Western Digital Corporation (WDC)
WDC moved a median of +0.15% 30 minutes after news, and +0.59% by the close. How WDC actually reacts to news — the realized, point-in-time move the market made, measured across 594 labeled events over the last three years with zero look-ahead.
WDC’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | +0.17% | 60% | 593 |
| 30-min | +0.15% | 52% | 593 |
| 60-min | +0.52% | 63% | 593 |
| to close | +0.59% | 57% | 592 |
| Middle 50% of WDC reactions | -0.90% to +1.32% |
|---|---|
| Median reaction (30-min) | +0.15% |
| Measured reactions | 594 |
Half of all Western Digital Corporation news events land between -0.90% and +1.32% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How WDC reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 49 | +0.27% | 59% | +0.51% |
| Analyst downgrades | 26 | +0.19% | 62% | +0.54% |
| Coverage initiations | 27 | +0.43% | 67% | +0.15% |
| Rating reiterations | 278 | -0.09% | 46% | +0.12% |
| Price-target raises | 96 | -0.09% | 46% | -0.22% |
| Price-target cuts | 30 | +0.05% | 50% | -0.11% |
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. See how WDC ranks against every other measured name →
That’s how WDC usually reacts — get an email when it moves on news →Email me when WDC moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to WDC's baseline. Nothing else.
Recent WDC events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| WD to Announce First Quarter Fiscal Year 2027 Financial Results on October 22, 2026 | Press release | Business Wire | +0.28% | -1.47% | |
| Form ARS WESTERN DIGITAL CORP For: Jul 03 | SEC filing · Form ARS | SEC EDGAR | -1.20% | -3.66% | |
| Form DEF 14A WESTERN DIGITAL CORP For: Nov 20 | SEC filing · Form DEF | SEC EDGAR | -1.20% | -3.66% | |
| Form DEFA14A WESTERN DIGITAL CORP | SEC filing · Form DEFA14A | SEC EDGAR | -1.20% | -3.66% | |
| As AI Data Surges, WD Outlines a New Path to Economically Scalable Storage Infrastructure | Press release | Business Wire | -1.63% | -4.16% | |
| Form 8-K WESTERN DIGITAL CORP For: Sep 14 | SEC filing · Form 8-K | SEC EDGAR | +0.84% | +1.93% | |
| Western Digital Announces Redemption of 3.00% Convertible Senior Notes Due 2028 | Press release | Business Wire | +0.84% | +1.93% | |
| New Research Reveals the Reshaping of AI Infrastructure Economics as Data Persists and Compounds | Press release | Business Wire | +0.92% | +1.51% | |
| Form 8-K/A WESTERN DIGITAL CORP For: Aug 26 | SEC filing · Form 8-K | SEC EDGAR | -0.39% | -0.62% | |
| Form 8-K WESTERN DIGITAL CORP For: Aug 26 | SEC filing · Form 8-K | SEC EDGAR | +2.30% | +4.01% | |
| WD to Participate in Upcoming Investor Conference | Press release | Business Wire | +0.58% | +0.80% | |
| Form 10-K WESTERN DIGITAL CORP For: Jul 03 | SEC filing · Form 10-K | SEC EDGAR | +0.86% | +2.06% | |
| Form 8-K WESTERN DIGITAL CORP For: Aug 05 | SEC filing · Form 8-K | SEC EDGAR | -1.47% | +5.21% | |
| WD Reports Fiscal Fourth Quarter and Fiscal Year 2026 Financial Results | Press release | Business Wire | -1.47% | +5.21% | |
| WD Malaysia Recognized for Advancing Sustainable AI Infrastructure | Press release | Business Wire | +2.24% | -0.79% | |
| WD to Announce Fourth Quarter and Fiscal Year 2026 Financial Results on August 5, 2026 | Press release | Business Wire | -0.79% | -4.29% | |
| Form 8-K WESTERN DIGITAL CORP For: Jun 11 | SEC filing · Form 8-K | SEC EDGAR | +0.74% | +3.86% | |
| Form 8-K/A WESTERN DIGITAL CORP For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | -1.75% | -2.26% | |
| Form 8-K WESTERN DIGITAL CORP For: Jun 02 | SEC filing · Form 8-K | SEC EDGAR | +3.31% | +3.65% | |
| Form SD WESTERN DIGITAL CORP | SEC filing · Form SD | SEC EDGAR | -2.82% | +0.73% | |
| WD at Computex 2026: AI Doesn't Just Run on Compute - It Runs on Data | Press release | Business Wire | +2.32% | +1.52% | |
| Form 8-K WESTERN DIGITAL CORP For: May 26 | SEC filing · Form 8-K | SEC EDGAR | +0.08% | -1.78% | |
| WD Appoints Manuvir Das to Board of Directors | Press release | Business Wire | +0.08% | -1.78% | |
| WD Customer Survey Highlights Growing Focus on Scale, Economics, and Reliability in AI Infrastructure Planning | Press release | Business Wire | -1.61% | -2.07% | |
| WD Advances Next-Generation Trusted Infrastructure with Industry’s First Post-Quantum Cryptography Hard Drives to Help Secure the Future of AI Data | Press release | Business Wire | -1.59% | -5.60% | |
| WD Named to 2026 S&P Dow Jones Best-in-Class Index North America, Recognizing Leadership in Sustainable AI Infrastructure | Press release | Business Wire | +1.89% | +0.99% | |
| WD Announces Equity-for-Equity Exchange | Press release | Business Wire | -0.86% | +2.69% | |
| Form 10-Q WESTERN DIGITAL CORP For: Apr 03 | SEC filing · Form 10-Q | SEC EDGAR | +0.67% | +5.45% | |
| Form 8-K WESTERN DIGITAL CORP For: Apr 30 | SEC filing · Form 8-K | SEC EDGAR | +0.76% | +6.13% | |
| WD Reports Fiscal Third Quarter 2026 Financial Results | Press release | Business Wire | +0.76% | +6.13% | |
| WD Raises the Bar on Sustainable Infrastructure as AI Storage Demand Accelerates | Press release | Business Wire | -1.10% | +0.63% | |
| WD to Participate in Upcoming Investor Conferences | Press release | Business Wire | +0.24% | -2.48% | |
| WD to Announce Third Quarter Fiscal Year 2026 Financial Results on April 30, 2026 | Press release | Business Wire | -3.01% | +2.44% | |
| Ethisphere Names WD as One of the 2026 World's Most Ethical Companies® for the Eighth Time | Press release | Business Wire | -1.05% | -2.12% | |
| Form 8-K WESTERN DIGITAL CORP For: Feb 23 | SEC filing · Form 8-K | SEC EDGAR | +2.20% | +3.60% | |
| WD Unifies its Professional Content Creator Storage Portfolio Under the G-DRIVE® Brand | Press release | Business Wire | -0.99% | -3.35% | |
| Form 8-K WESTERN DIGITAL CORP For: Feb 17 | SEC filing · Form 8-K | SEC EDGAR | -0.33% | +2.27% | |
| Western Digital to Participate in Upcoming Investor Conference | Press release | Business Wire | +0.10% | +2.43% | |
| Form 8-K WESTERN DIGITAL CORP For: Feb 05 | SEC filing · Form 8-K | SEC EDGAR | -2.60% | +2.03% | |
| Western Digital Accelerates Storage Innovation for AI Era | Press release | Business Wire | -2.16% | -5.77% | |
| Western Digital Authorizes Additional $4.0 Billion of Share Repurchases | Press release | Business Wire | +2.78% | +3.66% | |
| Form 10-Q WESTERN DIGITAL CORP For: Jan 02 | SEC filing · Form 10-Q | SEC EDGAR | -1.94% | -10.12% | |
| Form 8-K WESTERN DIGITAL CORP For: Jan 29 | SEC filing · Form 8-K | SEC EDGAR | -1.94% | -10.12% | |
| Western Digital Reports Fiscal Second Quarter 2026 Financial Results | Press release | Business Wire | -1.94% | -10.12% | |
| Western Digital to Host Innovation Day 2026 in New York City | Press release | Business Wire | -0.67% | +5.63% | |
| Western Digital to Announce Second Quarter Fiscal Year 2026 Financial Results on January 29, 2026 | Press release | Business Wire | +0.79% | +2.43% | |
| Qolab Secures Strategic Investment from Western Digital to Accelerate the Next Wave of Quantum Innovation | Press release | Business Wire | -0.17% | +5.64% | |
| Form 8-K WESTERN DIGITAL CORP For: Nov 20 | SEC filing · Form 8-K | SEC EDGAR | +0.57% | +3.61% | |
| Form S-8 WESTERN DIGITAL CORP | SEC filing · Form S-8 | SEC EDGAR | +0.57% | +3.61% | |
| Western Digital to Participate in Upcoming Investor Conferences | Press release | Business Wire | +0.89% | +0.73% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the WDC section they belong to.
Where else WDC is measured.
WDC earnings → · Analyst actions → · SEC filings →
Other Technology names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| VNET Group, Inc. - American Depositary Shares (VNET) | 596 | -0.39% | 37% |
| PERCEPTRON (PRCP) | 594 | 0.00% | 47% |
| Garmin Ltd. (GRMN) | 592 | +0.07% | 56% |
| Marvell Technology, Inc. (MRVL) | 591 | +0.03% | 50% |
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 Western Digital Corporation's median reaction calculated?
Every labeled WDC 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 594 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. 52% of WDC'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 WDC'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.