I Keep Buying Seagate Because It Has One Massive Cost Advantage Others Don’t

I keep buying Seagate because every time I look at what it costs a hyperscaler to store a petabyte, the math ends at the same place, and my brokerage account ends at the same button. The core of my conviction rests on physics turned into a bill of materials. Seagate’s HAMR-based Mozaic platform lets it pack more terabytes onto the same platters, using roughly the same parts, and that is the cheapest way to hold the ocean of data the AI era keeps generating.

CEO Dave Mosley described the mechanics plainly on the March quarter call: “Mozaic 4 can deliver up to 44 terabytes per drive, over 30% more capacity compared to the first-generation Mozaic drives, which we achieved with the same number of disks and heads with minimal change to the bill of materials.” More capacity, same parts. That is a cost curve I want to own.

The Receipts Behind the Conviction

The financials are catching up to the technology. In fiscal Q3 2026, Seagate Technology (NASDAQ:STX | STX Price Prediction) posted revenue of $3.11 billion, up 44.07% year over year, non-GAAP EPS of $4.10, and non-GAAP gross margin of 47.0%, up from 36.2% a year earlier. Free cash flow reached $953 million versus $216 million in the prior year quarter. During the same three months the company retired $641 million of debt and returned $191 million to shareholders through dividends and buybacks.

Visibility is the second reason I keep adding. Mosley said “Our nearline exabyte production capacity is largely spoken for through the middle of next calendar year.” Management guided Q4 FY2026 revenue to $3.45 billion and non-GAAP EPS to $5.00 at the midpoint. The third reason is the dividend. Seagate pays a quarterly dividend of $0.74, most recently paid July 7, 2026, and it is now backed by real cash generation rather than balance sheet gymnastics.

Why Not Western Digital or Micron

The two names a reader would reach for first are Western Digital (NASDAQ:WDC) and Micron (NASDAQ:MU). I passed on both. Western Digital is the direct HDD peer, but Seagate got to volume HAMR first with Mozaic drives shipped for revenue to 75% of the leading global cloud customers in the March quarter. That head start on areal density shows up in Seagate’s 47% non-GAAP gross margin, a level WDC’s HDD unit has not matched. Micron sells flash, and flash still costs multiples per terabyte of what a Mozaic 4 platter costs. For nearline mass capacity, SSDs are the wrong tool at the wrong price. If storing agentic AI’s history is the job, HDDs win the economics, and Seagate builds the best of them.

The Risk I Am Not Ignoring

Insider activity has leaned toward net selling recently, with 243 recent insider transactions trending that way, and Seagate carries real cyclicality plus disclosed exposure to tariff and trade policy uncertainty and BIS settlement payments. I take that seriously. What keeps me buying anyway is the build-to-order book: capacity sold, pricing set, and mix locked in. Cyclicality bites hardest when supply outruns demand. Right now demand is outrunning supply.

Forward Conviction

Analyst consensus sits at $975.13 against a current price of $878.31, and the forward P/E is 37. Until someone matches Mozaic’s cost-per-terabyte, my capital keeps riding the toll road that AI’s data exhaust has to travel.

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