.13% | -5.03% | |
| Form 8-K ARCH RESOURCES, INC. For: Jan 03 | SEC filing · Form 8-K | SEC EDGAR | -0.36% | -0.22% | |
| Form DEFM14A ARCH RESOURCES, INC. | SEC filing · Form DEFM14A | SEC EDGAR | +0.00% | -0.68% | |
| Arch Resources Reports Third Quarter 2024 Results | Press release | PR Newswire | +3.88% | +7.89% | |
| Form 10-Q ARCH RESOURCES, INC. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.52% | +0.10% | |
| Form 8-K ARCH RESOURCES, INC. For: Nov 05 | SEC filing · Form 8-K | SEC EDGAR | +3.88% | +7.89% | |
| Arch Resources to Announce Third Quarter 2024 Results on November 5 | Press release | PR Newswire | +0.61% | -0.17% | |
| Form 8-K ARCH RESOURCES, INC. For: Oct 14 | SEC filing · Form 8-K | SEC EDGAR | +0.67% | -0.04% | |
| Form SD ARCH RESOURCES, INC. | SEC filing · Form SD | SEC EDGAR | -0.20% | +0.75% | |
| ALERT: Rowley Law PLLC is Investigating Proposed Acquisition of Arch Resources, Inc. | Press release | PR Newswire | -0.17% | -2.43% | |
| ALERT: Rowley Law PLLC is Investigating Proposed Acquisition of Arch Resources, Inc. | Press release | GlobeNewswire | -0.18% | -1.93% | |
| ARCH Merger Investigation: Halper Sadeh LLC Is Investigating Whether the Sale of Arch Resources, Inc. Is Fair to Shareholders | Press release | Business Wire | +0.40% | -7.06% | |
| Arch Resources and CONSOL Energy to Combine in All-Stock Merger of Equals to Create Core Natural Resources, a Premier North American Natural Resource Company Focused on Global Markets | Press release | PR Newswire | -1.29% | -8.10% | |
| Form 8-K ARCH RESOURCES, INC. For: Aug 20 | SEC filing · Form 8-K | SEC EDGAR | -1.29% | -8.10% | |
| Arch Resources Reports Second Quarter 2024 Results | Press release | PR Newswire | -2.43% | -2.86% | |
| Form 10-Q ARCH RESOURCES, INC. For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.06% | +0.24% | |
| Form 8-K ARCH RESOURCES, INC. For: Jul 25 | SEC filing · Form 8-K | SEC EDGAR | -2.43% | -2.86% | |
| Arch Resources to Announce Second Quarter 2024 Results on July 25 | Press release | PR Newswire | -0.29% | +0.07% | |
| Form 8-K ARCH RESOURCES, INC. For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -0.31% | -0.23% | |
| Arch Resources Reports First Quarter 2024 Results | Press release | PR Newswire | -0.75% | +1.58% | |
| Form 10-Q ARCH RESOURCES, INC. For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.47% | -0.19% | |
| Form 8-K ARCH RESOURCES, INC. For: Apr 25 | SEC filing · Form 8-K | SEC EDGAR | -0.75% | +1.58% | |
| Arch Resources to Announce First Quarter 2024 Results on April 25 | Press release | PR Newswire | -0.02% | -2.10% | |
| Form DEF 14A ARCH RESOURCES, INC. For: May 07 | SEC filing · Form DEF | SEC EDGAR | -0.06% | +1.86% | |
| Form DEFA14A ARCH RESOURCES, INC. | SEC filing · Form DEFA14A | SEC EDGAR | -0.06% | +1.86% | |
| Form 8-K ARCH RESOURCES, INC. For: Mar 19 | SEC filing · Form 8-K | SEC EDGAR | -0.62% | +2.45% | |
| Industry Veteran George J. Schuller Jr. Joins Arch Resources as Senior Vice President and Chief Operating Officer | Press release | PR Newswire | -0.62% | +2.45% | |
| Arch Resources Announces Retirement of 315,721 Shares via the Termination and Unwinding of Capped Call Transactions | Press release | PR Newswire | +0.77% | +1.84% | |
| Form 8-K ARCH RESOURCES, INC. For: Mar 06 | SEC filing · Form 8-K | SEC EDGAR | +0.77% | +1.84% | |
| Form 8-K ARCH RESOURCES, INC. For: Feb 26 | SEC filing · Form 8-K | SEC EDGAR | +0.45% | +1.09% | |
| Arch Resources Updates Executive Succession Plan | Press release | PR Newswire | +0.04% | +4.68% | |
| Form 8-K ARCH RESOURCES, INC. For: Feb 21 | SEC filing · Form 8-K | SEC EDGAR | +0.04% | +4.68% | |
| Form 8-K ARCH RESOURCES, INC. For: Feb 16 | SEC filing · Form 8-K | SEC EDGAR | -1.71% | -0.90% | |
| Arch Resources Reports Fourth Quarter 2023 Results | Press release | PR Newswire | -0.87% | +1.76% | |
| Form 10-K ARCH RESOURCES, INC. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.68% | +0.40% | |
| Form 8-K ARCH RESOURCES, INC. For: Feb 15 | SEC filing · Form 8-K | SEC EDGAR | -0.87% | +1.76% | |
| Arch Resources to Announce Fourth Quarter and Full Year 2023 Results on February 15 | Press release | PR Newswire | +0.61% | -0.32% | |
| Leer Mine Becomes First to Achieve Verification for All Protocols Under the New Towards Sustainable Mining Initiative Subscription Program | Press release | PR Newswire | +0.53% | +3.03% | |
| Arch Resources Reports Third Quarter 2023 Results | Press release | PR Newswire | -0.64% | -0.69% | |
| Form 10-Q ARCH RESOURCES, INC. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.06% | -0.55% | |
| Form 8-K ARCH RESOURCES, INC. For: Oct 26 | SEC filing · Form 8-K | SEC EDGAR | -0.64% | -0.69% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ARCH section they belong to.
Where else ARCH is measured.
ARCH earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| New Gold Inc. (NGD) | 232 | +0.10% | 50% |
| GOLDEN QUEEN MINING (GQMNF) | 230 | 0.00% | 36% |
| Iamgold Corporation Ordinary Shares (IAG) | 228 | +0.04% | 52% |
| Denison Mines Corp Ordinary Shares (Canada) (DNN) | 227 | +0.30% | 54% |
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.
All Basic Materials names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Arch Resources, Inc. Class A's median reaction calculated?
Every labeled ARCH 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 228 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. 46% of ARCH'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 ARCH'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.