SemiLEDS Corporation (LEDS)
LEDS moved a median of -0.75% 30 minutes after news, and -2.62% by the close. How LEDS actually reacts to news — the realized, point-in-time move the market made, measured across 93 labeled events over the last three years with zero look-ahead.
LEDS’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 38% | 69 |
| 30-min | -0.75% | 34% | 83 |
| 60-min | -0.79% | 35% | 89 |
| to close | -2.62% | 26% | 93 |
| Middle 50% of LEDS reactions | -3.21% to +1.18% |
|---|---|
| Median reaction (30-min) | -0.75% |
| Measured reactions | 93 |
Half of all SemiLEDS Corporation news events land between -3.21% and +1.18% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
Email me when LEDS moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to LEDS's baseline. Nothing else.
Recent LEDS events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Form 8-K SemiLEDs Corp For: Aug 28 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | +2.14% | |
| Form 8-K SemiLEDs Corp For: Jul 27 | SEC filing · Form 8-K | SEC EDGAR | -1.83% | -10.50% | |
| Form 8-K SemiLEDs Corp For: Jul 15 | SEC filing · Form 8-K | SEC EDGAR | -1.98% | +7.98% | |
| Form 8-K/A SemiLEDs Corp For: Jul 14 | SEC filing · Form 8-K | SEC EDGAR | -1.98% | +7.98% | |
| Form ARS SemiLEDs Corp For: Aug 31 | SEC filing · Form ARS | SEC EDGAR | -1.98% | +7.98% | |
| Form DEF 14A SemiLEDs Corp For: Jul 15 | SEC filing · Form DEF | SEC EDGAR | -1.98% | +7.98% | |
| Form DEFA14A SemiLEDs Corp | SEC filing · Form DEFA14A | SEC EDGAR | -1.98% | +7.98% | |
| Form 10-Q SemiLEDs Corp For: May 31 | SEC filing · Form 10-Q | SEC EDGAR | +1.75% | +30.99% | |
| Form 8-K SemiLEDs Corp For: Jul 14 | SEC filing · Form 8-K | SEC EDGAR | +1.75% | +30.99% | |
| SemiLEDs Reports Third Quarter Fiscal Year 2026 Financial Results | Press release | Business Wire | +1.75% | +30.99% | |
| Form SD SemiLEDs Corp | SEC filing · Form SD | SEC EDGAR | +3.36% | -2.39% | |
| Form 10-Q SemiLEDs Corp For: Feb 28 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | -3.17% | |
| Form 8-K SemiLEDs Corp For: Apr 14 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -3.17% | |
| SemiLEDs Reports Second Quarter Fiscal Year 2026 Financial Results | Press release | Business Wire | +0.00% | -3.17% | |
| Form 8-K SemiLEDs Corp For: Jan 30 | SEC filing · Form 8-K | SEC EDGAR | +2.40% | -4.19% | |
| Form 8-K SemiLEDs Corp For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | — | -2.03% | |
| Form 10-Q SemiLEDs Corp For: Nov 30 | SEC filing · Form 10-Q | SEC EDGAR | -4.93% | -2.62% | |
| Form 8-K SemiLEDs Corp For: Jan 14 | SEC filing · Form 8-K | SEC EDGAR | -4.93% | -2.62% | |
| SemiLEDs Reports First Quarter Fiscal Year 2026 Financial Results | Press release | Business Wire | -4.93% | -2.62% | |
| Form 10-K SemiLEDs Corp For: Aug 31 | SEC filing · Form 10-K | SEC EDGAR | -0.23% | -13.68% | |
| Form 8-K SemiLEDs Corp For: Nov 28 | SEC filing · Form 8-K | SEC EDGAR | -1.08% | -15.83% | |
| SemiLEDs Reports Fourth Quarter and Fiscal Year End 2025 Financial Results | Press release | Business Wire | -1.08% | -15.83% | |
| Form 8-K SemiLEDs Corp For: Aug 28 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -1.15% | |
| Form ARS SemiLEDs Corp For: Aug 31 | SEC filing · Form ARS | SEC EDGAR | +0.38% | -3.45% | |
| Form DEF 14A SemiLEDs Corp For: Jul 14 | SEC filing · Form DEF | SEC EDGAR | +0.38% | -3.45% | |
| Form DEFA14A SemiLEDs Corp | SEC filing · Form DEFA14A | SEC EDGAR | +0.38% | -3.45% | |
| Form 10-Q SemiLEDs Corp For: May 31 | SEC filing · Form 10-Q | SEC EDGAR | -2.89% | -5.78% | |
| Form 8-K SemiLEDs Corp For: Jul 11 | SEC filing · Form 8-K | SEC EDGAR | +4.00% | +0.00% | |
| SemiLEDs Reports Third Quarter Fiscal Year 2025 Financial Results | Press release | Business Wire | +4.00% | +0.00% | |
| Form SD SemiLEDs Corp | SEC filing · Form SD | SEC EDGAR | +2.25% | +0.94% | |
| Form 8-K SemiLEDs Corp For: Apr 15 | SEC filing · Form 8-K | SEC EDGAR | -4.96% | +5.00% | |
| The World's Smallest PPG Sensor Head | Press release | Business Wire | +2.38% | +1.06% | |
| Form 10-Q SemiLEDs Corp For: Feb 28 | SEC filing · Form 10-Q | SEC EDGAR | +1.79% | -4.62% | |
| Form 8-K SemiLEDs Corp For: Apr 10 | SEC filing · Form 8-K | SEC EDGAR | -4.64% | -15.61% | |
| SemiLEDs Reports Second Quarter Fiscal Year 2025 Financial Results | Press release | Business Wire | -4.64% | -15.61% | |
| The World's Smallest PPG Sensor Head | Press release | Business Wire | -2.04% | -5.20% | |
| Form 8-K SemiLEDs Corp For: Feb 28 | SEC filing · Form 8-K | SEC EDGAR | +3.59% | -3.11% | |
| Form 8-K SemiLEDs Corp For: Jan 15 | SEC filing · Form 8-K | SEC EDGAR | +0.00% | -1.97% | |
| Form 10-Q SemiLEDs Corp For: Nov 30 | SEC filing · Form 10-Q | SEC EDGAR | +0.00% | +7.09% | |
| Form 8-K SemiLEDs Corp For: Jan 10 | SEC filing · Form 8-K | SEC EDGAR | +2.65% | -2.94% | |
| SemiLEDs Reports First Quarter Fiscal Year 2025 Financial Results | Press release | Business Wire | +2.65% | -2.94% | |
| Form 8-K SemiLEDs Corp For: Dec 04 | SEC filing · Form 8-K | SEC EDGAR | -2.42% | +3.23% | |
| Form 10-K SemiLEDs Corp For: Aug 31 | SEC filing · Form 10-K | SEC EDGAR | -5.53% | -6.57% | |
| Form 8-K SemiLEDs Corp For: Nov 27 | SEC filing · Form 8-K | SEC EDGAR | -5.53% | -6.57% | |
| SemiLEDs Reports Fourth Quarter and Fiscal Year End 2024 Financial Results | Press release | Business Wire | -5.53% | -6.57% | |
| Form 8-K/A SemiLEDs Corp For: Aug 29 | SEC filing · Form 8-K | SEC EDGAR | — | -2.41% | |
| Form 8-K SemiLEDs Corp For: Sep 05 | SEC filing · Form 8-K | SEC EDGAR | — | -0.72% | |
| Form 8-K SemiLEDs Corp For: Aug 29 | SEC filing · Form 8-K | SEC EDGAR | — | -3.65% | |
| Form ARS SemiLEDs Corp For: Aug 31 | SEC filing · Form ARS | SEC EDGAR | — | +0.72% | |
| Form DEF 14A SemiLEDs Corp For: Jul 15 | SEC filing · Form DEF | SEC EDGAR | — | +0.72% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the LEDS section they belong to.
Where else LEDS is measured.
LEDS earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| ROHM CO LTD UNSP/ADR (ROHCY) | 95 | 0.00% | 28% |
| SigmaTron International, Inc. (SGMA) | 94 | +0.17% | 54% |
| Quarter Hill Inc (QTRH_TSE) | 93 | 0.00% | 46% |
| PROPHOTONIX LTD (STKR) | 93 | 0.00% | 35% |
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 SemiLEDS Corporation's median reaction calculated?
Every labeled LEDS 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 93 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. 34% of LEDS'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 LEDS'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.