Allegro MicroSystems, Inc. (ALGM)
ALGM moved a median of -0.47% 30 minutes after news, and -0.58% by the close. How ALGM actually reacts to news — the realized, point-in-time move the market made, measured across 308 labeled events over the last three years with zero look-ahead.
ALGM’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | -0.16% | 43% | 308 |
| 30-min | -0.47% | 33% | 308 |
| 60-min | -0.54% | 38% | 308 |
| to close | -0.58% | 40% | 307 |
| Middle 50% of ALGM reactions | -1.44% to +0.29% |
|---|---|
| Median reaction (30-min) | -0.47% |
| Measured reactions | 308 |
Half of all Allegro MicroSystems, Inc. news events land between -1.44% 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 ALGM reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 11 | -1.46% | 18% | -1.53% |
| Coverage initiations | 22 | +0.09% | 59% | +0.01% |
| Rating reiterations | 80 | -0.04% | 45% | -0.34% |
| Price-target raises | 27 | -0.24% | 37% | +0.47% |
| Price-target cuts | 14 | -0.08% | 43% | -0.52% |
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 ALGM ranks against every other measured name →
That’s how ALGM usually reacts — get an email when it moves on news →Email me when ALGM moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to ALGM's baseline. Nothing else.
Recent ALGM events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Allegro MicroSystems to Announce Second Quarter Fiscal Year 2027 Financial Results | Press release | GlobeNewswire | +0.19% | -0.49% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | +0.98% | +0.18% | |
| Form 10-Q ALLEGRO MICROSYSTEMS, For: Jun 26 | SEC filing · Form 10-Q | SEC EDGAR | +1.57% | -1.82% | |
| Allegro MicroSystems Reports First Quarter 2027 Results | Press release | GlobeNewswire | -3.52% | -1.50% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jul 30 | SEC filing · Form 8-K | SEC EDGAR | -3.52% | -1.50% | |
| Allegro MicroSystems to Announce First Quarter Fiscal Year 2027 Financial Results | Press release | GlobeNewswire | +2.00% | +5.48% | |
| Allegro MicroSystems Unveils Industry's First Safety PMIC to Integrate a Wheel-Speed Sensor Interface for Electromechanical Braking | Press release | GlobeNewswire | -1.32% | -12.46% | |
| Form ARS ALLEGRO MICROSYSTEMS, For: Mar 27 | SEC filing · Form ARS | SEC EDGAR | -1.01% | -0.47% | |
| Form DEF 14A ALLEGRO MICROSYSTEMS, For: Aug 05 | SEC filing · Form DEF | SEC EDGAR | -1.01% | -0.47% | |
| Form DEFA14A ALLEGRO MICROSYSTEMS, | SEC filing · Form DEFA14A | SEC EDGAR | -1.01% | -0.47% | |
| Allegro MicroSystems Appoints Brian White to its Board of Directors | Press release | GlobeNewswire | -1.15% | +3.15% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jun 17 | SEC filing · Form 8-K | SEC EDGAR | -1.15% | +3.15% | |
| Form SD ALLEGRO MICROSYSTEMS, | SEC filing · Form SD | SEC EDGAR | +0.46% | -7.50% | |
| Form 10-K ALLEGRO MICROSYSTEMS, For: Mar 27 | SEC filing · Form 10-K | SEC EDGAR | +0.40% | +1.64% | |
| Allegro MicroSystems Appoints Robert Willett to its Board of Directors | Press release | GlobeNewswire | -2.19% | -2.37% | |
| Allegro MicroSystems to Present at TD Cowen’s 54th Annual Technology, Media & Telecom Conference on Wednesday, May 27, 2026 | Press release | GlobeNewswire | -0.34% | -3.55% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: May 11 | SEC filing · Form 8-K | SEC EDGAR | -2.19% | -2.37% | |
| Allegro MicroSystems Reports Fourth Quarter and Fiscal Year 2026 Results | Press release | GlobeNewswire | +4.84% | +10.18% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: May 07 | SEC filing · Form 8-K | SEC EDGAR | +4.84% | +10.18% | |
| Allegro MicroSystems to Announce Fourth Quarter and Fiscal Year 2026 Financial Results | Press release | GlobeNewswire | -0.26% | +0.21% | |
| Allegro MicroSystems Expands Current Sensing Leadership with Industry’s Highest Accuracy Magnetic Current Sensor | Press release | GlobeNewswire | -1.29% | -0.91% | |
| Allegro MicroSystems Appoints Ian Kent, Senior Vice President, Operations and Jamie Haas Vice President, Chief Technology Officer | Press release | GlobeNewswire | +3.74% | +3.07% | |
| Form 10-Q ALLEGRO MICROSYSTEMS, For: Dec 26 | SEC filing · Form 10-Q | SEC EDGAR | +2.99% | -0.62% | |
| Allegro MicroSystems Reports Third Quarter 2026 Results | Press release | GlobeNewswire | +6.14% | +2.81% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jan 29 | SEC filing · Form 8-K | SEC EDGAR | +6.14% | +2.81% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jan 21 | SEC filing · Form 8-K | SEC EDGAR | -0.97% | -2.14% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | +0.39% | +0.94% | |
| Allegro MicroSystems to Host Analyst Day on February 18, 2026 | Press release | GlobeNewswire | +0.62% | +0.75% | |
| Allegro MicroSystems to Announce Third Quarter Fiscal Year 2026 Financial Results | Press release | GlobeNewswire | -0.24% | +2.32% | |
| Allegro MicroSystems Sets New Standard for Efficiency in High-Power Systems with Ultra-Low-Loss Isolated Current Sensor | Press release | GlobeNewswire | +4.23% | +2.97% | |
| Allegro MicroSystems Simplifies SiC Power Design for AI Data Centers and EVs with Expanded Power-Thru(TM) Gate Driver Portfolio | Press release | GlobeNewswire | +0.78% | -5.20% | |
| Allegro MicroSystems to Present at the 53rd Annual Nasdaq Investor Conference held in Association with Morgan Stanley Wednesday, December 10, 2025 | Press release | GlobeNewswire | -0.27% | -0.15% | |
| Form 10-Q ALLEGRO MICROSYSTEMS, For: Sep 26 | SEC filing · Form 10-Q | SEC EDGAR | +1.97% | -1.90% | |
| Allegro MicroSystems Reports Second Quarter 2026 Results | Press release | GlobeNewswire | -3.19% | -10.18% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Oct 30 | SEC filing · Form 8-K | SEC EDGAR | -3.19% | -10.18% | |
| Allegro MicroSystems Unveils Industry’s First Production-Ready 10 MHz TMR Current Sensor, Enabling Optimal Protection and Control of Wide Bandgap Power Electronics | Press release | GlobeNewswire | +0.03% | +1.50% | |
| Allegro MicroSystems Appoints Troy Coleman as Senior Vice President, General Manager, Products | Press release | GlobeNewswire | +0.43% | +3.41% | |
| Allegro MicroSystems to Announce Second Quarter Fiscal Year 2026 Financial Results | Press release | GlobeNewswire | -0.81% | -1.84% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Aug 07 | SEC filing · Form 8-K | SEC EDGAR | -0.32% | -3.37% | |
| Form 10-Q ALLEGRO MICROSYSTEMS, For: Jun 27 | SEC filing · Form 10-Q | SEC EDGAR | -0.06% | +0.42% | |
| Allegro MicroSystems Reports First Quarter 2026 Results | Press release | GlobeNewswire | -2.94% | -1.91% | |
| Form 8-K ALLEGRO MICROSYSTEMS, For: Jul 31 | SEC filing · Form 8-K | SEC EDGAR | -2.94% | -1.91% | |
| Allegro MicroSystems to Announce First Quarter Fiscal Year 2026 Financial Results | Press release | GlobeNewswire | -0.56% | -0.32% | |
| Form ARS ALLEGRO MICROSYSTEMS, For: Mar 28 | SEC filing · Form ARS | SEC EDGAR | -0.42% | -0.05% | |
| Form DEF 14A ALLEGRO MICROSYSTEMS, For: Aug 07 | SEC filing · Form DEF | SEC EDGAR | -0.42% | -0.05% | |
| Form DEFA14A ALLEGRO MICROSYSTEMS, | SEC filing · Form DEFA14A | SEC EDGAR | -0.42% | -0.05% | |
| Form 10-K ALLEGRO MICROSYSTEMS, For: Mar 28 | SEC filing · Form 10-K | SEC EDGAR | -0.42% | -1.93% | |
| Form SD ALLEGRO MICROSYSTEMS, | SEC filing · Form SD | SEC EDGAR | -0.42% | -1.93% | |
| Allegro MicroSystems to Present at TD Cowen’s 53rd Annual Technology, Media & Telecom Conference on Thursday, May 29, 2025 | Press release | GlobeNewswire | +1.54% | +1.73% | |
| Allegro MicroSystems Reports Fourth Quarter and Fiscal Year 2025 Results | Press release | GlobeNewswire | -0.68% | +5.35% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the ALGM section they belong to.
Where else ALGM is measured.
ALGM earnings → · Analyst actions → · SEC filings →
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How the numbers are made.
How is Allegro MicroSystems, Inc.'s median reaction calculated?
Every labeled ALGM 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 308 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. 33% of ALGM'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 ALGM'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.