A heavy Friday: TAIEX gives back 1,196 points
Taiwan’s benchmark closed out the week under pressure. The TAIEX fell 2.67% on Friday, dropping 1,195.97 points to 43,654.84 at the 13:30 close, as Taipei absorbed an ugly overnight session in New York. The S&P 500 lost 1.21% to 7,408.30 on Thursday and the Nasdaq fell more than 2%, with the selling driven by familiar late-July anxieties: doubts about the sustainability of AI-related capital spending, sticky inflation prints, and oil pushing above $100 a barrel. Notably, the Philadelphia Semiconductor Index held up comparatively well overnight, down only 0.54% at 12,343.84 — Taipei’s chip complex fared worse than that on Friday, suggesting local positioning, not just imported sentiment, did some of the damage.
The session extends a rough stretch for the market. Investors are still working through the aftermath of July 17, when the index posted the largest single-day point drop in its history, and the tone since has been one of position reduction rather than dip-buying.
The tape: chips lead lower, UMC stands out
| Name | Close (NT$) | Change |
|---|---|---|
| TSMC (2330) | 2,350.00 | -2.29% |
| MediaTek (2454) | 3,750.00 | -3.23% |
| UMC (2303) | 128.00 | -7.58% |
| Hon Hai (2317) | 252.50 | -1.94% |
UMC was Friday’s clear casualty among the heavyweights, down 7.58% — a notably violent move for a foundry that entered the day trading at 34.8 times earnings and 4.28 times book (per Thursday’s TWSE valuation data), a multiple that leaves little room for disappointment in a de-rating tape. MediaTek, at 61.75 times earnings as of Thursday, also traded like a stock where valuation has become the argument. TSMC’s 2.29% decline was almost restrained by comparison. In the US, the TSM ADR closed Thursday at $415.58; as regular readers know, the ADR carries a persistent structural premium over the Taipei line — roughly 15–25% in recent years — and the two closes come from different sessions, so the level of the gap is not a signal in itself. It is the day-to-day change in that premium that tells you something, and we will be watching Friday’s US session for exactly that.
Flows: foreigners sell hard, trusts lean the other way
The signature numbers. On Friday’s official TWSE data, the three institutional categories sold a combined net NT$66.39 billion:
- Foreign investors: net SELL NT$60.95 billion — the overwhelming driver of the day’s supply.
- Investment trusts: net BUY NT$5.71 billion — domestic funds again on the other side of foreign selling.
- Dealers (proprietary + hedge): net SELL NT$11.15 billion.
With foreign ownership at 69.32% of TSMC and 55.59% of MediaTek, a foreign-led selling day lands squarely on the index heavyweights, and Friday’s tape reflected that.
Positioning and leverage: what the (Thursday) data shows
A note on timing: derivatives and leverage data below are Thursday’s figures — Friday’s prints were not yet published at the close, so treat them as the setup coming into the session, not the result of it.
On TAIFEX data through Thursday, foreign investors held a net short of 75,198 contracts in TAIEX futures open interest, and the OI-based put/call ratio stood at 119.11% (volume-based 104.64%). In other words, foreign books were already positioned defensively before Friday’s cash-market selling arrived.
On the leverage side, Taiwan’s three channels continue to tell distinct stories, and it is worth keeping them separate. Retail leveraged longs — the margin purchase balance — stood at NT$582.6 billion as of Thursday, down a marginal NT$0.20 billion, so the post-July-17 retail deleveraging appears to have slowed to a trickle rather than accelerated. In the institutional short channel (SBL), Thursday’s breadth was almost perfectly balanced: balances rose in 441 issues and fell in 458. Under the surface, the single-name detail is more interesting: Hon Hai saw a chunky 9.41 million shares of SBL short covering and UMC 2.24 million, while TSMC’s SBL balance ticked up by 152,000 shares. Institutional shorts, on this evidence, were trimming into the decline in the downstream names rather than pressing.
Currency and the macro overlay
USD/TWD closed at 32.35, essentially flat (-0.08%) — a notably calm currency session given the equity drawdown, and worth flagging in a week when the US Treasury’s inclusion of Taiwan on its currency monitoring list remains part of the backdrop. S&P 500 futures traded around 7,443.50 during Asian hours, off just 0.02%, offering Taipei no strong steer in either direction for the US open.
What to watch
- Friday’s TAIFEX prints (published after our deadline): whether foreign futures net open interest deepened beyond Thursday’s -75,198 contracts, and where the put/call OI ratio goes from 119.11%.
- The foreign cash-flow streak: a second consecutive NT$50 billion-plus selling day next week would mark this as a sustained reduction rather than a one-day risk cut; continued investment-trust buying is the counterweight to monitor.
- The TSM ADR premium in Friday’s US session: not the level, but whether the gap versus the 2330 close widens or compresses — the cleanest overnight read on how global investors are handicapping Taipei’s Monday open.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.