Silicon Peninsula #006 — Chips are now 47.8% of everything Korea exports

Tuesday, September 22, 2026 · 5-minute read · Free edition

The tape

Seoul took the export print and ran with it. KOSPI closed at 7,007.72, +1.65% (+113.49), back above 7,000 for the first time in seven sessions; Samsung Electronics ₩274,000 (+4.98%) led the index, SK hynix ₩1,868,000 (+0.59%) lagged it. Institutions bought a net ₩1.49T while retail sold ₩2.98T and foreigners sold ₩160.3B. KOSDAQ +1.11% to 836.27. (Financial News, Seoul Shinmun)

New York was louder. SOXX +4.93% to $559.34 against SPY +1.55% — a 3.4-point spread. AMD +9.95% to $615.52, closing above a $1 trillion market value for the first time; Micron +2.77% ($1,043.96) nine days before results, Nvidia +2.30% ($227.38), Broadcom +1.60% ($362.66), SK hynix's Nasdaq line +0.73% ($188.86). SanDisk −1.41% ($1,766.64) was the only memory name lower. (SOXX, SPY, AMD, CNBC, MU, NVDA, AVGO, SKHY, SNDK)

Three signals

1. Korea's September 1–20 customs data broke the chip series in a way that should worry people who like the number. Total exports $71.4B, +78.3% YoY, a record for the period. Semiconductors alone were $34.1B, +259.4% — the first time chips have cleared $30B in a 20-day window — and 47.8% of all exports, up 24.1 percentage points in a year. Daily-average exports were $4.61B (+89.8%); imports rose only 26.7%, leaving a $23B surplus in twenty days. By destination: Taiwan +128.5%, the US +118.0%, China +113.8%. Why it matters: volume did not triple; price did. The export line is now a memory-price index wearing a trade-statistics costume. A country that was 23.7% chips a year ago could absorb a memory downcycle in its current account. At 47.8% it cannot. (Money Today, Seoul Shinmun)

2. Samsung's 4nm foundry line is full, and it is full of memory. Reporting in Seoul on Monday says Samsung has allocated more than half of its current 4nm capacity to HBM4 base dies, that the node is running at full utilisation, and that recent 4nm orders have been repriced upward on the crowding. HBM4 revenue is expected to grow more than 3× QoQ in Q3 and to be over 60% of second-half HBM revenue, with Pyeongtaek P4 taking the DRAM side and 2nm under study for HBM5; Citi models Samsung's HBM share rising from 30% this year to 42% in 2027. Why it matters: the base die is the logic part of HBM, and it is why Samsung's two weakest businesses are now propping each other up. But a foundry whose leading node is half-booked by its own memory division is not a merchant foundry at that node. External 4nm customers — Groq's LPU is one — are bidding against Samsung's internal HBM roadmap, and the repricing says who is winning. (Money Today)

3. A phone-glass company just committed 1.4× its own equity to semiconductor glass substrates. JNTC filed a new-facility-investment disclosure with the exchange on Monday: ₩347.0B for a TGV (through-glass via) substrate plant in Gimcheon, about 100,000 m², 140.08% of the company's equity, built between January 2027 and June 2030, with roughly 430 hires and mass production targeted in 2027. The company reports a 94% yield on parts from 0.3mm to 2.0mm and has a commercialisation agreement with Japan's Toppan. Why it matters: glass substrates have been a 2027-or-later story for three years, and nobody who would know has put a balance sheet behind them. A disclosure at 140% of equity is not a press release; it is a solvency-level bet by a supplier whose day job is cover glass, and it dates the technology more credibly than any vendor roadmap has. (DART, THE ELEC; the English edition at Seoul Economic Daily rounds the figure to ₩340B and omits the equity ratio)

Korea-only radar

Items we found only in Korean coverage as of 06:30 KST, September 22.

• Hana Materials filed a correction to a share-pledge agreement that could change its largest shareholder. The KOSDAQ silicon- and SiC-electrode maker — whose parts sit inside the etchers at every Korean fab — amended a Monday disclosure covering a pledge of the controlling stake. Control of a consumables supplier is a supply-chain fact, not only a governance one. No English report found. (DART)
• Samsung SDI disclosed an equity investment in a related party on Monday; the filing sits on our watchlist because SDI's electronic-materials arm supplies photoresist and CMP slurry into the same fabs. (DART)
• EST Electronics, an electrostatic-chuck maker, filed to list on KOSDAQ via the technology-exemption route: 2.2M new shares at ₩10,600–12,400, ~₩23.3–27.3B raised, ~₩172.5B post-money, subscription Oct 22–23. It is explicitly pitching glass-core substrates and OLEDoS as its growth case — the same bet as signal 3, from the chuck side. No English report found. (THE ELEC)

Number of the day

24.1 percentage points — the one-year rise in semiconductors' share of Korean exports, from 23.7% to 47.8% over September 1–20. Korea has never been this close to being a one-product economy in the data era. (Money Today)

Calendar

• Thu Sep 24 – Sat Sep 26 — Chuseok. Korean markets closed; no issue on the 24th or 25th. Next issue Wednesday the 23rd, then Monday the 28th.
• Wed Sep 30 (US) — Micron FQ4 results: the first HBM4 and NAND pricing commentary of the season, and the cleanest read on whether the price move in signal 1 is holding.
• Wed Oct 1, 09:00 KST — Korea Customs full-September exports; watch whether the chip share sticks above 45% on a full month.
• ~Thu Oct 8 — Samsung Electronics 3Q26 preliminary results.
• Thu Oct 22 – Fri Oct 23 — EST Electronics public subscription.

Silicon Peninsula is written from primary Korean sources every weekday morning (KST). Numbers are quoted from the cited source; where Korean outlets use won, we keep won. Founding-member Pro seats ($99/yr, first 50): reserve one here. Reply to this email with a company you want tracked. Forward it to someone who models memory prices for a living.