A 1,156-point rout caps a brutal October
Taiwan’s benchmark had nowhere to hide on Friday. The TAIEX fell 1,156.50 points, or 2.49%, to close at 45,211.83 — its lowest finish since August 24 — breaking below its half-year moving average on turnover of NT$877.73 billion. The selling was front-loaded and deep: after an early high of 46,139.79, the index lost more than 1,600 points at the session trough of 44,726.26, briefly breaching 45,000 before a partial afternoon recovery. The damage for the week is 1.8%; for October as a whole, the index has shed 2,728.30 points, a 5.69% monthly loss.
The trigger came from overseas. Disappointing earnings and guidance from major US technology names — Alphabet, Amazon and Intel among them — reignited skepticism about the payoff on massive AI capital spending. Wall Street’s Thursday close set the tone: the Philadelphia Semiconductor Index fell 1.42% to 11,518.20 and the S&P 500 slipped 0.30% to 7,720.39, and the pressure did not let up during Asian hours, with S&P 500 futures down a further 0.86% at 7,687.50 while Taipei traded.
Semiconductor heavyweights sold hard; Delta hits the limit
TSMC (2330) fell NT$45, or 1.86%, to NT$2,370 on roughly NT$70.10 billion in turnover, trading a tight NT$2,360–2,380 range — a heavy but orderly decline for the bellwether. The pain was sharper down the cap table: MediaTek (2454) dropped 3.21% to NT$3,915 and UMC (2303) lost 3.46% to NT$111.50, while Hon Hai (2317) held up relatively well, off 1.01% at NT$245.50. The day’s most dramatic single-stock story was Delta Electronics (2308), which plunged by the daily limit, down NT$145 (9.79%) to NT$1,335 under severe selling pressure. The broader electronic technology sector fell 3.0%. Notably, though, the official TWSE Semiconductor sector index rose 2.24% on the day — the weakness was concentrated in the index heavyweights, not across the sector’s full breadth.
One ritual check: TSMC’s US-listed ADR closed Thursday at $431.81, roughly 18.8% above Friday’s Taipei close on a five-share-equivalent basis. That premium is structural — ADRs have carried a roughly 15–25% premium over Taipei in recent years given limited fungibility — and the two closes come from different sessions. The current gap sits comfortably inside the normal band; it is the day-to-day movement in this spread, not its level, that would carry a signal.
Institutional flows: foreigners unload NT$112.5 billion
The flow data — this site’s signature number — was unambiguous. The three major institutional groups sold a combined NT$139.84 billion net on Friday.
| Investor group | Net trading value (Oct 30) | Direction |
|---|---|---|
| Foreign investors | NT$-112.47B | Net sell |
| Investment trusts | NT$+23.99B | Net buy |
| Dealers (prop + hedge) | NT$-51.37B | Net sell |
| Combined | NT$-139.84B | Net sell |
Domestic investment trusts bucked the trend with NT$23.99 billion of net buying — a familiar pattern of local institutions absorbing foreign supply on sharp down days — but it was no match for the foreign outflow plus NT$51.37 billion of dealer selling.
The currency told the same story
Heavy foreign outflows pressured the New Taiwan dollar in a classic simultaneous stock-and-currency pullback. USD/TWD opened at 32.520 and traded a 32.480–32.676 range, briefly pushing through the 32.60 threshold before month-end exporter dollar selling and central bank smoothing narrowed the move. The pair finished at 32.60, with the TWD down 0.69% on the day.
Positioning backdrop: Thursday’s data, and the leverage channels kept straight
Friday’s derivatives and margin data are not yet published, so the positioning picture below is as of Thursday’s close — the setup going into the rout, not a reaction to it.
- Futures: foreign investors held a net short of 89,522 TAIEX futures contracts in open interest, having added a modest 4,605 contracts of net selling on the day. They entered Friday already positioned defensively.
- Options: the volume-based put/call ratio stood at 80.96% — not a level signaling panic hedging before the drop.
- Retail leverage (margin purchases): the market-wide margin loan balance rose NT$1.61 billion to NT$633.9 billion — retail leveraged longs were still inching up into the decline, a mild vulnerability if selling persists.
- Institutional shorts (SBL, distinct from retail margin shorts): securities-lending short balances rose in 509 issues and fell in 360. UMC stands out: its SBL balance jumped 24.25 million shares to 117.43 million on Thursday, while its retail margin-long balance also rose 8,821 lots — leverage building on both sides ahead of Friday’s 3.46% drop. By contrast, SBL balances in Hon Hai, Delta and MediaTek all declined.
Taken together, the scoreboard reads bearish on the institutional side (cash selling, an existing futures net short, rising SBL breadth) while retail leverage has not yet capitulated.
Valuation check after the drawdown
At Thursday’s TWSE readings, TSMC trades at 27.99x earnings and 9.74x book with a 0.91% yield; MediaTek remains the richest of the heavyweights at 66.80x earnings; Hon Hai is the value anchor at 16.35x and a 2.89% yield. Foreign ownership remains deep — 68.55% of TSMC, 53.88% of MediaTek — which is precisely why foreign flow swings move this market as much as they do.
What to watch
- Friday’s (October 30) TAIFEX data, published after the session: whether foreign investors extended their 89,522-contract futures net short into the rout, and where the put/call ratio lands.
- Foreign cash-flow persistence and USD/TWD: a second consecutive NT$100 billion-scale outflow would test the 32.676 intraday high on the currency despite month-end exporter supply.
- The US tech earnings tape: with S&P futures already down 0.86% during Asian hours, Monday’s Taipei open will again be set overnight in New York.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.