STX vs WDC: Which Is the Better Buy in 2026?
Last updated August 2026
Short answer
STX and WDC are similarly sized, but STX trades noticeably cheaper on forward earnings (15.65x vs 29.06x): the market is paying up for WDC's profile and pricing STX more conservatively, or for faster growth. Which you prefer comes down to the drivers you believe, and whether adding either over-concentrates what you already own.
STX vs WDC: the tie-breaker metrics
Same yardstick, side by side (as of August 2026). Valuation lined up like this is most meaningful for two names in the same corner of the market, which these are. Figures are approximate; verify before investing.
| Metric | STX | WDC | What it tells you |
|---|---|---|---|
| Forward P/E | 15.65 | 29.06 | Valuation on next year's expected earnings, the same yardstick for both. Lower is cheaper for that growth; higher means the market is paying up. |
| Trailing P/E | 61.73 | 32.57 | Valuation on the last 12 months. A big drop from trailing to forward means the market expects earnings to jump, so more growth is already in the price. |
| Beta | 2.07 | 2.17 | Volatility vs the market. Above 1 swings harder than the index; below 1 is steadier. Higher beta means bigger drawdowns to hold through. |
| Price vs 52-week range | 71% of range | 65% of range | Where today's price sits between the 52-week low and high. Near the high is momentum with less margin of safety; near the low is out of favor or a discount, depending on why. |
Reading it: STX is the cheaper of the two on forward earnings, but cheaper is not the same as better. Pair the valuation with growth (how far the forward P/E sits below the trailing P/E) and risk (beta) before you decide.
Before you buy: how STX and WDC affect your concentration
The metrics above tell you which is the marginally better business. The bigger risk for most people is not picking the slightly worse stock, it is over-concentrating. STX and WDC share themes, so owning both, or adding either to what you already hold, can quietly push a large share of your portfolio into one bet.
This is the part a generic comparison page cannot answer, because it depends on what you own. Connect your brokerage and Walnut shows your real, combined STX and WDC exposure, flags overlap with your existing positions, and tells you if adding one would tip you past a concentration you are comfortable with, read-only by default, with your login staying at your broker. Walnut is not an investment adviser.
What does Seagate Technology (STX) do?
Seagate Technology is one of the two major hard disk drive (HDD) manufacturers in the world, alongside Western Digital. Most Seagate revenue comes from high-capacity nearline HDDs sold to hyperscale cloud providers (Microsoft Azure, Amazon AWS, Google Cloud, Meta, Oracle) for cold and warm storage. The company has been transitioning its HDD product portfolio to higher capacities using HAMR (heat-assisted magnetic recording) technology, allowing single drives to hold 30TB+ and reach 40TB+ in development.
What does Western Digital Corporation (WDC) do?
Western Digital Corporation is one of the two dominant makers of hard disk drives, the spinning-platter storage that underpins the world's cloud and enterprise data centers. In February 2025 the company completed a major separation, spinning off its NAND flash and SSD operations into a standalone public company called Sandisk. What remains under the Western Digital name is a pure-play HDD business, and by February 2026 it had fully liquidated the minority Sandisk stake it briefly retained, raising about $3.1 billion and cutting debt in the process.
STX vs WDC: how do they differ?
Both fit overlapping themes, but they are not interchangeable. The useful comparison is which set of drivers and risks you want exposure to.
- STX drivers: AI-driven nearline storage demand; HAMR ramp.
- WDC drivers: AI and cloud storage demand; Post-spinoff focus and cleaner balance sheet.
Which fits which kind of investor
A faster-growing, richer-valued name usually swings harder, so it suits a longer horizon and a higher tolerance for volatility; a steadier, more cash-generative business suits a more conservative or income-minded investor. The honest test is which set of risks you could hold through a drawdown: SSD price declines could eventually erode HDD's per-terabyte cost advantage. For WDC, the central risk is that HDDs remain a cyclical, commodity-like hardware business: storage demand and pricing can swing sharply, and past cycles have seen gluts crush margins even for the market leaders.
STX or WDC: which should you pick?
STX vs WDC: the full fundamentals
STX. Seagate's valuation is supported by the HDD duopoly with Western Digital and the supply discipline that has held through the recent cycle. The dividend yield is attractive; the multiple compresses if SSD pricing improves enough to threaten HDD's per-terabyte cost advantage.
WDC. Figures are approximate and tied to the asOf date; verify live numbers before acting. As a cyclical hardware supplier, Western Digital's earnings and multiple can look very different at the top versus the bottom of a storage cycle, so where HDD pricing and hyperscaler demand sit matters more than any single trailing multiple. Compare it directly to Seagate, its closest peer, since the two move on the same industry dynamics.
Headline figures (approximate, early 2026): STX shows revenue (ttm) ~$8 billion (recovering), operating margin ~20% (cyclical), net income (ttm) ~$1.2 billion, eps (ttm) ~$5.50; WDC shows business profile Pure-play HDD maker after the Feb 2025 Sandisk spin-off (approximate; verify live), revenue mix Overwhelmingly hyperscaler and cloud data center demand; minimal consumer (approximate; verify live), market position One of two dominant HDD makers with Seagate; together the large majority of the market (approximate; verify live), 2026 capacity Reported largely sold out to AI data centers, with improving pricing power (approximate; verify live).
The bottom line: STX vs WDC
STX and WDC are related but distinct: same themes, different businesses and risks. Neither wins in the abstract; the right pick is whichever thesis you actually believe, sized so you are not over-concentrated in one theme. Walnut can show your combined STX and WDC exposure against your real portfolio. It is not an investment adviser.
Wondering how STX or WDC fits the portfolio you already own? Walnut is an AI investing app that connects your brokerage read-only and answers questions like that about your actual holdings: overlap, concentration, and how each position tracks the S&P 500. Compare the best AI portfolio analyzers or see the best AI investing apps in 2026.
Investing in Seagate Technology with AI
Connect the broker you already use and ask Walnut's AI how STX fits what you actually hold: whether you own it already through a fund, what it would do to your concentration, and how it has tracked the S&P 500. Read-only by default, and you approve anything before it reaches your broker.
FAQ
What is the difference between STX and WDC?
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Seagate Technology is one of the two major hard disk drive (HDD) manufacturers in the world, alongside Western Digital. Western Digital Corporation is one of the two dominant makers of hard disk drives, the spinning-platter storage that underpins the world's cloud and enterprise data centers. They show up together because they share investment themes, but they are different businesses, so the better fit depends on which thesis you are expressing.
Is STX or WDC the better stock?
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Neither is universally better; they suit different views and risk levels. Walnut is informational, not investment advice. Compare what each does, the tie-breaker metrics above, and the risks, then decide which fits your thesis and what you already own.
Which is cheaper, STX or WDC?
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On forward P/E (as of August 2026), STX trades at 15.65x and WDC at 29.06x, so STX is the cheaper of the two on next year's expected earnings. A lower multiple is not automatically the better buy: a richer valuation can be justified by faster growth, and a lower one can reflect real risk. Weigh the multiple against how fast each business is compounding.
Should you own both STX and WDC?
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Because they share themes, owning both concentrates you in that theme. That can be intentional (a focused bet) or accidental (less diversification than it looks). Walnut can show your combined exposure across both, and whether adding either over-concentrates you, before you buy.
What are the risks of STX vs WDC?
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STX: SSD price declines could eventually erode HDD's per-terabyte cost advantage. HDD demand outside of nearline (PCs, consumer NAS) continues to decline secularly. HAMR yield ramps must execute cleanly. WDC: The central risk is that HDDs remain a cyclical, commodity-like hardware business: storage demand and pricing can swing sharply, and past cycles have seen gluts crush margins even for the market leaders. Western Digital is heavily concentrated in a handful of hyperscale customers, so a pause in cloud or AI capital spending would hit it quickly. Technology transitions are a structural risk: executing the shift to higher-capacity recording formats like HAMR is expensive and stumbles can cede share to Seagate. There is also long-run substitution risk from flash and SSDs, though hard drives remain far cheaper per terabyte for mass storage today. Finally, the company competes in a near-duopoly where pricing discipline is not guaranteed, and any renewed capacity race would pressure profitability across the industry.
Walnut is informational, not investment advice. This page is descriptive and not a recommendation to buy or sell STX or WDC; figures are approximate and dated (as of August 2026). Verify current data before investing.