The first session after a historic drawdown is rarely about the index level — it is about who shows up to buy. On Monday, July 20, the answer was: domestic institutions, tentatively, and not much else. The TAIEX opened firmer, adding 121.88 points to 42,793.15 in early trade, but the bounce faded through the morning and the index closed down 0.52% at 42,449.70. That follows Friday’s 6.47% plunge — the largest single-day point drop on record — so a half-percent give-back reads less like fresh panic and more like a market still finding its footing.
Semiconductors: TSMC steadies, UMC craters
TSMC (2330) did its job as the index anchor, closing up 1.31% at NT$2,320 after rising as much as 2.2% intraday. The support came from the company’s announcement of an additional US$100 billion investment to expand its Arizona facilities, lifting its total commitment there to US$265 billion on the back of long-term AI demand. After Friday’s 7.3% slide in the stock, the market took the capex signal as a vote of confidence rather than a cost concern — at least for a day.
The rest of the sector told a different story. UMC (2303) collapsed 9.72% to NT$130.00, by far the day’s standout casualty among large caps. Friday’s positioning data (the latest published) showed pressure building from multiple channels: retail leveraged longs cut their margin balance by 11,283 lots, retail margin shorts jumped by 8,887 lots, and the SBL balance — the institutional short channel — rose by roughly 2.28 million shares to 106.7 million. At Friday’s close UMC still traded at 36.2x earnings and 4.45x book, rich by its own historical standards, which helps explain why it is bearing the brunt of the AI-trade unwind. MediaTek (2454) fell 0.89% to NT$3,340 and Hon Hai (2317) eked out a 0.21% gain to NT$234.50. The TWSE Semiconductor sub-index closed up 0.29% — a figure that flatters the sector, since TSMC’s weight masks broad weakness beneath it. Financials rose 0.57% and Shipping was flat at +0.05%.
Institutional flows: foreigners still selling, trusts absorbing
- Foreign investors: net sellers of NT$6.08 billion
- Investment trusts: net buyers of NT$14.65 billion
- Dealers (proprietary + hedge): net sellers of NT$8.06 billion
- Three institutions combined: net buyers of NT$0.50 billion
The headline is the deceleration, not the direction. Foreign investors sold again on Monday, but NT$6.08 billion is a fraction of Friday’s record NT$189.04 billion net sale. The heavy lifting came from investment trusts, whose NT$14.65 billion of buying more than offset foreign and dealer selling and left the combined tally marginally positive. Whether domestic institutions can keep writing that check is the week’s central question.
Positioning backdrop (previous-session data)
Derivatives and leverage figures below are from Friday, July 17 — Monday’s data are not yet published — so they describe the setup coming into today, not today’s action. Foreign investors carried a net short of 86,189 contracts in TAIEX futures open interest, and the OI-based put/call ratio stood at 92.94% (83.63% on volume). On the leverage side, the market-wide margin loan balance fell NT$27.61 billion to NT$588.0 billion, a meaningful one-day deleveraging by retail longs. In the institutional short channel, SBL balances rose in 659 issues and fell in 282 — short books were being built broadly, with Hon Hai (+13.1 million shares) and UMC (+2.3 million) among the notable additions. Taken together, the scoreboard describes a market that entered Monday defensively positioned across every channel: foreign cash outflows, a large futures net short, shrinking retail leverage, and widening institutional shorts.
Currency and the global tape
The Taiwan dollar weakened alongside the equity outflows. USD/TWD breached NT$32.40 intraday before settling at 32.35, up 0.28% on the day. The overnight backdrop offered little help: the S&P 500 fell 1.01% on Friday and the Philadelphia Semiconductor Index dropped 1.63%, while S&P futures were essentially flat (+0.02%) during Taipei hours. Sentiment remains hostage to questions over Fed policy, oil prices lifted by Middle East tensions, and — most directly for Taiwan — whether AI infrastructure capex will ever earn its cost of capital.
One detail worth flagging: TSMC’s ADR closed Friday at $398.37, putting the premium over Monday’s Taipei close at 11.1%. That gap is structural — ADRs have habitually traded roughly 15–25% over Taipei in recent years given limited fungibility — and the two closes are from different sessions, so the level itself signals nothing. But the compression to the low end of the recent range suggests US-hours holders marked TSMC down harder than Taipei did, and tonight’s ADR session will show whether the gap rebuilds.
Sentiment check
A Cathay Financial survey released Monday found retail confidence surprisingly intact: 57% of respondents still expect the TAIEX to top 50,000 in the second half of 2026. Inflation anxiety is the counterweight — 68% expect full-year inflation above 2%, more pessimistic than official forecasts.
What to watch
- Today’s TAIFEX data, published tomorrow: whether foreign investors trimmed or added to their 86,189-contract futures net short during Monday’s session.
- Investment trust follow-through: trusts bought NT$14.65 billion Monday; a second consecutive day of absorption would suggest the domestic bid is real, not a one-off.
- USD/TWD around 32.40: a decisive close above that intraday high would confirm the capital-outflow pressure the flow data implies.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.