Axcelis Technologies, Inc. (ACLS)
How ACLS actually reacts to news — the realized, point-in-time move the market made, measured across 375 labeled events over the last three years with zero look-ahead.
ACLS’s median reaction, across the day.
Half of all Axcelis Technologies, Inc. news events land between -0.95% and +0.85% at 30 minutes.
Reaction stats as of 2026-08-13. Reaction = percent move vs. the price at the news timestamp.
Email me when ACLS moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ACLS’s baseline. Nothing else.
Get “How ACLS reacts to news” as a PDF.
A free one-page summary: ACLS’s median reaction to news and the full breakdown by event type — the numbers on this page, in one page.
Recent ACLS events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Axcelis Announces Financial Results for Second Quarter 2026 | Press release | PR Newswire | -3.44% | -0.03% | |
| Form 10-Q AXCELIS TECHNOLOGIES For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | +2.96% | +2.64% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Aug 06 | SEC filing · Form 8-K | SEC EDGAR | -3.44% | -0.03% | |
| Axcelis Announces Participation in Upcoming Investor Conferences in August | Press release | PR Newswire | +0.34% | -6.06% | |
| Axcelis Announces Successful Purion XEmax Eval Closure at Leading Semiconductor Foundry | Press release | PR Newswire | -3.71% | -1.62% | |
| Axcelis Announces Timing and Availability of Second Quarter 2026 Results and Conference Call | Press release | PR Newswire | +1.84% | +2.02% | |
| Form SD AXCELIS TECHNOLOGIES | SEC filing · Form SD | SEC EDGAR | -0.82% | -1.43% | |
| Axcelis Announces Participation in Upcoming Investor Conferences | Press release | PR Newswire | +0.03% | +1.53% | |
| Form 10-Q AXCELIS TECHNOLOGIES For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.44% | +1.68% | |
| Axcelis Announces Financial Results for First Quarter 2026 | Press release | PR Newswire | -1.04% | +3.68% | |
| Form 8-K AXCELIS TECHNOLOGIES For: May 07 | SEC filing · Form 8-K | SEC EDGAR | -1.04% | +3.68% | |
| Axcelis to Participate in ASMC 2026 | Press release | PR Newswire | +4.54% | +9.09% | |
| Form 8-K AXCELIS TECHNOLOGIES For: May 05 | SEC filing · Form 8-K | SEC EDGAR | -4.08% | -5.86% | |
| Axcelis Announces Timing and Availability of First Quarter 2026 Results and Conference Call | Press release | PR Newswire | -1.04% | +0.24% | |
| Form ARS AXCELIS TECHNOLOGIES For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | +0.35% | +1.32% | |
| Form DEF 14A AXCELIS TECHNOLOGIES For: May 05 | SEC filing · Form DEF | SEC EDGAR | +0.35% | +1.32% | |
| Axcelis Announces SBTi Approval of Science-Based Greenhouse Gas Emissions Reduction Targets | Press release | PR Newswire | -2.06% | -8.69% | |
| Axcelis Announces Participation in SEMICON China 2026 | Press release | PR Newswire | +0.08% | +4.33% | |
| Axcelis Announces Participation in SEMICON China 2026 | Press release | PR Newswire | +0.08% | +4.33% | |
| Axcelis Announces CFO Transition | Press release | PR Newswire | +2.73% | +1.54% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Mar 10 | SEC filing · Form 8-K | SEC EDGAR | +2.73% | +1.54% | |
| Form 10-K AXCELIS TECHNOLOGIES For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.36% | +0.13% | |
| Axcelis Announces Participation in Upcoming Investor Conferences | Press release | PR Newswire | -1.75% | -1.65% | |
| Axcelis Announces Financial Results for Fourth Quarter and Full Year 2025 | Press release | PR Newswire | +1.04% | +5.30% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Feb 17 | SEC filing · Form 8-K | SEC EDGAR | +1.04% | +5.30% | |
| Axcelis Stockholders Approve Merger with Veeco | Press release | PR Newswire | -1.32% | +0.00% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Feb 06 | SEC filing · Form 8-K | SEC EDGAR | -1.32% | +0.00% | |
| Axcelis Announces Participation in SEMICON Korea 2026 | Press release | PR Newswire | +1.15% | -2.77% | |
| Axcelis Unveils Purion H6: Next-Generation High Current Ion Implanter for Advanced Semiconductor Manufacturing | Press release | PR Newswire | +1.15% | -2.77% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Jan 22 | SEC filing · Form 8-K | SEC EDGAR | +2.85% | +3.40% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Jan 28 | SEC filing · Form 8-K | SEC EDGAR | -0.27% | +0.26% | |
| Axcelis Announces Timing and Availability of Fourth Quarter and Full Year 2025 Results and Conference Call | Press release | PR Newswire | -0.92% | -1.87% | |
| Axcelis to Participate in the 28th Annual Needham Growth Conference | Press release | PR Newswire | +0.61% | -2.63% | |
| Form EFFECT AXCELIS TECHNOLOGIES | SEC filing · Form EFFECT | SEC EDGAR | +2.05% | +5.53% | |
| Form S-4/A AXCELIS TECHNOLOGIES | SEC filing · Form S-4 | SEC EDGAR | -0.09% | -0.55% | |
| Axcelis to Showcase Advanced Ion Implant Solutions at SEMICON Japan 2025 | Press release | PR Newswire | +1.99% | +2.53% | |
| Halper Sadeh LLC Encourages ZEUS, ACLS, VECO Shareholders to Contact the Firm to Discuss Their Rights | Press release | PR Newswire | -0.03% | +0.30% | |
| Axcelis to Showcase Advanced Ion Implant Solutions at SEMICON Japan 2025 | Press release | PR Newswire | +1.99% | +2.53% | |
| Form S-4 AXCELIS TECHNOLOGIES | SEC filing · Form S-4 | SEC EDGAR | +0.08% | -1.53% | |
| Halper Sadeh LLC Encourages ACLS, VECO, CLCO Shareholders to Contact the Firm to Discuss Their Rights | Press release | GlobeNewswire | +0.92% | +2.24% | |
| Axcelis Announces Participation in Upcoming Investor Conferences | Press release | PR Newswire | +0.00% | -2.27% | |
| Form 10-Q AXCELIS TECHNOLOGIES For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.19% | -0.52% | |
| Axcelis Announces Financial Results for Third Quarter 2025 | Press release | PR Newswire | -4.20% | -9.98% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Nov 04 | SEC filing · Form 8-K | SEC EDGAR | -4.20% | -9.98% | |
| HALPER SADEH LLC ENCOURAGES TGNA, GES, ACLS SHAREHOLDERS TO CONTACT THE FIRM TO DISCUSS THEIR RIGHTS | Press release | PR Newswire | -0.05% | +0.18% | |
| Axcelis Announces Timing and Availability of Third Quarter 2025 Results and Conference Call | Press release | PR Newswire | +0.81% | -0.97% | |
| ACLS Stock Alert: Halper Sadeh LLC Is Investigating Whether the Merger of Axcelis Technologies, Inc. Is Fair to Shareholders | Press release | Business Wire | -3.13% | +0.93% | |
| Axcelis Technologies and Veeco Instruments to Combine, Creating a Leading Semiconductor Equipment Company | Press release | PR Newswire | -3.13% | +0.93% | |
| Form 8-K AXCELIS TECHNOLOGIES For: Oct 01 | SEC filing · Form 8-K | SEC EDGAR | -3.13% | +0.93% | |
| Axcelis Announces Participation in The International Conference on Silicon Carbide and Related Materials (ICSCRM 2025) | Press release | PR Newswire | +0.91% | +1.64% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ACLS section they belong to.
More of the dataset.
ACLS earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Axcelis Technologies, Inc.'s median reaction calculated?
Every labeled ACLS 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 375 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. 48% of ACLS'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 2026-08-13.
Does ACLS'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.