AI Capex Scare Hits Korea Chips: SK hynix Falls 7%, Samsung 3% as Alphabet's Cash Burn Tests Sold-Out Memory Contracts
AI Capex Scare Hits Korea Chips: SK hynix Falls 7%, Samsung 3% as Alphabet's Cash Burn Tests Sold-Out Memory Contracts
📌 The Oct 30 Sell-Off at a Glance
Card 1: Korea Exchange regular-session closes as reported. Card 2: Alphabet's 3Q26 results as reported by CNBC and Reuters. Card 3: SK hynix management remarks on its 3Q26 earnings call.
One week after both reported record quarters, Korea's two memory giants were sold hard on Friday for a reason that had nothing to do with their own numbers. Alphabet's negative free cash flow and an unchanged $195–205B capex plan revived the question of whether AI spending pays off. On Oct 30, SK hynix fell 7.08% and Samsung Electronics 3.02%. This post weighs that fear against what the memory makers have actually locked in: multiyear supply contracts with deposits.
1. What Happened on Friday
Reported FactsKorea: The KOSPI closed down 3.48% at 5,730.74, and a sell-side sidecar paused program selling around 10:05 a.m., the first since the index's 7.57% plunge on Oct 15 (Korea Times). SK hynix touched an intraday low of ₩1,381,000, down 9.50%, before closing at ₩1,418,000. Foreign investors net sold about ₩429B of SK hynix and ₩213B of Samsung common shares (Yonhap). Chip equipment names such as Wonik IPS (−7.72%) and Jusung Engineering (−6.78%) fell further.
Reported FactsThe US trigger: Alphabet missed on revenue ($127.58B vs $128.22B) and adjusted EPS ($2.67 vs $3.02), and reported free cash flow of −$9.07B, its second negative quarter in a row (CNBC). Its Q3 capex was $51.36B, and CFO Anat Ashkenazi said capex will "increase significantly in 2027." The stock dropped about 13% on Oct 29, its worst day on record. Micron fell 4.98% and the Philadelphia Semiconductor Index 1.42% (Yonhap).
Chart: (A) One-day moves, US closes on Oct 29 and Korean closes on Oct 30, 2026 (Yonhap, Korea Times); (B) 3Q26 operating profit vs 4Q26 FnGuide consensus, KRW trillion (company releases; Seoul Economic Daily, Oct 30, 2026).
2. Why a Google Miss Hits Korean Memory
AnalysisThe link is simple: hyperscaler capex is the end demand for HBM and server DRAM. When Alphabet burns cash to build data centers, the market asks whether that spending can continue, and memory, the most cyclical part of the AI supply chain, gets sold first. Daishin Securities' Lee Kyung-min told Yonhap that Alphabet, Intel and Amazon results together "widened doubts about the sustainability and profitability of AI investment."
AnalysisBut read the same Alphabet report from a supplier's side, and it is not a spending cut. The 2026 guide held, 2027 is going up, and Google Cloud revenue more than doubled to nearly $31B with a backlog of roughly $560B (CNBC). Microsoft's quarterly capex and finance leases rose 30% to $45.2B. The worry is about hyperscaler returns, not about chip orders being cancelled. For memory makers, the risk shows up only if capex plans are actually trimmed, which none of these companies announced.
3. The Contract Cushion: SK hynix vs Samsung
Both companies used their calls to stress long-term agreements (LTAs). The table compares what each disclosed; projections are company targets, not guarantees.
| Item | SK hynix | Samsung Electronics |
|---|---|---|
| Customers under LTA | 14 signed, incl. major global CSPs | 10 signed, 10 more in talks |
| Capacity coverage | >50% of 2027–28 capacity | Target 60–70% of capacity by 2030 |
| Term and terms | Typically 5 years; prices within agreed ranges; deposits as safeguards | Multiyear; 2027 HBM priced at target levels |
| Sold-out claim | DRAM and HBM "effectively sold out" through 2029 | 2027 HBM supply sold out |
| 4Q26 OP consensus (1-month change) | ₩101.0T (+13.9%) | ₩116.8T (−3.3%) |
| Share move, Oct 30 | −7.08% | −3.02% |
Sources: SK hynix 3Q26 earnings call (Investing.com transcript; Yonhap Infomax, Oct 28); Chosun Biz and Herald Business (Samsung LTAs, Oct 30); Economist Korea (Samsung HBM sold out, Oct 30); FnGuide via Seoul Economic Daily (consensus, Oct 30); Yonhap (closes, Oct 30). Samsung consensus is group-level.
Reported FactsSK hynix said pricing in its LTAs reflects market conditions within an agreed range, and that deposits are included "to ensure that customers' purchase plans lead to actual orders and shipments" (Investing.com transcript). It also said 2027 capex will rise significantly as its first Yongin fab ramps. FnGuide data cited by Seoul Economic Daily show SK hynix's Q4 operating-profit consensus rising 13.9% in a month while its shares fell 13.5% over the same period.
💡 Market Analyst Takeaway
AnalysisFriday's move is a valuation reset driven by sentiment, not a change in reported fundamentals. SK hynix fell more than Samsung because it is the purer AI-memory play and had rallied on its earnings; its Q4 estimates went up, not down. Deposit-backed LTAs make demand stickier than in past cycles, but they are not ironclad: prices float within ranges, and a deep capex cut would still pressure renewals and spot pricing. Our read is that the contract book buys time, roughly through 2027–28 for SK hynix, rather than immunity.
AnalysisThe useful signal for foreign investors is the gap between estimates and prices. Korea's Q4 earnings outlook is now heavily concentrated in the two chipmakers, which Seoul Economic Daily put at 73.4% of forecast KOSPI operating profit. That makes both stocks the market's main gauge of AI-spending risk, so volatility is likely to track US hyperscaler headlines more than Korean data until the next round of capex guidance.
4. What to Watch Next
- Hyperscaler capex guidance: Alphabet promised 2027 detail on its Q4 call; any cut from a large cloud buyer would matter more than a cash-flow miss.
- SK hynix buyback: its roughly ₩20T repurchase runs to Jan 28, 2027, with ₩10T to be cancelled (Herald Business), a steady source of demand for the shares.
- Samsung's January board: details on the remaining ₩55–75T of 2026 returns are due late January (Economist Korea).
- Foreign flows: whether Friday's ₩429B of SK hynix net selling extends into November.
Related coverage: Samsung's record Q3 and its January return decision, SK hynix's Q3 beat and ₩100T return plan, and HBM orders exceeding 2x supply.
Check the Primary Sources
SK hynix's 3Q26 results, presentation and LTA disclosures are on its official investor relations site.
🔍 SK hynix Official IR: 3Q26 Results & Presentation
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