Seagate Technology (STX) is on another tear. The stock jumped 11% today on third-quarter results, adding about $15 billion in market value, and is now up roughly 130% this year alone.
Investors are starting to price in a much bigger shift, where Seagate plays a direct role in AI infrastructure buildouts.
Hyperscalers are buying massive amounts of high-capacity storage, margins are expanding as the revenue mix improves, and the company just cleared a major overhang with its next-generation HAMR technology. Here’s what’s driving Seagate’s latest move higher.
AI nearline demand is reshaping Seagate’s cycle
Seagate Technology is no longer being driven by the old PC and enterprise replacement cycle. The business is now tied much more directly to AI infrastructure buildouts, where hyperscalers are buying massive amounts of high-capacity storage to support data-heavy workloads.
Seagate’s third-quarter results showed this. Revenue came in at $3.1 billion and non-GAAP EPS at $4.10, delivering beats on both fronts. For fiscal Q4, the company guided to $3.45 billion in revenue, plus or minus $100 million, and $5 in EPS, plus or minus $0.20.
Seagate is putting up numbers that reflect sustained demand from hyperscalers and enterprises buying high-capacity nearline drives for AI workloads. Management said “the data center market accounted for 88% of exabyte shipments and 80% of revenue,” confirming that the business now leans heavily toward its highest-value end market.
A big surprise from this quarter was that Seagate raised its medium-term revenue growth target to “a minimum of 20% over the next few years,” up from previous guidance of low to mid-teens annual revenue growth. This underscores that management sees this trend as more than a cyclical upturn.
That changes the company’s earnings model. Seagate now serves customers who plan storage capacity over multi-year roadmaps tied to cloud and AI buildouts, which supports stronger visibility and more stable demand.
Management reinforced that view on the earnings call, stating the company is “entering a period of structural growth,” while nearline capacity is “almost fully allocated through calendar 2027.” Tight supply in Seagate’s most valuable category supports pricing and strengthens margin durability.
The key focus now is whether data center demand stays near current levels and continues to support pricing and margin strength, which would establish a higher and more durable earnings base
Seagate’s improving margin quality
Margins are where the shift to servicing more AI infrastructure buildout is really showing up. Non-GAAP gross margin reached 47%, and non-GAAP operating margin climbed to 37.5%. Those are far above what investors typically assign to a commodity-like HDD supplier.
High-capacity nearline drives, which are large, low-cost hard drives used in data centers to store massive amounts of AI and cloud data, carry better pricing and stronger economics and now make up the bulk of shipments. As volumes scale in these products, fixed costs are spread more efficiently and incremental profit expands quickly.
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That matters because margins are increasingly being driven by product mix and market position.
Management’s pricing discipline and the cost-per-terabyte advantage of HDDs support that view.
HAMR is now moving from concept to deployment, with major cloud providers validating Seagate’s next-generation storage technology.
HAMR qualification clears a key overhang
Seagate also cleared one of the market’s biggest execution questions. Two of the world’s largest cloud service providers have now qualified the company’s Mozaic 4+ HAMR platform, showing the maturity of the technology.
That matters because HAMR, short for heat-assisted magnetic recording, is Seagate’s next-generation technology that increases the amount of data each hard drive can store. Its Mozaic 4+ platform is the company’s first major commercial rollout of that technology, designed for high-capacity drives used in large-scale data centers
HAMR had long been treated as a roadmap promise rather than a commercial reality, and that’s starting to change. Hyperscalers are buying the most efficient storage available at scale, and HAMR positions Seagate in that conversation.
With two major cloud customers already qualified, the risk of missing the next capacity transition has fallen sharply.
Seagate’s up over 600% in the past year. Here’s what can send it higher:
- Tight nearline supply into 2027 supports pricing and strong revenue visibility
- Data center mix near 80% keeps margins elevated and mix premium
- Sustained gross margin near 47% drives stronger EPS and multiple expansion
- Mozaic HAMR adoption lifts revenue per drive and reinforces tech leadership
- 20%+ growth outlook forces estimate revisions higher
What could crush Seagate’s bull case
- HAMR qualification fails to translate into broad volume ramps
- Customer concentration increases exposure to hyperscaler order swings
- Mix shift away from premium nearline drives pressures pricing and margins
- Industry capacity adds loosen supply and erode favorable pricing
- HAMR yield or manufacturing issues raise costs and delay shipments
Key takeaways for Seagate Technology
Seagate now operates as a storage supplier leveraged to AI infrastructure, with stronger margins, better visibility, and a credible next-generation roadmap.
The valuation now depends on execution. Seagate must hold its data center mix, sustain margins, and scale HAMR deployments to earn a higher-quality multiple. Investors will track three signals: data center demand, margin durability, and HAMR ramp.