Alpha and Omega Semiconductor Limited - Common Shares (AOSL)
AOSL moved a median of +0.24% 30 minutes after news, and +0.40% by the close. How AOSL actually reacts to news — the realized, point-in-time move the market made, measured across 295 labeled events over the last three years with zero look-ahead.
AOSL’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 49% | 293 |
| 30-min | +0.24% | 54% | 295 |
| 60-min | +0.07% | 51% | 295 |
| to close | +0.40% | 55% | 286 |
| Middle 50% of AOSL reactions | -0.89% to +1.25% |
|---|---|
| Median reaction (30-min) | +0.24% |
| Measured reactions | 295 |
Half of all Alpha and Omega Semiconductor Limited - Common Shares news events land between -0.89% and +1.25% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How AOSL reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 18 | +0.72% | 67% | +1.32% |
| Analyst downgrades | 20 | -0.09% | 50% | -0.54% |
| Rating reiterations | 25 | -0.16% | 48% | -0.42% |
| Price-target cuts | 12 | +0.16% | 50% | -0.34% |
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 AOSL ranks against every other measured name →
That’s how AOSL usually reacts — get an email when it moves on news →Email me when AOSL moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to AOSL's baseline. Nothing else.
Recent AOSL events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Alpha and Omega Semiconductor to Announce Fiscal First Quarter Financial Results on November 5, 2026 | Press release | Business Wire | -0.08% | -6.42% | |
| Form ARS ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form ARS | SEC EDGAR | +0.00% | +4.76% | |
| Form DEF 14A ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form DEF | SEC EDGAR | +0.00% | +4.76% | |
| Form DEFA14A ALPHA & OMEGA SEMICONDUC | SEC filing · Form DEFA14A | SEC EDGAR | +0.00% | +4.76% | |
| Alpha and Omega Semiconductor Announces Participation in 18th Annual CEO Investor Summit | Press release | Business Wire | -1.66% | -1.74% | |
| Alpha and Omega Semiconductor’s New aMOS E2™ 600V Super Junction MOSFETs Support Optimized Electrical/Thermal Paths, Boosted System Performance and Long-Term Reliability | Press release | Business Wire | +0.91% | -1.92% | |
| Form 10-K ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form 10-K | SEC EDGAR | -1.77% | -5.34% | |
| Form S-8 ALPHA & OMEGA SEMICONDUC | SEC filing · Form S-8 | SEC EDGAR | -1.77% | -5.34% | |
| Alpha and Omega Semiconductor Reports Financial Results for Fiscal Fourth Quarter and Fiscal Year Ended June 30, 2026 | Press release | Business Wire | +10.94% | +3.03% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Aug 12 | SEC filing · Form 8-K | SEC EDGAR | +10.94% | +3.03% | |
| Alpha and Omega Semiconductor to Announce Fiscal Fourth Quarter and Fiscal Year 2026 Financial Results on August 12, 2026 | Press release | Business Wire | -0.47% | +0.11% | |
| Alpha and Omega Semiconductor Announces Appointment of New Director | Press release | Business Wire | +0.59% | -2.88% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Jul 08 | SEC filing · Form 8-K | SEC EDGAR | +0.59% | -2.88% | |
| Alpha and Omega Semiconductor Unveils AmpStack™ Packaging: A Leap Forward in MOSFET Power Density | Press release | Business Wire | +0.00% | +1.97% | |
| See Alpha and Omega Semiconductor at PCIM 2026 to Learn About Their Advanced AI Core Power, AI Data Center, and Industrial Power Solutions | Press release | Business Wire | +4.97% | -0.09% | |
| Alpha and Omega Semiconductor Unveils Total Power Solution for Next-Gen Intel Panther Lake and Wildcat Lake Platforms | Press release | Business Wire | -0.41% | -6.01% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: May 11 | SEC filing · Form 8-K | SEC EDGAR | +2.84% | +4.05% | |
| Alpha and Omega Semiconductor Reports Financial Results for the Fiscal Third Quarter of 2026 Ended March 31, 2026 | Press release | Business Wire | -0.33% | -5.05% | |
| Form 10-Q ALPHA & OMEGA SEMICONDUC For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | -0.33% | -5.05% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: May 06 | SEC filing · Form 8-K | SEC EDGAR | -0.33% | -5.05% | |
| Alpha and Omega Semiconductor Unveils SmartClamp™ Protected DrMOS Family for AI Servers and High-End GPUs | Press release | Business Wire | -1.97% | +6.73% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Apr 13 | SEC filing · Form 8-K | SEC EDGAR | +1.04% | +13.61% | |
| Alpha and Omega Semiconductor Announces Commencement of Production of Intelligent Power Module (IPM5) Products at Kaynes Semicon Inaugural Opening in Sanand, Gujarat | Press release | Business Wire | +7.21% | +9.56% | |
| Alpha and Omega Semiconductor to Announce Fiscal Third Quarter Financial Results on May 6, 2026 | Press release | Business Wire | -1.81% | +3.72% | |
| Alpha and Omega Semiconductor Introduces 25V and 80V MOSFETs in State-of-the-Art Packaging that Meets Increasing AI Server Power Demands | Press release | Business Wire | +0.23% | -1.39% | |
| At APEC 2026, Alpha and Omega Semiconductor to Showcase Advanced Solutions for AI Core Power, AI Factory, and Industrial Power | Press release | Business Wire | -1.12% | +0.70% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Mar 05 | SEC filing · Form 8-K | SEC EDGAR | +1.16% | +1.67% | |
| Form SD ALPHA & OMEGA SEMICONDUC | SEC filing · Form SD | SEC EDGAR | +2.05% | +5.53% | |
| Alpha and Omega Semiconductor Reports Financial Results for the Fiscal Second Quarter of 2026 Ended December 31, 2025 | Press release | Business Wire | +2.44% | +19.00% | |
| Form 10-Q ALPHA & OMEGA SEMICONDUC For: Dec 31 | SEC filing · Form 10-Q | SEC EDGAR | +2.44% | +19.00% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Feb 05 | SEC filing · Form 8-K | SEC EDGAR | +2.44% | +19.00% | |
| Alpha and Omega Semiconductor Unveils its Powerful aMOS E2™ 600V Super Junction MOSFET Platform | Press release | Business Wire | +0.23% | +0.54% | |
| Alpha and Omega Semiconductor to Announce Fiscal Second Quarter Financial Results on February 5, 2026 | Press release | Business Wire | +1.07% | +0.27% | |
| Alpha and Omega Semiconductor Enables 48V Hot Swap in AI Servers with New High SOA MOSFET in LFPAK 8x8 | Press release | Business Wire | -0.15% | +1.18% | |
| Alpha and Omega Semiconductor to Participate in 14th Annual NYC Summit 2025 | Press release | Business Wire | -0.15% | +1.18% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Nov 11 | SEC filing · Form 8-K | SEC EDGAR | +1.63% | +3.79% | |
| Alpha and Omega Semiconductor Announces $30 Million Share Repurchase Program | Press release | Business Wire | +2.21% | — | |
| Form 10-Q ALPHA & OMEGA SEMICONDUC For: Sep 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.61% | -0.29% | |
| Alpha and Omega Semiconductor Reports Financial Results for the Fiscal First Quarter of 2026 Ended September 30, 2025 | Press release | Business Wire | -4.47% | -2.19% | |
| Form 8-K ALPHA & OMEGA SEMICONDUC For: Nov 05 | SEC filing · Form 8-K | SEC EDGAR | -4.47% | -2.19% | |
| Alpha and Omega Semiconductor to Announce Fiscal First Quarter Financial Results on November 5, 2025 | Press release | Business Wire | +0.66% | +0.55% | |
| Alpha and Omega Semiconductor Supports 800 VDC Power Architecture for Next-Generation AI Factories with Innovative SiC and GaN, Power MOSFET, and Power IC Solutions | Press release | Business Wire | +0.25% | +5.18% | |
| Alpha and Omega Semiconductor to Participate in 17th Annual CEO Investor Summit 2025 | Press release | Business Wire | -1.32% | -3.15% | |
| Form ARS ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form ARS | SEC EDGAR | -0.17% | +0.99% | |
| Form DEF 14A ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form DEF | SEC EDGAR | -0.03% | +1.03% | |
| Form DEFA14A ALPHA & OMEGA SEMICONDUC | SEC filing · Form DEFA14A | SEC EDGAR | +0.10% | +1.17% | |
| Alpha and Omega Semiconductor Unveils Powerful Duo of Protection Switches that Support Type-C EPR 3.1 Extended Power Levels | Press release | Business Wire | +0.42% | -3.13% | |
| Form 10-K ALPHA & OMEGA SEMICONDUC For: Jun 30 | SEC filing · Form 10-K | SEC EDGAR | -0.74% | -3.10% | |
| Form S-8 ALPHA & OMEGA SEMICONDUC | SEC filing · Form S-8 | SEC EDGAR | -0.74% | -3.10% | |
| Alpha and Omega Semiconductor Announces Advanced eFuse that Meets High Reliability Server Application Requirements | Press release | Business Wire | -0.23% | — |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the AOSL section they belong to.
Where else AOSL is measured.
AOSL earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Novanta Inc. - Common Shares (NOVT) | 299 | +0.10% | 52% |
| Kopin Corporation (KOPN) | 297 | -0.67% | 37% |
| PIVOTAL SOFTWARE INC (PVTL) | 295 | 0.00% | 49% |
| SPEED COMM INC (SPDC) | 295 | -0.15% | 30% |
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 Technology names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Alpha and Omega Semiconductor Limited - Common Shares's median reaction calculated?
Every labeled AOSL 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 295 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. 54% of AOSL'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 AOSL'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.