Why did WDC stock go down on Friday?

WDC closed at $366.11 on Oct. 30, 2026, up 6.5% over five trading days. When a stock drops like this, the first question is whether the problem is the company or the whole group it trades with.

To answer that, we compare WDC with its closest peers. We also check the calendar for earnings and Fed dates. Then we review Western Digital Corp's latest SEC filings and insider trades.

The chart below tracks WDC's daily closing price from May 6, 2026 to Oct. 30, 2026. Over that stretch it fell 24.2%, from $482.86 to $366.11. The high reached $746.00 on June 18, 2026. The low hit $332.00 on Oct. 16, 2026. Red circles mark weeks when insiders sold shares on the open market. There were 13 such weeks, and bigger circles mean more money. No green diamonds appear because no insider bought on the open market in this window.

WDC vs peers this week

The table below shows how WDC stacks up against its peers this week. Over 5 days, WDC did best (+6.5%) and SNDK worst (-7.0%).

What could be behind the WDC move

The company reported earnings 9 days ago, on Oct. 22, 2026.

The broader market shows a calm uptrend, with the VIX volatility index at 17.2. The Federal Reserve's next rate decision is on Dec. 9, 2026, 39 days away. Market pricing puts the odds at 28% for a hold, 70% for a hike and 1% for a cut.

Also worth knowing about WDC

Live WDC data, updated every 30 minutes: WDC insider trades, ownership and filings →

In Western Digital Corp's own words

“Our first quarter results demonstrate the continued momentum in our business, with robust exabyte growth and improved pricing driving another quarter of strong financial performance”

— Kris Sennesael, CFO of WD · SEC filing

From the company's earnings release filed with the SEC on 2026-10-22 (Form 8-K).

What would change the picture for WDC

These are the specific events and levels to watch. None of them is a prediction.

• The Jan. 27, 2027 earnings report is 88 days away. Western Digital Corp beat estimates in all 4 of the last 4 quarters, with an average surprise of +10.5%. A miss would break that pattern.
• Insider buying: none on the open market in 90 days. A purchase by an executive or director would be the first in at least three months. It would show up on SEC Form 4 within two business days.
• Analyst ratings: the average score moved from 4.1 to 4.0 over three months. The scale runs from 5 for strong buy to 1 for strong sell. A run of downgrades after earnings usually shows up here first.
• Price levels: a close above $746.0 would be a new 52-week high. That level is 103.8% above the latest close of $366.11. A close below $137.87 would be a new 52-week low, 62.3% below it.
• Growth: revenue rose 43.0% year over year in the quarter ending Oct 2026, a trend that is accelerating. At a P/E of 14.2, a slowdown would matter more than at a lower multiple.
• New shares: dilution risk is moderate now. A new shelf registration (S-3) or a prospectus supplement (424B) for an offering would raise it.

How WDC compares with its peers

Over the past month WDC ranks 2 of 3 in this group (-20.9%). The best was MU (-19.4%) and the weakest SNDK (-35.6%).

WDC's P/E of 14.2 is above the peers' median of 10.6. Investors pay more for each dollar of its profit, usually for faster expected growth.

WDC history: what happened after similar moves

Since 2023, WDC fell 20.9% or more in a month 4 times (separate episodes, not counting the current one). Three months later it was higher in 2 of 3 cases; the median change was +10.7%.

Past moves don't predict the next one; they show how volatile the stock has been.

Questions people also ask

What is WDC's 52-week high and low?

Over the past year WDC closed as high as $746.0 and as low as $137.87. At $366.11 on Oct. 30, 2026, it is down 50.9% from the high and 165.5% above the low. More →

Do analysts think WDC is a buy?

24 of the 31 analysts who cover Western Digital Corp rate it a buy or strong buy, for a consensus of Buy. Ratings describe analysts' views, not a guarantee, and they change after earnings. More →

Who is the largest shareholder of WDC?

Among investment managers that file Form 13F, BlackRock Inc. reported the largest WDC position at $21 billion. 1844 institutions reported holding WDC for Q2 2026. More →

Is Western Digital Corp issuing new shares?

Dilution risk reads moderate (40/100), and the share count rose 9.5% in a year. The rating comes from 3 offering-related filing(s) in 12 months.

Is Western Digital Corp profitable?

Yes. Western Digital Corp had $14.5 billion of revenue over the last 12 months. Its net margin was 69.2%, and its P/E was 14.2. More →

Does WDC pay a dividend?

Yes: $0.55 per share over the last 12 months, about 0.15% at today's price.

Dates to watch for WDC

Insider trades can come any day: they must be filed on Form 4 within two business days.

Key terms on this page

P/E ratio

Price divided by the last 12 months of earnings per share. A P/E of 20 means investors pay $20 for each $1 of yearly profit. It is only defined when the company is profitable.

Form 4

The SEC form a company's officers, directors and 10% owners must file within two business days of buying or selling its stock.

Open-market trade

A purchase or sale on the exchange at the market price, paid with the insider's own money (code P or S on Form 4), as opposed to option exercises, grants or gifts.

Form 13F

A quarterly SEC report listing the U.S. stock holdings of every investment manager with more than $100 million. It is due 45 days after each quarter ends, so it shows positions with a delay.

Dilution

When a company issues new shares, each existing share owns a smaller piece of the company. Common sources: stock offerings, convertible debt and large stock-based pay.

Form 8-K

The SEC form for material events between quarterly reports: earnings releases, deals, executive changes, stock offerings and similar news.

52-week high / low

The highest and lowest daily closing price over the past year (about 252 trading days).

Where these numbers come from

Every number on this page is computed from the data when the page is refreshed (usually daily); nothing is typed in by hand. This is information, not investment advice.

• Price: daily closing prices run through Oct. 30, 2026. Changes use 5, 21 and 63 trading days. The 52-week range uses the last 252 closes.
• Insider trades: SEC Form 4 filings for the last 90 days, counting only open-market purchases (code P) and sales (code S); option exercises, grants, gifts and filings with data errors are left out.
• Analyst ratings: counts of current ratings from 31 analysts, compared with three months ago.
• Earnings dates and estimates: a market-data calendar, with reported vs expected EPS for the last 4 quarters.
• Valuation and growth: revenue, earnings, margins and share counts come from the company's SEC filings (XBRL data, latest quarter Oct 2026). P/E and price/sales use the latest close.
• Fund ownership: SEC Form 13F filings for Q2 2026.
• Dilution: share-count changes and offering-related SEC filings (shelf registrations, prospectus supplements, convertible notes) over two years, scored 0-100.
• History: 21-trading-day moves over about three years of daily closes, counted once per episode.