Seagate Technology Holdings plc (STX): Who It Depends On
Seagate is one of two companies left making hard disk drives at scale, and its business has flipped from PCs to the cloud: roughly three-quarters of its revenue now comes from mass-capacity nearline drives sold into hyperscale data centers, with legacy PC, consumer and edge products making up the rest. On the supply side, Seagate is unusually vertically integrated, building most of its own recording heads and media in-house, but it still leans on a small set of specialist Japanese suppliers for glass substrates, spindle motors and HAMR media, plus merchant chipmakers for the controller silicon on its drives. On the customer side, its fate is increasingly tied to a handful of giant cloud buyers whose AI-driven data-center buildouts now set the pace of Seagate's order book.
Supply-chain dependency
Seagate discloses that it designs and manufactures a significant share of the components it considers most critical, including read/write heads and recording media, in-house, while sourcing glass and aluminum substrates, spindle motors and controller chips from outside vendors. The mix below blends that internal production with the external suppliers Seagate and industry reporting describe, to illustrate overall reliance rather than an official cost breakdown.
Not a single company. Seagate builds a large share of its own recording heads and magnetic media rather than buying them from outside vendors, including through its own wafer fabrication facility in Springtown, Northern Ireland, which produces a substantial portion of the world's HDD heads.
Seagate's hard drives typically run controller and preamplifier silicon from Broadcom, one of a small number of merchant chipmakers that design the standard and custom ASICs used on Seagate's drive circuit boards.
Japan's Nidec is the dominant global supplier of spindle motors for hard disk drives, and Seagate purchases spindle motors from outside vendors rather than making them itself. Nidec trades primarily on the Tokyo Stock Exchange and only as a thin, lightly traded over-the-counter ADR in the US, with no proper US-listed ticker.
Hoya is a leading maker of glass substrates used in hard drive platters, including the glass media adopted for Seagate's newer HAMR drives; Seagate buys all of its glass substrates from third parties. Hoya trades primarily on the Tokyo Stock Exchange and only as a thin, lightly traded over-the-counter ADR in the US, with no proper US-listed ticker.
Resonac has partnered with Seagate since 2021 to jointly develop the heat-assisted magnetic recording (HAMR) media used in Seagate's newest high-capacity drives, supplementing Seagate's internal media production. Resonac trades primarily on the Tokyo Stock Exchange and only as a thin, lightly traded over-the-counter ADR in the US, with no proper US-listed ticker.
Through its SAE Magnetics subsidiary, TDK has long supplied recording heads to hard drive makers, supplementing the heads Seagate produces at its own Northern Ireland fab. TDK trades primarily on the Tokyo Stock Exchange and only as a thin, lightly traded over-the-counter ADR in the US, with no proper US-listed ticker.
Not a single company. Seagate outsources assembly of the printed circuit boards used in its disk drives, SSDs and storage subsystems to third-party electronics manufacturers across Asia rather than building them in-house.
Not a single company. Seagate sources aluminum disk substrates and other specialty media inputs from a limited pool of outside vendors that supply the wider hard drive industry, alongside its own internal media manufacturing.
Customer concentration
Seagate does not publicly break out revenue by individual hyperscale customer today. Its 10-K historically named a single 10%-plus customer (Dell, in fiscal 2016 and 2017) but has not named one since; the cloud buyer split below reflects industry and analyst reporting on the largest purchasers of Seagate's mass-capacity nearline drives, not a company-disclosed figure.
AWS is widely reported as one of Seagate's largest buyers of mass-capacity nearline drives for cloud data centers, and Seagate markets dedicated storage solutions to AWS through its enterprise partner program.
Microsoft's Azure cloud build-out is one of the largest sources of demand for Seagate's high-capacity Exos and HAMR-based Mozaic nearline drives, which hyperscale operators buy in bulk to expand storage capacity for cloud and AI workloads.
Google Cloud is among the hyperscale operators reported to be qualifying and purchasing Seagate's latest high-capacity HAMR drives as it expands its own data center storage footprint.
Meta's data centers, which store enormous volumes of user and AI training data, are a significant outlet for Seagate's nearline hard drives as the company scales capacity for both social platforms and AI infrastructure.
Not a single company. Additional cloud service providers and enterprise storage system builders round out Seagate's data-center customer base, which now accounts for roughly three-quarters of company revenue.
Dell has historically been one of Seagate's largest single customers, once accounting for around 10-12% of Seagate's consolidated revenue in older fiscal years, and remains a major channel for drives sold into PCs and enterprise servers.
Not a single company. Seagate sells a meaningful share of its drives through independent electronics and IT distributors, who resell to smaller resellers, systems integrators and retailers worldwide.
Not a single company. Branded external drives, NAS drives and gaming storage sold through retail and e-commerce outlets make up a smaller but still notable slice of Seagate's revenue outside the data center.
The percentages shown are editorial estimates based on public research (company disclosures, earnings commentary, and industry reporting) meant to illustrate relative reliance, not precise or audited figures. Companies without a proper, reliably tradable ticker on this site are shown without stock/earnings links. This is not financial advice.
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