The TAIEX closed Wednesday, August 5, at 44,611.60, up 1,250.94 points or 2.88%, with turnover expanding to roughly NT$1.14 trillion. The day’s defining story was the pairing of a violent overnight lead — the Philadelphia Semiconductor Index rose 6.55% on Tuesday as the S&P 500 gained 1.79% to a record close — with foreign investors buying NT$90.31 billion of Taiwan cash equities, one of the heavier single-day foreign inflows this site has logged. Semiconductors did the work: the TWSE Semiconductor sub-index rose 3.64%, against 0.83% for Financials & Insurance and a nearly flat 0.36% for Shipping.
The tape: chips lead, and the leaders led
TSMC rose NT$85, or 3.66%, to NT$2,405, anchoring gains across the memory, silicon wafer, optical communication and packaging supply chains. PCB and advanced packaging names were the speculative edge of the move, with multiple tickers at their daily limit-up ceilings on AI data center demand and progress in glass substrate and CoPoS validation. The macro backdrop helped: Brent crude fell more than 5% on reported progress in US–Iran talks, pulling Treasury yields lower and giving Asia a clean risk-on session.
| Stock | Close (NT$) | Change |
|---|---|---|
| TSMC (2330) | 2,405.00 | +3.66% |
| MediaTek (2454) | 4,000.00 | +3.49% |
| Hon Hai (2317) | 258.50 | +3.40% |
| UMC (2303) | 122.00 | +2.95% |
Institutional flows: all three groups on the bid
Wednesday’s official exchange data showed the three major institutional groups net buyers of NT$100.41 billion combined:
- Foreign investors: net BUY NT$90.31 billion — the overwhelming bulk of the day’s institutional demand.
- Investment trusts: net BUY NT$8.64 billion — domestic funds adding alongside, not fading, the move.
- Dealers (proprietary + hedge): net BUY NT$1.46 billion.
A NT$90 billion foreign print in a market that closed up nearly 3% is about as unambiguous as flow data gets. The New Taiwan dollar told the same story from the currency side: USD/TWD closed at 32.24, down 0.48%, consistent with foreign money moving into local assets.
Positioning: the futures short book is now the question
The interesting tension sits in the derivatives data — with the important caveat that TAIFEX figures run a day behind. As of Tuesday’s session (Wednesday’s data is not yet published), foreign investors carried a net open interest of -87,858 contracts in TAIEX futures, though Tuesday’s net volume was a modest +2,155 contracts. The options put/call ratio stood at 102.56% on open interest and 101.92% on volume — mildly puts-heavy, nothing extreme. So foreigners came into Wednesday’s session sitting on a sizable futures short book while then buying NT$90 billion of cash stock. Whether Wednesday’s rally forced a cut in that short position — or whether it was rebuilt as a hedge against the new cash exposure — is exactly what today’s TAIFEX release will answer. That release, not the stale Tuesday snapshot, is where the signal is.
Leverage and the short channels
Keeping Taiwan’s three distinct channels separate: retail leveraged longs (margin purchases), retail margin shorts, and the institutional SBL lending channel. Market-wide margin loan balance stood at NT$521.1 billion as of Tuesday, up NT$6.38 billion — retail leverage creeping higher but not spiking. At the single-stock level (also Tuesday’s data), TSMC margin balance rose 762 lots to 30,765 while its margin short balance fell 54 lots to just 47 — retail is long, not fighting the tape. On the institutional side, SBL balances rose in 543 shortable issues versus 379 declines, with TSMC’s SBL balance up 760,000 shares to 16.9 million and MediaTek’s up 494,000 to 2.7 million — some institutional short exposure being added into strength. Hon Hai stood out the other way: SBL balance down a chunky 5.94 million shares to 74.1 million, a meaningful institutional short reduction ahead of Wednesday’s 3.4% gain.
Valuation and the ADR gap
At Tuesday’s TWSE reference data, TSMC trades at 31.2x earnings and 10.2x book with a 0.95% yield; MediaTek at 63.8x earnings is priced for a great deal of AI edge-silicon success; Hon Hai at 17.8x and UMC at 17.8x remain the value end of the large-cap complex. Foreign ownership of TSMC sits at 69.1% of shares outstanding, so the foreign flow number and the stock are effectively the same trade. On the ADR: TSM closed at $417.17 in New York on Tuesday, roughly 11.8% above the (later) Taipei close on an adjusted basis. As regular readers know, the ADR habitually carries a structural premium of roughly 15–25% and the two closes come from different sessions — an 11.8% gap on staggered closes after a big Taipei up-day is unremarkable; it is the day-to-day change in this spread, not its level, that carries information.
What to watch
- Today’s TAIFEX release: did foreign investors cover any of the -87,858-contract futures net short after Wednesday’s rally, or add hedges against the new NT$90 billion of cash exposure?
- Monthly revenue filings by August 10: Taiwan-listed companies, TSMC included, must report July sales within five days — the first hard-data check on the AI demand narrative driving this leg.
- Retail leverage follow-through: whether Wednesday’s surge accelerates the margin loan build beyond the NT$6.38 billion daily pace, and whether SBL short balances keep rising into strength.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.