SK Hynix surges 7% as memory bid widens past NAND

A memory bid that began in NAND chips swept through the storage complex Friday, pushing SK Hynix up 7% and Seagate up 5% while the S&P 500 slipped. The Roundhill Memory ETF (CBOE:DRAM) climbed 5% to $59, while the SPDR S&P 500 ETF Trust fell 0.4% to $770 — a gap that turned a soft broad session into a clear sector event.

Seagate's fiscal Q4 revenue of $3.63 billion, up 48.5 percent year over year, reflected strong cloud data center demand and disciplined execution, Chief Executive Officer Dave Mosley said, with the company guiding fiscal Q1 2027 revenue to $4.1 billion, plus or minus $100 million.

SK Hynix, the market's default proxy for the high-bandwidth memory cycle, rose to $174.38 with no fresh company-specific headline. Its most recent preliminary report showed revenue of KRW 79.32 trillion, up 256.8 percent year over year, and operating profit of KRW 60.54 trillion, as HBM demand for AI infrastructure keeps delivering pricing power across DRAM and NAND. Western Digital climbed 4% to $461.02, rounding out the listed hard-drive exposure.

The divergence between the memory fund and the broad tape reads as a sector event across storage rather than two NAND names rising in tandem. SK Hynix sells the HBM and DRAM parts feeding AI accelerators directly; Seagate sells the cheaper mass-capacity hard drives holding the exabytes AI workloads generate. Western Digital CEO Irving Tan said on a recent call that roughly 80 percent of data stored in a hyperscale data center resides on hard drives.

Seagate Up 204% YTD as HDD Names Extend the Run

SK Hynix stock is up 22% over the past month, so Friday's surge extends existing momentum. Seagate entered the day off its recent highs, which explains part of the leverage on the intraday move. Seagate is up 204% year to date and Western Digital up 168%, extending a durable run into September.

The macro setup adds context. The Labor Department reported employers added 162,000 jobs in August against a forecast of 65,000, with unemployment holding at 4.1%. CME FedWatch showed expectations for a September rate hike rising to 60.2% from 49.4% Thursday. Memory is rallying into that headwind because its earnings have already landed — the kind of near-term cash generation that holds a bid when the discount rate moves against everything else.

Can the Bid Hold Past $58?

A cycle bid that broadens this fast can narrow just as fast, and none of the three companies announced anything Friday that changes their own fundamentals. Traders can watch whether the DRAM ETF holds above $58 into next week and whether HDD names sustain the bid through the next round of hyperscaler capex commentary. Position sizing matters more than conviction when a whole complex reprices in one afternoon.

This article is for informational purposes only and does not constitute investment advice.