Altair Engineering Inc. - Class A (ALTR)
ALTR moved a median of -0.02% 30 minutes after news, and 0.00% by the close. How ALTR actually reacts to news — the realized, point-in-time move the market made, measured across 654 labeled events over the last three years with zero look-ahead.
ALTR’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 43% | 612 |
| 30-min | -0.02% | 46% | 616 |
| 60-min | -0.01% | 48% | 616 |
| to close | 0.00% | 49% | 616 |
| Middle 50% of ALTR reactions | -0.21% to +0.35% |
|---|---|
| Median reaction (30-min) | -0.02% |
| Measured reactions | 654 |
Half of all Altair Engineering Inc. - Class A news events land between -0.21% and +0.35% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How ALTR reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst downgrades | 16 | -0.17% | 31% | -0.38% |
| Rating reiterations | 26 | +0.03% | 58% | +0.02% |
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 ALTR ranks against every other measured name →
That’s how ALTR usually reacts — get an email when it moves on news →Email me when ALTR moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ALTR's baseline. Nothing else.
Recent ALTR events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 15-12G Altair Engineering Inc. | SEC filing · Form 15-12G | SEC EDGAR | — | — | |
| Form 8-K Altair Engineering Inc. For: Mar 26 | SEC filing · Form 8-K | SEC EDGAR | — | — | |
| Form POSASR Altair Engineering Inc. | SEC filing · Form POSASR | SEC EDGAR | — | — | |
| Form S-8 POS Altair Engineering Inc. | SEC filing · Form S-8 | SEC EDGAR | — | — | |
| Form 10-K/A Altair Engineering Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | — | — | |
| Altair and JetZero Join Forces to Propel Aerospace Innovation | Press release | PR Newswire | +0.13% | +0.04% | |
| Altair One® Cloud Innovation Gateway Achieves Seamless Integration with NVIDIA Omniverse Blueprint for Real-Time Digital Twins | Press release | PR Newswire | +0.00% | +0.20% | |
| Altair Names Var Group as Channel Partner for EMEA Region | Press release | PR Newswire | +0.11% | +0.04% | |
| Altair to Showcase Leading AI, Simulation, and HPC Technologies at Hannover Messe 2025 | Press release | PR Newswire | -0.03% | +0.11% | |
| Altair Joins the Piedmont Aerospace Cluster | Press release | Canada Newswire | +0.05% | -0.07% | |
| Altair Announces Fourth Quarter and Full Year 2024 Financial Results | Press release | GlobeNewswire | +0.07% | +0.04% | |
| Form 10-K Altair Engineering Inc. For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.07% | +0.04% | |
| Form 8-K Altair Engineering Inc. For: Feb 20 | SEC filing · Form 8-K | SEC EDGAR | +0.07% | +0.04% | |
| Altair Releases Altair® HyperWorks® 2025 | Press release | Canada Newswire | -0.13% | +0.05% | |
| Altair and LTTS Launch 5G-6G Wireless Center of Excellence to Shape the Future of Telecommunications Innovation | Press release | Canada Newswire | -0.05% | +0.09% | |
| Altair Announces Future.Industry 2025 Global Event | Press release | PR Newswire | -0.03% | +0.07% | |
| Altair Names Adastra GmbH as Channel Partner for EMEA Region | Press release | PR Newswire | -0.03% | +0.07% | |
| Meridian Flight Systems Joins Altair Aerospace Startup Acceleration Program (ASAP) | Press release | Canada Newswire | +0.08% | +0.04% | |
| Altair Announces Next-Level Enhancements Within Altair® HPCWorks® 2025 | Press release | PR Newswire | -0.04% | +0.00% | |
| 2025 Altair Enlighten Award Open for Submissions | Press release | PR Newswire | -0.04% | +0.00% | |
| Altair and Cranfield University Sign MoU to Advance Use of Simulation, Data Analytics, and AI | Press release | Canada Newswire | -0.03% | -0.10% | |
| Altair Engineering Inc. Stockholders Approve Proposed Merger with Siemens | Press release | Canada Newswire | -0.01% | +0.08% | |
| Form 8-K Altair Engineering Inc. For: Jan 22 | SEC filing · Form 8-K | SEC EDGAR | -0.01% | +0.08% | |
| Form 8-K Altair Engineering Inc. For: Jan 16 | SEC filing · Form 8-K | SEC EDGAR | -0.03% | -0.02% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.03% | -0.02% | |
| ALTR Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of Altair Engineering Inc. Is Fair to Shareholders | Press release | Business Wire | +0.51% | +0.73% | |
| Altair® RapidMiner® Unlocks Next-Level Capabilities with Advanced AI Agent Framework | Press release | PR Newswire | +0.12% | -1.07% | |
| Form DEFM14A Altair Engineering Inc. | SEC filing · Form DEFM14A | SEC EDGAR | -0.09% | +0.39% | |
| Altair Names Alexander Thamm GmbH as Channel Partner | Press release | PR Newswire | +0.04% | +0.35% | |
| Altair Announces Partnership with CGI to Drive IT Modernization and AI Innovation | Press release | PR Newswire | -0.40% | -0.23% | |
| Altair and Auburn University to Collaborate on $1.25 Million AFWERX Contract to Advance Vortex Rocket Engines | Press release | PR Newswire | +0.02% | +0.07% | |
| Altair and Auburn University to Collaborate on $1.25 Million AFWERX Contract to Advance Vortex Rocket Engines | Press release | PR Newswire | -0.28% | +0.09% | |
| Form PREM14A Altair Engineering Inc. For: Dec 04 | SEC filing · Form PREM14A | SEC EDGAR | +0.02% | +0.07% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.01% | +0.81% | |
| Altair Technology Powers Cleveland Golf's New HiBore XL Driver | Press release | PR Newswire | -0.07% | +0.29% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.20% | +0.18% | |
| Altair Solutions Now Supported on NVIDIA Grace Hopper and Grace CPU Superchip Architectures | Press release | PR Newswire | +0.05% | -0.02% | |
| Altair Collaborates with Aerospace Startup Moya Aero to Develop eVTOLs | Press release | Canada Newswire | +0.00% | -0.10% | |
| Altair Signs Collaboration Agreement with the European Space Agency | Press release | PR Newswire | +0.10% | +0.10% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.01% | -0.34% | |
| Altair® PollEx™ for ECAD Now Available | Press release | PR Newswire | +0.01% | -0.35% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.18% | -0.42% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | +0.40% | |
| ALERT: Rowley Law PLLC is Investigating Proposed Acquisition of Altair Engineering Inc. | Press release | PR Newswire | +0.18% | -0.06% | |
| ALTR Stock Alert: Halper Sadeh LLC Is Investigating Whether the Sale of Altair Engineering Inc. Is Fair to Shareholders | Press release | Business Wire | -0.65% | -0.38% | |
| Form 10-Q Altair Engineering Inc. For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.06% | -0.10% | |
| Form DEFA14A Altair Engineering Inc. | SEC filing · Form DEFA14A | SEC EDGAR | -0.65% | -0.38% | |
| Altair Announces Third Quarter 2024 Financial Results | Press release | GlobeNewswire | -0.65% | -0.38% | |
| Altair Signs Definitive Agreement with Siemens to be Acquired for $10.6 Billion | Press release | GlobeNewswire | -0.65% | -0.38% | |
| Form 8-K Altair Engineering Inc. For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | -0.65% | -0.38% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ALTR section they belong to.
Where else ALTR is measured.
ALTR earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| ELECTRO SCIENTIFIC (ESIO) | 658 | 0.00% | 50% |
| Wireless Telecom Group, Inc. (WTT) | 658 | 0.00% | 43% |
| Ciena Corporation (CIEN) | 652 | -0.02% | 49% |
| CYREN Ltd. - Ordinary Shares (CYRN) | 652 | 0.00% | 36% |
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.
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Every name we’ve measured, in one place.
How the numbers are made.
How is Altair Engineering Inc. - Class A's median reaction calculated?
Every labeled ALTR 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 654 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 ALTR'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 ALTR'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.