Silicon Peninsula #005 — The shortage moves down the stack, and Solidigm goes looking for American land

Monday, September 21, 2026 · 5-minute read · Free edition

The tape

Friday was a memory day on both sides of the Pacific. Seoul closed the week with KOSPI at 6,894.23, +2.66%, Samsung Electronics at ₩261,000 (+3.37%) and SK hynix at ₩1,857,000 (+6.42%); SK Square added 7.04%. Foreigners bought a net ₩438.8B, their first net purchase in eight sessions. (Seoul Shinmun, NewsClaim)

New York then paid up for the same thing, and paid most for NAND. SOXX +2.69% to $533.07 against SPY +0.13% — a 2.5-point spread in a session. SanDisk +10.99% to $1,791.82 and Micron +3.92% to $1,015.80, back above $1,000 a week before results. AMD +2.70% ($559.82), Broadcom +2.97% ($357.61), SK hynix's Nasdaq line +2.46% ($187.50), Nvidia +1.34% ($222.27). (SOXX, SNDK, MU, AMD, AVGO, SKHY, NVDA, SPY)

Three signals

1. Solidigm is scouting sites for a US NAND fab — SK hynix's first American memory production of any kind. Industry reporting on Friday put SK hynix's US NAND subsidiary in a site and requirements review for a volume NAND line on the US East Coast. Solidigm today runs one fab, in Dalian, China, with only a headquarters and R&D in the States; SK hynix says it "is reviewing various ways to strengthen competitiveness" and that nothing is decided. Why it matters: Korea's memory industry has agreed to package chips in America — SK hynix broke ground at West Lafayette, Indiana in August — but never to make the wafers there. The tell is that the candidate is NAND, not DRAM. A NAND front end is the cheaper experiment: no HBM allocation to disturb, and a tariff-proof line for the enterprise SSDs US data centers are short of. (THE ELEC)

2. The NAND numbers explain the urgency better than the site search does. The top five NAND brands booked $68.87B in Q2, +77% QoQ. SK hynix group, including Solidigm, cleared $14.27B, up 89.5%; Micron nearly doubled to $11.85B (+99.2%), taking third from Kioxia; Samsung led with $23.06B (+70.7%) and a 29.3% share. Counterpoint puts the quarter's NAND price rise at 55%. Intel's Lip-Bu Tan told an AI infrastructure forum in Santa Clara on Sep 15 that memory prices have risen five to seven times and that "the situation will get worse." Why it matters: DRAM tightness was an HBM story, and therefore a Korea-and-Micron story. NAND tightness is an enterprise-SSD story — a Solidigm and Samsung story — and it is compounding faster. 77% in a quarter is not a cycle, it is a queue, and American land is what you buy when you think the queue outlives the tariff. (TrendForce, Seoul Economic Daily)

3. The same shortage is quietly rearranging the phone chipset market in Samsung's favour. Counterpoint's Q2 chipset numbers, published Friday in Korea, put Samsung's Exynos at 9% — up 3pp YoY, its best quarter since Q1 2024 — on Exynos 2600 in the Galaxy S26 and S26+ and Exynos 1680/1480 in the A57/A37. MediaTek fell 5pp to 31%, Qualcomm 3pp to 23%, Apple rose 4pp to 19%. Global smartphone shipments fell 21% YoY in the quarter. Why it matters: every one of those moves is attributed to memory. MediaTek and Qualcomm lost low- and mid-tier volume because their customers could not buy DRAM at a price that works below $300; Samsung's mobile unit is squeezed on the same input but buys it from the same building. Vertical integration has been a cliché at Samsung for a decade — this is the quarter it shows up in someone else's share. (THE ELEC)

Korea-only radar

Items reported in Korean that we did not find in English coverage.

• SK hynix has formally answered the exchange on the Intel Ohio reports. A Sep 18 filing responds to a KRX inquiry about press reports of memory production talks with Intel and classifies the answer as undetermined — the regulatory equivalent of "still talking." (DART)
• onsemi wants to delete the power-module assembly step, using a 12-inch silicon wafer rather than a PCB as the package substrate and co-integrating power devices with drivers: 3–5× power density, 15% lower inverter losses, Subaru as launch partner. Korea's substrate makers should read it as a demand-shift risk, not a customer win. (THE ELEC)
• DART watchlist, 24h: Samsung Electronics filed a largest-shareholder shareholding change report; Hanmi Semiconductor and LG Innotek each filed IR notices. (Samsung, Hanmi, LG Innotek)

Number of the day

+270.1% — the year-on-year rise in Korea's semiconductor exports over September 1–10: $16.48B of a record $35.0B in total exports (+82.6%). Taiwan (+176.0%) and the US (+137.5%) led. The 1–20 print lands this morning. (Money Today)

Calendar

• Mon Sep 21, 09:00 KST — Korea Customs Service September 1–20 exports. Watch whether the chip line holds a triple-digit growth rate on a larger base.
• Thu Sep 24 – Sat Sep 26 — Chuseok. Korean markets closed; no issue on the 24th or 25th.
• Wed Sep 30 (US) — Micron FQ4 results, the first HBM4 and NAND pricing commentary of the season.
• ~Thu Oct 8 — Samsung Electronics 3Q26 preliminary results; same day, the Lam Research–BCNC edge-ring ruling in Seoul.

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.