Key Highlights

  • Fiscal Q4 2026 Revenue rose about 48% to $3.629 billion, with non-GAAP gross Margin of 52.7% and non-GAAP EPS of $5.71.
  • Fiscal Q1 2027 guidance calls for revenue of $4.1 billion plus or minus $100 million and non-GAAP EPS of $7.30 plus or minus $0.20.
  • Management says nearline capacity is almost fully allocated through calendar 2027, backed by long-term build-to-order contracts with hyperscalers.
  • Shares rose 4.8% on September 22 to about $919.84, within a 52-week range of roughly $209 to $1,145, with a Wall Street consensus price target near $1,125.

Seagate Technology Holdings plc (NASDAQ:STX) says Demand for its high-capacity hard drives has run so far ahead of Supply that nearly all of its nearline capacity is already spoken for through calendar 2027. Chair and Chief Executive Dave Mosley said "nearline capacity is almost fully allocated through calendar 2027," a position the company has described consistently since its fiscal third-quarter report in April.

The reason is simple arithmetic. Hyperscale cloud operators building out artificial intelligence infrastructure need vast amounts of low-cost storage for Training data, model checkpoints and the content AI systems generate. Seagate has signed long-term build-to-order contracts with those customers that specify configurations and pricing through the end of fiscal 2027. That visibility gave management the confidence to guide fiscal first-quarter 2027 revenue to $4.1 billion, well above the prior quarter's record.

The stock continues to reflect that story. Seagate shares rose 4.8% on September 22 to about $919.84, within a 52-week range of roughly $209 to $1,145. No company-specific announcement accompanied the move, and its precise cause was not clearly identifiable.

Inside a Record Fiscal Fourth Quarter

Seagate reported results for the fiscal fourth quarter ended July 3, 2026, after the market closed on July 28. Revenue reached $3.629 billion, up from $2.444 billion a year earlier, an increase of roughly 48%. GAAP gross margin climbed to 52.3% from 37.4%, while non-GAAP gross margin rose to 52.7% from 37.9%. Non-GAAP Operating Margin was 44.6%, compared with 26.2% a year before.

Earnings expanded even faster. GAAP diluted Earnings per share were $5.58 and non-GAAP diluted EPS was $5.71, against $2.24 and $2.59 respectively in the prior-year quarter. Analysts had expected about $5.09 per share on $3.48 billion in revenue, so the company cleared consensus on both measures.

For the full fiscal year, revenue grew 34% to $12.195 billion and non-GAAP diluted EPS reached $15.58, up from $8.10. Cash Flow from operations was $3.7 billion and free cash flow hit a record $3.1 billion. Seagate retired $1.4 billion of Debt during the year, exiting with total debt of $3.6 billion and cash of $1.7 billion, and returned $810 million to shareholders through dividends and buybacks.

"Our performance is being driven by robust cloud Data Center demand and disciplined execution, and we see the momentum continuing in 2027," Mosley said in the company's release.

The Guidance Behind the Sold-Out Message

The company's fiscal first-quarter 2027 outlook calls for revenue of $4.1 billion, plus or minus $100 million, and non-GAAP diluted EPS of $7.30, plus or minus $0.20. At the midpoint, that would represent sequential revenue growth of about 13% and a further step up in per-share earnings from the $5.71 just reported.

Seagate said the guidance includes the estimated net dilutive impact of its exchangeable senior notes due 2028 and assumes minimal impact from global Tariff policies and the current conflict in the Middle East as of the date of the release. The board also declared a quarterly Dividend of $0.74 per share, payable October 7 to shareholders of record on September 24.

The capacity comment matters because hard-drive makers have historically been cyclical, with pricing collapsing when supply outran demand. Management's message is that contracted demand now underpins the next several quarters.

HAMR and the Mozaic Platform

The technology at the center of the story is heat-assisted magnetic recording, or HAMR, which Seagate sells under its Mozaic platform. HAMR uses a tiny laser to heat the disk surface briefly as data is written, allowing bits to be packed more densely and raising capacity per drive without adding more platters.

Mozaic 4+ completed customer qualification at two of the largest hyperscale cloud providers in March 2026 and entered Volume production. Higher areal density lets Seagate ship more exabytes per unit of Manufacturing capacity, which helps explain how gross margin moved above 50% even as the company kept Capital spending relatively restrained. Capital expenditures were $569 million in fiscal 2026, up from $265 million a year earlier.

"Seagate is well positioned to address strengthening exabyte demand through our Mozaic platform and differentiated HAMR technology roadmap," Mosley said in the release.

Where Seagate Sits in the AI Storage Stack

Mass-capacity hard drives still store the bulk of the world's cloud data because they remain far cheaper per terabyte than flash. Solid-state drives dominate latency-sensitive workloads, but the colder tiers that hold data lakes and archives rely heavily on nearline drives. Mosley pointed to about $1.1 trillion in remaining performance obligations held by the top three cloud providers as evidence of the scale of planned infrastructure spending.

Competition is not standing still. Western Digital (NASDAQ:WDC) is targeting 40TB drives in the second half of 2026 using its own energy-assisted recording approach, and Toshiba has announced plans for 40TB drives in 2027. The industry is effectively a three-player market, which has historically helped supply discipline, but any rival that closes the areal-density gap could pressure pricing.

Wall Street sentiment is largely positive, with a consensus price target of about $1,125 and most covering analysts rating the stock a buy.

The Risks Behind the Rally

The share price already embeds high expectations. The stock trades far above one fair-value estimate, and insiders have sold roughly $558 million of shares over the past year. A bear-case scenario puts Fair Value near $689, well below recent trading levels.

Customer concentration is another consideration. Much of the demand comes from a small number of hyperscale buyers whose capital budgets can change quickly if AI returns disappoint. A slowdown in data center spending, faster adoption of high-capacity flash in colder tiers or execution problems in HAMR ramp-up could weaken the outlook. Seagate also flagged tariff and trade uncertainty and its obligations under a settlement with the U.S. Commerce Department's Bureau of Industry and Security among its forward-looking risk factors.

Seagate's Next Supply Test

The near-term calendar begins with the dividend Record Date on September 24 and payment on October 7. The next major catalyst is Seagate's fiscal first-quarter 2027 report, which the company has not yet formally dated but which has historically arrived in late October.

Investors will be looking for revenue near the $4.1 billion guidance midpoint, any update on how much of calendar 2027 and 2028 capacity is committed, the pace of HAMR volume growth, and whether capital spending rises to add capacity. Comments from hyperscale customers on AI infrastructure budgets, and progress by Western Digital and Toshiba on competing high-capacity drives, will also shape whether the sold-out message translates into sustained earnings growth.