Arcadium Lithium plc Ordinary Shares (ALTM)
ALTM moved a median of +0.09% 30 minutes after news, and -0.37% by the close. How ALTM actually reacts to news — the realized, point-in-time move the market made, measured across 213 labeled events over the last three years with zero look-ahead.
ALTM’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 45% | 192 |
| 30-min | +0.09% | 51% | 192 |
| 60-min | -0.09% | 43% | 192 |
| to close | -0.37% | 35% | 192 |
| Middle 50% of ALTM reactions | -0.44% to +0.29% |
|---|---|
| Median reaction (30-min) | +0.09% |
| Measured reactions | 213 |
Half of all Arcadium Lithium plc Ordinary Shares news events land between -0.44% and +0.29% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ALTM reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 20 | +0.19% | 80% | +0.18% |
| Coverage initiations | 23 | -0.21% | 39% | +0.29% |
| Rating reiterations | 18 | -0.40% | 44% | -0.11% |
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. 2 further classes were observed with fewer than 10 measured events and are not published. See how ALTM ranks against every other measured name →
That’s how ALTM usually reacts — get an email when it moves on news →Email me when ALTM moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ALTM's baseline. Nothing else.
Recent ALTM events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Arcadium Lithium Announces Effective Date of Make-Whole Fundamental Change for Convertible Senior Notes | Press release | PR Newswire | — | — | |
| Form 8-K Arcadium Lithium plc For: Mar 05 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Rio Tinto completes acquisition of Arcadium Lithium | Press release | Business Wire | — | — | |
| Form 8-K Arcadium Lithium plc For: Feb 28 | SEC filing · Form 8-K | SEC EDGAR | +0.17% | +0.17% | |
| Arcadium Lithium Releases Fourth Quarter and Full Year 2024 Results | Press release | PR Newswire | +0.17% | +0.17% | |
| Form 10-K Arcadium Lithium plc For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.17% | +0.17% | |
| Form 8-K Arcadium Lithium plc For: Feb 27 | SEC filing · Form 8-K | SEC EDGAR | +0.17% | +0.17% | |
| Arcadium Lithium Receives All Required Regulatory Approvals Globally to Close Acquisition by Rio Tinto and Announces Court Hearing Date | Press release | PR Newswire | +0.00% | +0.00% | |
| Form 8-K Arcadium Lithium plc For: Feb 13 | SEC filing · Form 8-K | SEC EDGAR | +0.09% | +0.17% | |
| Arcadium Lithium Announces Date for Fourth Quarter and Full Year 2024 Earnings Release | Press release | PR Newswire | +0.00% | -0.35% | |
| Form 8-K Arcadium Lithium plc For: Feb 05 | SEC filing · Form 8-K | SEC EDGAR | -0.09% | +0.17% | |
| Form 8-K Arcadium Lithium plc For: Jan 23 | SEC filing · Form 8-K | SEC EDGAR | +0.26% | +0.35% | |
| Arcadium Lithium Receives CFIUS Clearance for Proposed Acquisition by Rio Tinto | Press release | PR Newswire | -0.09% | -0.52% | |
| Form 8-K Arcadium Lithium plc For: Jan 01 | SEC filing · Form 8-K | SEC EDGAR | -0.29% | +1.15% | |
| Arcadium Lithium Announces Shareholder Approval of Proposed Rio Tinto Transaction and Provides Regulatory Update | Press release | PR Newswire | -0.67% | +1.35% | |
| Form 8-K Arcadium Lithium plc For: Dec 23 | SEC filing · Form 8-K | SEC EDGAR | -0.67% | +1.35% | |
| Form 8-K Arcadium Lithium plc For: Dec 13 | SEC filing · Form 8-K | SEC EDGAR | +0.29% | -0.39% | |
| Form DEFA14A Arcadium Lithium plc | SEC filing · Form DEFA14A | SEC EDGAR | +0.29% | -0.39% | |
| Form DEFM14A Arcadium Lithium plc | SEC filing · Form DEFM14A | SEC EDGAR | +0.10% | +0.77% | |
| Form 8-K Arcadium Lithium plc For: Nov 15 | SEC filing · Form 8-K | SEC EDGAR | +0.10% | +0.77% | |
| Form 10-Q Arcadium Lithium plc For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.56% | -0.37% | |
| Arcadium Lithium Releases Third Quarter 2024 Results | Press release | PR Newswire | -0.56% | -0.37% | |
| Form 8-K Arcadium Lithium plc For: Nov 07 | SEC filing · Form 8-K | SEC EDGAR | -0.56% | -0.37% | |
| Form PREM14A Arcadium Lithium plc For: Nov 01 | SEC filing · Form PREM14A | SEC EDGAR | +0.56% | +0.37% | |
| Lifshitz Law PLLC Announces Investigations of ALTM, INSI, VIRI, and NAPA | Press release | Accesswire | +0.09% | -0.55% | |
| Arcadium Lithium Announces Date for Third Quarter 2024 Earnings Release | Press release | PR Newswire | +0.09% | -0.36% | |
| ALTM Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of Arcadium Lithium plc Is Fair to Shareholders | Press release | Business Wire | +0.03% | +0.36% | |
| Form 8-K Arcadium Lithium plc For: Oct 09 | SEC filing · Form 8-K | SEC EDGAR | +0.03% | +0.36% | |
| Form DEFA14A Arcadium Lithium plc | SEC filing · Form DEFA14A | SEC EDGAR | +0.03% | +0.36% | |
| Rio Tinto to acquire Arcadium Lithium | Press release | Business Wire | +0.03% | +0.36% | |
| Arcadium Lithium Confirms Approach by Rio Tinto | Press release | PR Newswire | +0.52% | -1.88% | |
| Form SD Arcadium Lithium plc | SEC filing · Form SD | SEC EDGAR | +0.00% | -0.18% | |
| Arcadium Lithium's 2024 Investor Day Highlights Company's Strategic Vision and Pathway to Significant Growth | Press release | PR Newswire | -1.02% | +2.03% | |
| Arcadium Lithium Publishes 2023 Sustainability Report | Press release | PR Newswire | -1.02% | +0.41% | |
| Arcadium Lithium Suspends Stage 4A Waste Stripping at Mt Cattlin and Plans to Transition Site to Care & Maintenance by Mid-2025 | Press release | PR Newswire | +0.61% | -2.05% | |
| Arcadium Lithium to Host Investor Day on September 19, 2024 | Press release | PR Newswire | -0.55% | +5.11% | |
| Form 10-Q Arcadium Lithium plc For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.35% | -1.76% | |
| Arcadium Lithium Releases Second Quarter 2024 Results | Press release | PR Newswire | -3.48% | -6.62% | |
| Form 8-K Arcadium Lithium plc For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | -3.48% | -6.62% | |
| Arcadium Lithium Acquires Li-Metal's Lithium Metal Business to Enhance Production Capabilities and Meet Demand for Next Generation Battery Materials | Press release | PR Newswire | +0.95% | -3.05% | |
| Form 8-K Arcadium Lithium plc For: Jul 25 | SEC filing · Form 8-K | SEC EDGAR | -0.16% | -4.40% | |
| ILiAD Successfully Finalizes Funding Round With SLB Investment | Press release | PR Newswire | -0.43% | -2.00% | |
| Arcadium Lithium Announces Date for Second Quarter 2024 Earnings Release and Webcast Conference Call | Press release | PR Newswire | +0.00% | +1.94% | |
| Form DEF 14A Arcadium Lithium plc For: Jul 25 | SEC filing · Form DEF | SEC EDGAR | +1.20% | -0.48% | |
| Form DEFA14A Arcadium Lithium plc | SEC filing · Form DEFA14A | SEC EDGAR | +1.20% | -0.48% | |
| Arcadium Lithium's CEO Paul Graves to Speak at Multiple Upcoming Conferences in the Second Quarter | Press release | PR Newswire | -0.63% | +1.89% | |
| Arcadium Lithium Makes Application to Cease to be a Reporting Issuer in Canada | Press release | Canada Newswire | -2.62% | -2.52% | |
| Form 10-Q Arcadium Lithium plc For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.32% | -1.27% | |
| Arcadium Lithium Releases First Quarter 2024 Results | Press release | PR Newswire | +0.43% | -0.65% | |
| Form 8-K Arcadium Lithium plc For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +0.43% | -0.65% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ALTM section they belong to.
Where else ALTM is measured.
ALTM earnings → · Analyst actions → · SEC filings →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Arcadium Lithium plc Ordinary Shares's median reaction calculated?
Every labeled ALTM 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 213 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. 51% of ALTM'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 ALTM'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.