Markets
Korea makes most of the high-bandwidth memory that sits next to AI GPUs. This door follows who gets paid when HBM is allocated, which step is stuck, and the dates that matter — in plain English. Education only, not investment advice.
Korea
Samsung earned a record ₩107.4 trillion in one quarter, mostly from memory prices rather than more chips. It has ₩198 trillion of net cash and a ₩84 trillion build plan, and says 2027 spending still won't lift 2028 output much. The stuck step is the clean room.
Korea
KEPCO's first technical review said no supply for 279 of 522 Seoul-area data centre requests. On 26 October the minister said AI data centre demand is smaller than planned. Sites next to power plants get paid first; the line into the capital is the stuck step.
Korea
SK hynix on 28 October printed ₩104.6 trillion of third-quarter sales and ₩83.3 trillion of operating profit, an 80% margin. Who gets paid is the memory maker on allocated HBM4. The stuck step is still those stacks.
Korea
Korea announced 13 fixes on 23 October to cut the waiting time in building chip fabs: permits run side by side, whole chip parks become one bonded zone. None of the 13 builds a power line, and a new 345 kV line still takes about nine years. That is the stuck step.
Korea
Korea Customs on 21 Oct: $27.516bn of chips in Oct 1–20, a mid-month record. Who gets paid is Samsung and SK hynix on boxes that already left. The stuck step is still new wafer output — daily chips cooled versus September.
Korea
Korea's memory makers just had their worst week since 2008. Its power gear makers spent the same week signing two-year deals with US Big Tech. Seven in ten big transformers Korea exports now go to America. The scarce thing is a factory slot.
Korea
Korea Customs on 15 Oct: $121.05B exports, $60.50B chips. ICT surplus $53.71B is larger than the whole surplus. Memory makers are paid; new wafer output still waits.
Korea
Korea's new AI data centres are being built far from Seoul, where the power is. A ₩600 billion deal just funded a 32 MW hall in Pohang, half of it pre-leased. Lenders and builders are paid first. The grid decides where the halls can go at all.
Korea
SK's chairman said on 9 October that SK hynix would build its next chip site fast, even before water and power are ready. At Yongin it has 3 of the 6 GW it needs. Memory makers are paid first, grid gear makers next. The stuck step is the power hookup.
Korea
Samsung guided ₩107.4 trillion of third-quarter operating profit on 8 Oct, its first quarter over ₩100 trillion. Memory makers get paid first; phone, PC and cloud buyers pay more. Profit is not cash yet, and new cleanroom space sets the pace.
Korea
Samsung’s 5 October filings to Thai Nguyen set a $3.9 billion memory-test plan. Who gets paid first is the builders, then Korean toolmakers. The stuck step is V1 live in Q4 2027 — a plan is not a tested chip.
Korea
Korea shipped $60.3 billion of chips in September 2026, up 262.8% on a year ago, and memory was about $54.1 billion of it. Memory makers get paid on chips that already left the country. The stuck step is new wafer output: tools are being bought, but they are not making wafers yet.
Korea is the AI memory door. Most of the high-bandwidth memory that sits next to an AI GPU is made by SK hynix and Samsung. Without that stack, a leading-edge die from Taiwan cannot become a finished accelerator.
Buyers are the same hyperscalers and neoclouds that book Taiwan packaging. Korea gets paid when HBM is allocated under long agreements, not when it is sold freely on a spot market. Pricing power shows up in memory makers' margins when supply stays tight.
Micron also makes HBM outside Korea; the Korea door still covers the largest share of AI-class output. For the layer map, read Semiconductors alongside HBM, explained.
As at September 2026, HBM remains allocated. Exports and supplier profits are high because the step is scarce, not because every buyer can get what they want.
| Step | Who | How they get paid | Status (Sep 2026) |
|---|---|---|---|
| HBM / advanced DRAM | SK hynix, Samsung (Micron smaller share) | Allocated under long-term agreements; high ASP vs commodity DRAM | Still stuck / allocated |
| Logic foundry (smaller) | Samsung Foundry | Wafer pricing; competes with TSMC on some nodes | Secondary to memory for this door |
| Packaging join | Mostly Taiwan CoWoS | See the Taiwan door | Still a finish-line gate |
| Chip exports | Korea exporters (memory-led) | Volume at elevated memory prices | Record (Aug 2026 ~US$46.7bn) |
Status is Second Order's read from SK hynix, Samsung, MOTIE and trade-press figures in the latest Korea Pulse.
| Name | What they do | Which step |
|---|---|---|
| SK hynix | Largest AI-class HBM supplier by many 2026 reads | HBM |
| Samsung Electronics (DS) | HBM and DRAM; foundry on the side | HBM / memory |
| Micron | Third HBM supplier (US-listed) | HBM |
Examples of exposure roles only — not recommendations.
| Date | Event | What to look for |
|---|---|---|
| Late Oct 2026 | SK hynix Q3 2026 results | HBM mix, margin, allocation comments |
| Late Oct 2026 | Samsung Q3 2026 results | DS memory profit; HBM capacity language |
| Monthly | Korea chip export prints | Whether memory-led exports stay elevated |
| Open | HBM4 qualification / customer mix | Whether next-gen supply stays under LTAs |
Korea makes most of the high-bandwidth memory that sits next to AI GPUs. Without that memory, leading-edge dies cannot ship as finished accelerators.
It means supply is booked under long agreements to a short customer list, not sold freely to whoever offers the highest spot price.
Korea supplies HBM; Taiwan does most leading-edge chipmaking and CoWoS packaging that joins the two. The stuck step can sit on either side.
No. This door maps who gets paid and which step is stuck. It is education only.
Updated 19 Sep 2026 · Next update after SK hynix and Samsung Q3 2026 results (late Oct 2026)
