Seagate (STX) Q1 FY27: revenue +61% to $4.23B, the HDD leg of the memory thesis holds

$STX printed $4.23B of revenue for its fiscal first quarter, up 61% from a year ago, with a 57.8% non-GAAP gross margin and $7.68 of non-GAAP EPS. Both lines landed above the top of the range Seagate gave in July ($4.1B ±$100M and $7.30 ±$0.20), and the next-quarter guide steps up again to $4.8B and $9.20. For the DRAM / HBM Memory bubble, the hard-drive leg did exactly what the thesis says it should: more revenue on rationed supply, at margins far above last year's. This recap walks the numbers, the read-through to the bubble, the peers and what to watch into the January print.

The print

$STX reported the quarter ended October 2, 2026. Every headline line beat the company's own guide.

Revenue grew 61% year over year and 17% sequentially. Non-GAAP gross margin added 1,770 basis points in a year and 510 basis points in a quarter. Non-GAAP net income was $1.78B, against $583M a year earlier. GAAP and non-GAAP are close this quarter: GAAP gross margin 57.3%, GAAP net income $1.76B.

Cash and the balance sheet:

• Cash flow from operations: $1.7B. Free cash flow: $1.5B, which the CEO called the highest ever for a September quarter.
• Debt: about $1.2B of principal retired in the quarter, taking gross debt to $2.4B. After quarter end, another $750M was retired, bringing gross debt to $1.6B.
• Shareholder returns: $568M through dividends and buybacks. The quarterly dividend rises about 3% to $0.76, payable January 7, 2027 to holders of record on December 23, 2026.
• Share count: 230M ordinary shares outstanding; cash and equivalents $1.3B.

Guidance for the fiscal second quarter, verbatim from the release:

At the midpoint that is another 13% sequential step in revenue and 20% in EPS. The EPS guide excludes about $0.30 per share of share-based compensation.

Not disclosed in the release: revenue by market, exabytes shipped and the HAMR (Mozaic) share of the mix. Seagate puts those in a separate Supplemental Financial Information document on its investor site.

DRAM / HBM Memory read-through

The QA thesis on /stocks/stx frames mass-capacity hard drives as the AI cold-storage layer: flash takes the hot tier, and the petabytes of training sets, checkpoints and logs that have to be kept cheaply land on drives. Two companies make those drives at scale, $STX and $WDC, and supply has been rationed rather than chased.

This print is that thesis in numbers. Revenue up 61% while gross margin goes from 40% to 58% is what happens when demand grows faster than an industry chooses to add capacity. Chair and CEO Dave Mosley tied it to the same mechanics in the release: "long term customer demand visibility" supporting "a multi-year growth phase", with the HAMR roadmap meeting exabyte demand "through areal density gains while maintaining supply discipline", and a "value-based pricing strategy". Areal density is the lever: more terabytes per platter means more capacity sold without building more factories, which is why the margin keeps rising with volume.

For the DRAM / HBM Memory bubble, the read is that the storage tier is still participating in the same tight-supply setup as the DRAM and HBM makers, one layer down the stack. The print confirms the thesis on demand, pricing and balance sheet. It does not test the bear leg, which is about how cyclical these margins turn out to be. The evergreen version of the company story is in Seagate (STX): what it does, how it makes money, and why AI still runs on hard drives.

Peer reaction

Seagate reported after the close, so the session moves below are from the day before the print, not a reaction to it. The after-hours response was not yet established when this was written.

• $WDC (0.88 correlation, the other half of the HDD duopoly) closed at $380.88 on October 27, up 6.9% on the day. Its own fiscal Q1 print is next; the WDC Q4 recap flagged the HAMR shipping gap versus Seagate as the stock's main bear leg.
• $SNDK (0.69, NAND flash) closed at $1,304.84, up 3.9%.
• $MU (0.64, the DRAM and HBM anchor of the bubble) closed at $928.76, up 2.8%.

STX itself closed at $667.85, up 3.7% on the session. It is also a 4.19% holding of the Roundhill Memory ETF, DRAM, whose top three positions are Micron, Samsung and SK Hynix.

What worked

• Above the top of the guide on both lines. $4.23B against a $4.2B ceiling and $7.68 against a $7.50 ceiling.
• Margin expansion with volume. 57.8% non-GAAP gross margin, up 510 basis points in one quarter. Rising margin on rising revenue is the pricing-discipline signal the thesis rests on.
• Cash conversion. $1.5B of free cash flow on $4.23B of revenue, a 35% free-cash-flow margin in a business long modeled through the cycle at single digits.
• Balance sheet repair. Gross debt went from about $3.6B to $1.6B within the quarter and the weeks after it, while the dividend still rose.
• A higher bar for next quarter. The $4.8B and $9.20 guide sets another sequential step up, on the company's own numbers.

What broke

• Little, on the numbers themselves. The release has no miss to point to. The risks are about durability, not this quarter.
• Peak-cycle margins. A 58% gross margin compares with 46.1% for fiscal 2026 as a whole and 40.1% a year ago. Storage has a long history of cycles, and nothing in a single quarter settles how far margins fall when hyperscaler capex pauses. The framework is in Memory cyclicality: the supercycle that still has a cycle.
• Mix not visible in the release. Without exabytes, market revenue or the HAMR share in the press release, the growth cannot be split between volume, price and product mix from this document alone.
• The tape and the fundamentals have diverged. The stock is 199% above its close a year ago ($223.00), but 39% under its $1,094.04 closing high of June 22, and below its 50-day ($809.96) and 200-day ($687.14) averages at the October 27 close. Record earnings did not stop that drawdown, which says the market is already debating the cycle, not the quarter.
• Policy and trade exposure. The release's cautionary note names tariff and trade-policy uncertainty, and the quarterly payments under Seagate's settlement with the US Commerce Department's Bureau of Industry and Security.

What to watch

• The call and the supplemental deck. Exabytes shipped, the HAMR share of mass-capacity revenue and any change in how far out customers commit volume are the data this recap does not have yet.
• Next earnings. Q2 FY27, late January 2027 on Seagate's usual cadence (date not yet announced). The bar: $4.8B ±$100M of revenue and $9.20 ±$0.20 of non-GAAP EPS.
• The duopoly read. $WDC's fiscal Q1 print is the other half of the HDD pricing picture. If both report rising margins on rising volume, the supply-discipline leg holds for the industry, not just one company.
• Levels on the chart. The auto-computed 0.5 retracement of the 52-week leg sits near $681, just above the October 27 close, with the 0.618 near $572. These are computed levels, not curated ones, and they move with each refresh.
• Hyperscaler capex commentary. The next round of cloud earnings re-anchors the cold-storage demand curve this guide is built on.

The full Seagate dossier (business, last quarter, bear case, levels) is at /shop/stx-dossier. To trade $STX or $WDC from a US-retail or LLC account, see /stack/ibkr. Bubble shifts and rule-based alerts on the storage and memory cohort are part of /pro.

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Bubble context: /bubbles/memory: the cluster this name belongs to and how it's moving.

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