DRAM Clears the Korea Rout as SK Hynix and Samsung Confirm Micron's $50B Guide

What Micron Actually Printed

After Tuesday's close, Micron put up the quarter the entire memory complex was waiting on. Revenue hit a record roughly $41.5 billion — about four times a year ago, adjusted EPS came in at $25.11 (a $4.62 beat), and gross margin printed a record 84.9%. The slides showed Q4 guided to $50 billion, plus or minus $1 billion, with margins headed toward ~86%.

The forward read is what moved the tape, not the backward beat. Management said HBM4 12-high is ramping twice as fast as HBM3E, flagged over $1 billion in HBM4 revenue already booked, and pointed to more than $22 billion of multi-year customer commitments with AI memory tight through at least 2027. Micron stock ran about 15% after hours. This is a duration call on the cycle, not a one-quarter pop.

Why a US Print Moves a Korean-Heavy ETF

DRAM is the Roundhill Memory ETF — roughly 12 holdings, memory-only, and its two largest positions are Samsung and SK Hynix, ahead of Micron, Kioxia, and SanDisk. When Micron reported after the US close, Seoul was shut, so the fund — and this perp — had to mark up its Korean names off Micron's read instead of off live prices.

Now those names are trading, and they're confirming it: SK Hynix +9.2% and Samsung +5.3%. That matters because SK Hynix sits on roughly 61% of the HBM market — the slice of memory that's hardest to second-source and where pricing holds firmest. The Korean tape is validating the markup, not fading it, which is the difference between a guess that gets reversed at the open and a move that sticks.

From Round-Trip to Re-Rate

Two sessions ago DRAM took a 14.25% hit on a Kospi-led memory selloff. The perp hasn't just erased that — at $77.53, +13.93% on the session, it's through the pre-rout high. The earlier recovery was mean-reversion into the print; this leg is the print itself reframing the trade.

The risk is the mirror image of the setup. This is a highly concentrated, memory-only basket, and the sector has a long history of boom and bust. The same leverage to Samsung, SK Hynix, and Micron that's marking the fund up today is exactly what crushed it on Tuesday. If AI capex or memory pricing rolls, there's nothing in the wrapper to cushion it — but for now Micron's guide is the strongest argument yet that the roll isn't close.