A 1,885-point round trip
The TAIEX closed Wednesday at 42,948.91, down 358.63 points or 0.83% — a closing print that badly understates the session. After Tuesday’s 1,612.60-point (3.59%) slide, the benchmark opened firmer at 43,449.45 and touched 43,741.54 early before buckling: a wave of foreign selling drove the index more than 1,450 points off its high to an intraday low of 41,855.82, breaching the 42,000 line. Afternoon dip-buying — investment trusts, government-linked funds and bargain hunters — then clawed back nearly 1,100 points into the 13:30 close. The 1,885.72-point intraday swing was the fourth-largest in TAIEX history, and turnover swelled to NT$1.1148 trillion as foreign sellers and domestic buyers traded heavily in both directions.
The proximate trigger was the U.S. midterm elections: early Democratic gains stoked concern over tighter regulatory oversight and limits on data-center expansion, layered onto existing anxiety about returns on AI capital spending.
Institutional flows: foreigners unload NT$150 billion
| Investor group (Nov 4) | Net trading value |
|---|---|
| Foreign investors | NT$-149.90B (net sell) |
| Investment trusts | NT$+27.63B (net buy) |
| Dealers (prop + hedge) | NT$-37.52B (net sell) |
| Three institutions combined | NT$-159.79B |
Foreign investors sold a net NT$149.90 billion of Taiwan shares on Wednesday, extending a repatriation streak that included a single-day outflow of more than NT$107 billion earlier in the week. Investment trusts bought NT$27.63 billion net — the visible hand behind the afternoon rebound — while dealers sold NT$37.52 billion. The outflow kept pressure on the currency: USD/TWD finished at 32.81, with the Taiwan dollar weaker by 0.68% after opening through the 32.8 level and drifting toward 32.90 intraday.
Semiconductors: TSMC drags while the rest of the sector rallies
TSMC (2330) opened higher at NT$2,320, sank to NT$2,235 during the mid-session rout, and recovered to close at NT$2,260, down 1.53% from Tuesday’s NT$2,295. Yet the TWSE semiconductor sub-index actually rose 1.06%, because the weakness was concentrated at the top: MediaTek (2454) reversed an intraday loss of roughly 2.6% to close up 1.09% at NT$3,715, and UMC (2303) gained 2.43% to NT$105.50. The divergence from the U.S. tape was stark — the Philadelphia Semiconductor Index had risen 2.63% in Tuesday’s U.S. session and the S&P 500 added 0.36%, so Taipei’s rout ran directly against the overnight lead. AI hardware stayed heavy ahead of mid-November earnings: Hon Hai (2317) fell 2.24% to NT$240 and Quanta (2382) dropped 2.89% to NT$302.5. Financials and insurance added 0.71%, shipping 0.16%.
On the ADR channel: TSM ended Tuesday’s U.S. session at $404.80, about 17.5% above Wednesday’s Taipei close on a five-shares-per-ADR basis. That sits inside the roughly 15–25% structural premium the ADRs have carried in recent years, and the two closes come from different sessions — the level itself is not a mispricing signal. What matters from here is whether the gap widens or narrows as the two markets digest the same news.
Positioning and leverage: longs lighten, institutional shorts lean in
TAIFEX data run a day behind, so the latest derivatives read is Tuesday’s: foreign investors held a net short of 91,812 TAIEX futures contracts in open interest (day’s net volume -2,382), and the volume-based put/call ratio stood at 79.99%. That describes how books were set coming into Wednesday — not today’s positioning, which publishes tomorrow.
Taiwan’s three leverage channels told a consistent deleveraging story as of Tuesday. Retail leveraged longs shrank: the market-wide margin loan balance fell NT$22.92 billion to NT$599.8 billion, with margin balances down in all five bellwethers we track (UMC -10,597 lots, TSMC -873, Hon Hai -663). On the institutional short channel — SBL borrowing, distinct from retail margin shorts — balances rose in 577 issues versus 339 declines, with Hon Hai adding 3.15 million borrowed shares and TSMC 515,000. Retail longs stepping back while institutional shorts build is the defensive tilt our positioning scoreboard flagged into the session, and Wednesday’s cash-market outflow confirmed it.
What to watch
- Monthly revenue filings, due November 10. October sales from TSMC and the AI supply chain land in six days — the first hard-data test of the AI capex doubts driving this correction.
- Wednesday’s TAIFEX positioning, published tomorrow. Whether foreign investors pressed their 91,812-contract net short into the break below 42,000 or covered into domestic buying will show if the futures overhang is building or clearing.
- The overnight U.S. session. S&P 500 futures were marked 0.24% lower at 7,578.50 during Taipei hours; clarity on the midterm results is the swing factor for Thursday’s open.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.