Storage Stocks Slide as Profit Taking Follows Big Run: Seagate Falls 4%, SanDisk Drops 3%, Micron Holds Flat

David Moadel

Fri, September 11, 2026 at 9:05 PM GMT+3 5 min read

Quick Read

Seagate (STX) sheds 4% and SanDisk (SNDK) drops 3% on no news, surrendering small pieces of their massive 2024 runs.
The Roundhill Memory ETF (DRAM) and SPY both gain 1% Friday, confirming the selling is name-specific profit taking, not a sector retreat.
Micron (MU) holds nearly flat as its heavy DRAM exposure to AI servers keeps it insulated while storage peers sell off.
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Seagate Technology Holdings (NASDAQ:STX) stock is down 4% to $827.88 in Friday afternoon trading, giving back a slice of a run that has tripled the shares this year. The move arrives without a company announcement, a guidance change or an analyst rating action attached to it, which points to profit taking after an outsized advance. Seagate shares are up 201% year to date.

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Meanwhile, SanDisk (NASDAQ:SNDK) stock is falling 3% to $1,635.85, also with no fresh release to explain the slide. SanDisk has climbed 29% over the past month, so Friday's pullback lands on shares that had been on a sharp, unbroken advance.

Micron Technology (NASDAQ:MU) stock is holding its ground, up 0.2% to $979.17. The Roundhill Memory ETF (CBOE:DRAM) is up 1% in the same session. The SPDR S&P 500 ETF Trust (NYSEARCA:SPY) is up 1%, so the broader market is rising even as STX and SNDK fall.

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Profit Takers Target Two Memory Stocks

A review across financial wires turned up no same-day company announcement, guidance revision, pricing item, regulatory decision or analyst rating change from Seagate that would justify a session move of this size. The same holds for SanDisk, which has no fresh release or research note attached to Friday's slide. That absence of a trigger is itself the story, because a stock carrying a run this large can shed a few percentage points on any quiet day as holders lock in gains.

The Roundhill Memory ETF rising in the same session in which Seagate and SanDisk fall is the fact that settles what this is. The fund's advance alongside those two declines points to name-level selling that looks like portfolio housekeeping on a quiet news day for both companies.

Why Micron Is Holding Up

Micron's business is weighted toward the dynamic random access memory (DRAM) used in artificial intelligence servers, which is the corner of memory that has been bid up hardest as hyperscalers scale out AI training and inference. Seagate makes hard disk drives and SanDisk makes flash memory, so both sit on different rungs of the storage stack from Micron's DRAM-heavy mix.

The steadiness in Micron stock while STX and SNDK drop provides a major clue for investors. If holders were rotating out of memory as a broad theme, Micron shares would be moving with the group. That the most AI-exposed name in the trio is holding says the selling in Seagate and SanDisk reflects their own runs, with the AI-memory trade still intact underneath.

What to Watch

For Seagate stock, the risk worth naming is that a stock up this much for the year has further to fall on any given day than the size of the news would suggest. The same holders who rode Seagate shares higher can trim without needing a headline to justify it. SanDisk stock carries the same shape at a shorter horizon, with a month-long advance close to a third that can give back a few percentage points on nothing more than sellers finding the exit together.

Investors sizing their exposure to Seagate and SanDisk shares may want to keep an eye on whether either name gives back more of its run before the closing bell, and whether the DRAM memory ETF's advance holds up alongside those declines. Micron stock's steadiness on a day of storage weakness is itself the read here, and position sizing on names carrying moves this size should stay conservative.

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