摘要 · Summary
Markets & Semiconductors · Deep BriefSession of 28 Jul 2026
Asia-wide chip sell-off · one-page brief
Korea took the damage. Taiwan took the spillover.
On 28 July 2026 the TAIEX closed 2,030.83 points lower — the third-largest point drop in its history. Measured as a percentage it was the mildest fall of Asia's three big markets that day, and only the fourth-worst decline among the four largest point drops on record.
The Session in Four Numbers close · percentage · rank
- 41,603.36TAIEX close, −2,030.83 pts
- −4.65%Taiwan's decline — the mildest of the three
- −11%KOSPI, into a circuit breaker
- −13.5%SK Hynix, the epicentre
Where the Damage Landed Taiwan, by sector index
| Sector index | Move | Reading |
|---|---|---|
| Plastics 塑膠 | −8.30% | Hardest hit — and unexplained by any chip narrative |
| TPEx 櫃買 (small/mid caps) | −6.79% | The AI supply-chain theme names, unwinding |
| Electronics 電子 | −5.11% | Worse than the index; the weight that moved it |
| Semiconductors 半導體 | −4.42% | In line with the index — not the epicentre |
| Financials 金融 | −1.92% | Least affected of the majors |
| Telecoms 電信三雄 | +0.36 ~ +0.44% | Two of the three closed higher — where the money went |
What Follows 起 · 承 · 轉 · 合
| Beat | Page | What it covers |
|---|---|---|
| 摘要 Summary — this page | 1 | The session, the sectors, and why the headline number misleads |
| 起 · 承 · 轉 Context & Pivot | 2 | What fell where · why memory · how to read a point drop |
| 合 Resolution | 3 | 2026 in sequence · what would settle it · the open question |
Bottom line
A crowded AI-memory trade unwound across Asia. The damage concentrated exactly where AI-demand assumptions were doing the most valuation work — memory names, small caps, MediaTek — and was absent where cash flow is present-tense: Taiwan's three telcos closed flat to higher. "Third-largest point drop in history" measures the index level, not the severity.
起承轉 · Context & Pivot · Content 1 / 2
起 — What Fell, and Where three markets, one trade
Epicentre · Korea
KOSPI −11%
- Korea Exchange triggered a market-wide circuit breaker; trading halted 20 minutes.
- Samsung Electronics −13.1%, SK Hynix −13.5%.
- SK Hynix's US shares closed $143, below the $149 IPO price of its Wall Street debut earlier the same month.
- This came after the index had already fallen roughly 30% over July.
Spillover · Taiwan & Japan
TAIEX −4.65%
- Nikkei 225 −4.3% to 62,127.57; Hong Kong's Hang Seng actually closed up 0.41%.
- Taiwan's electronics index −5.11%, semiconductors −4.42%, small-cap TPEx −6.79%.
- Turnover NT$809.5bn; the close sat within ~38 points of the intraday low — no late bid.
承 — Why Memory, Specifically prose left · the split right
The trigger was not one event but a stack. Scepticism about the return on AI capital spending; Chinese competition, with ChangXin Memory Technologies named directly; and SK Hynix's own reported strategy shift through June–July — slowing its HBM4 ramp to redirect capacity into commodity DRAM, where shortage-driven margins had become more attractive. That last item is structural rather than a one-day event, and it is the one that re-rates the sector: it reframes memory makers from AI winners onto a commodity cycle. Overnight the Philadelphia Semiconductor Index had already fallen 2.2%.
- 4 limit-downWinbond, Nanya, Macronix and PSMC all closed limit-down — the follower leg of a Korean move.
- −2.98% vs −10%TSMC fell 2.98% to NT$2,280; MediaTek went limit-down. The closer to speculative AI content and further from committed foundry revenue, the harder the fall.
- NT$809.5bnTurnover rose into the fall, and the index closed within ~38 points of the intraday low — capitulation volume, not a dip being bought.
- +0.44% / +0.36%Taiwan Mobile and Chunghwa Telecom closed higher on stable cash flow and high yield — the rotation's destination, in the same session.
轉 — A Record Point Drop Is Not a Record Crash percentages recomputed from points and close
| Date | Points | Close | Decline (computed) | As printed |
|---|---|---|---|---|
| 2026/07/17 | −2,953.71 | 43,304.74 | −6.39% | −6.47% |
| 2025/04/07 | −2,065.87 | 19,232.35 | −9.70% | −9.70% |
| 2026/07/28 | −2,030.83 | 41,603.36 | −4.65% | −4.65% |
| 2024/08/05 | −1,807.21 | 19,830.88 | −8.35% | −9.10% |
合 · Resolution · Content 2 / 2
合 — 2026, in Sequence the same index, five months
- 05-04TAIEX gains 1,778.51 points in one session — the largest single-day point gain on record — closing 40,705.
- 05-26All-time intraday high 44,097.63.
- 07-13A first memory wobble: global chip stocks slide as SK Hynix sells off after its Nasdaq debut, having roughly tripled over the year.
- 07-17Record crash: −2,953.71 points (−6.39%) to 43,304.74. Foreign investors sell a record NT$189bn in one day.
- 07-27Close of 43,634.19 — the record crash fully recovered, and 329 points above it.
- 07-28−2,030.83 to 41,603.36. More than five times that recovery given back in one session; ≈5.7% below the May high.
- 44,097.63all-time intraday high, 26 May 2026
- −5.7%Thursday's close below that high
- NT$189bnrecord 1-day foreign net sell, 17 Jul
- NT$500bnNational Stabilisation Fund capacity
If the Authorities Step In Taiwan's FSC toolkit
| Tool | Mechanism | Signal it sends |
|---|---|---|
| Short-sale curbs | Margin requirement raised 90% → 130% | First and lightest lever |
| Financing relief | Collateral broadened beyond cash to securities and tangible assets | Aimed at forced-selling spirals |
| National Stabilisation Fund | Up to NT$500bn; last activated 8 Apr 2025 after the tariff crash | Read as systemic, not a valuation correction |
What Would Actually Settle It structure, not sentiment
- Korean memory stabilising — the causal upstream. Taiwan's memory names are followers here, not leaders.
- HBM4 versus commodity DRAM allocation. If SK Hynix is reallocating capacity into a shortage rather than responding to weaker HBM demand, this is a multiple re-rating, not a cycle turn.
- Whether CXMT's progress is in shipped, qualified product or in announcements — that decides whether this is a 2026 earnings event or a 2028 structural one.
- Earnings delivery from the small- and mid-cap AI supply chain, which Taishin Investment Advisory's Huang Wen-ching argues was priced for multi-year growth and stretched the index far from its moving averages (乖離).
- Whether the July low holds. The 28 July close of 41,603.36 is the reference now — a second failure there would make the May-to-July advance the top of a range rather than a pause in a trend.
- Regulatory response. Taiwan's FSC toolkit — short-sale margin from 90% to 130%, broadened financing collateral, and a National Stabilisation Fund of up to NT$500bn, last activated 8 Apr 2025 — would signal the authorities read this as systemic rather than as a valuation correction.
The unexplained figure
Taiwan's plastics index fell 8.30% — harder than semiconductors (−4.42%) and harder than the index itself. Nothing in the reporting explains why a traditional-industry sector led a session everyone agrees was about chips. Carried here as an open question rather than fitted to the story: it hints that indiscriminate deleveraging was also running.
Where it honestly lands
The direction is well corroborated: an AI-memory unwind, centred on Korea, spilling into Taiwan. The single clean cause is not established — sources emphasise different triggers, and anyone offering one is overclaiming.