AI storage demand is lifting Seagate to record margins
- Data Center represented 89 percent of shipped exabytes in the June 2026 quarter.
- Seagate shipped 218 exabytes in the June 2026 quarter, up 34 percent from the prior year.
- Fiscal year 2026 revenue reached $12.2 billion with net income of $3.2 billion.
- Nearline drive capacity is largely allocated into calendar 2028, locking in future revenue.
- Gross margin hit 52.7 percent in the fourth quarter, driven by strong pricing power.
AI gives hard drives a second wind
Seagate is in a much better cycle than a normal hard drive company. Cloud customers need huge amounts of storage for AI training, physical AI, and caches. That demand pushed fiscal year 2026 revenue to $12.2 billion and fourth-quarter gross margin to 52.7 percent.
The bull case rests on visibility. Management said nearline capacity is largely allocated into calendar 2028 based on long-term supply agreements. In plain English, big customers are reserving drive supply years before it is made. That secures price, factory use, and cash flow.
The technology story also matters. Seagate uses a heat-assisted magnetic recording platform called Mozaic to fit more data on each disk. Mozaic 4 is now ramping with two of the largest global cloud service providers. Mozaic 5 is the next key step for late calendar 2027.
The bear case is still present. This is a hardware business tied to a few very large cloud buyers. If AI data center builds slow after the current contract window, or if the Mozaic 5 ramp slips, today's peak margins could eventually revert to historical averages.
Big drives, big customers, big swings
Seagate makes money by selling storage hardware. Its main product is the hard disk drive, or HDD. Most growth now comes from high-capacity nearline HDDs, which are drives built for cloud data centers that store huge amounts of data at lower cost than flash memory.
The company sells mostly through original equipment manufacturers and large cloud buyers, plus distributors and retailers. Data Center demand now heavily dominates the business, representing 89 percent of exabyte volume in the latest quarter. That shows how important large enterprise and cloud orders are.
Seagate is vertically integrated. It designs and makes key parts like read and write heads and recording media. This can lower cost when factories are full, but it can hurt profit when demand falls because fixed factory costs do not shrink quickly.
The model struggles if pricing turns down, if cloud customers delay purchases, or if Seagate is late with higher-capacity drives. The current cycle is exceptionally strong, but the stock still requires investors to believe that AI storage demand lasts well beyond 2028.
What Seagate sells
Mass Capacity nearline HDDs
These are high-capacity hard drives sold to cloud and enterprise data centers. They are the center of the AI storage thesis.
Mozaic HAMR drives
Mozaic is Seagate's platform that uses heat to pack more data onto each disk. Mozaic 4 is ramping, while Mozaic 5 is the next major technology test.
Enterprise systems and storage arrays
Seagate sells modular storage systems and server platforms for customers that want more than standalone drives. These products support the data center focus.
Edge IoT, NAS, and video drives
These drives serve network storage, video, image, and edge devices outside the largest cloud data centers. They are smaller than the core Data Center business.
Consumer and client storage
This includes external drives and branded products such as Seagate Ultra Touch, One Touch, and LaCie. It is no longer the main growth story.
Lyve platform
Lyve is an as-a-service platform for moving and managing large data sets across on-site and cloud storage. It gives Seagate a services option around its hardware base.
Almost entirely data center
Mix is based on Seagate's June 2026 quarter exabyte shipment volume. The shift toward Data Center raises both growth potential and customer concentration risk.
What could break the thesis
Cloud order pushouts
High impact · Medium oddsSeagate depends on large cloud and hyperscale buyers. Capacity is largely committed into calendar 2028, but the risk moves to what happens after that window. A delay in AI data center builds could hit revenue, price, and factory use.
Mozaic ramp miss
High impact · Medium oddsHigher-capacity drives are central to Seagate's cost and margin story. Mozaic 4 needs to finish its ramp through calendar 2026. Mozaic 5, targeted for 50 terabyte drives, is the later milestone that protects the lead.
Pricing turns against Seagate
High impact · Medium oddsThe hard drive industry has a long history of price erosion. Recent margin gains came from pricing actions, volume, and product mix. If supply catches up or customers regain bargaining power, gross margin could fall.
Factory underuse
Medium impact · Low oddsSeagate's factories carry high fixed costs because the company makes many key parts itself. That works well when demand is high. If demand falls, the same setup can create underuse charges and lower profit.
Tax and debt drag
Medium impact · Medium oddsSeagate is reducing debt, but interest expense remains a real cost. The OECD Pillar Two global minimum tax is also expected to raise income taxes. These items can limit how much operating strength turns into earnings per share.
In one breath
Why does AI help Seagate?
AI creates and uses huge amounts of data. Much of that data needs cheap, dense storage, which is where high-capacity hard drives still matter.
Is Seagate a semiconductor company?
Not in the usual chipmaker sense. Seagate is a storage hardware company that designs and makes hard drives, key drive components, storage systems, and related data platforms.
What is Mozaic?
Mozaic is Seagate's HAMR-based drive platform. HAMR means heat-assisted magnetic recording, a method that helps store more data on each disk.
What is the main risk for STX investors?
The main risk is that cloud customers slow or delay storage purchases after the current contract period. A second major risk is that Seagate misses the ramp of its next higher-capacity drive platforms.
