A pre-earnings dip that didn’t last
The TAIEX opened lower on caution ahead of NVIDIA’s results, then spent the rest of Wednesday’s session erasing the doubt. The index closed at 45,832.62, up 663.16 points (+1.47%), with turnover of roughly NT$804.2 billion. The bid was unmistakably institutional and unmistakably concentrated: mega-cap tech and the AI optical supply chain — co-packaged optics, silicon photonics, high-end PCBs — did the heavy lifting, with Tuesday’s US session providing the runway (the Philadelphia Semiconductor Index rose 1.44% to 11,588.04; the S&P 500 added 0.32% to 7,677.28).
Flows: all three camps on the buy side
Our signature table first. All three institutional categories were net buyers on Wednesday, a combined NT$59.39 billion — a decisively one-directional session.
| Investor type | Net trading value (Aug 26) |
|---|---|
| Foreign investors | +NT$36.60B (net buy) |
| Dealers (prop + hedge) | +NT$17.93B (net buy) |
| Investment trusts | +NT$4.86B (net buy) |
| Combined | +NT$59.39B |
One caveat on positioning: derivatives data lag by a day. As of Tuesday’s session, foreign investors still carried a net short of 85,380 contracts in TAIEX futures open interest, and the options put/call ratio stood at 101.99% on open interest (110.78% on volume). Those are Tuesday numbers, not a read on Wednesday’s move — but they frame the question of the week: does the futures short book get trimmed now that the cash book is buying in size? Wednesday’s TAIFEX release will tell.
Semis: MediaTek leads, the optics complex goes vertical
- MediaTek (2454) was the day’s heavyweight standout, up 5.62% to NT$3,945.
- TSMC (2330) added NT$15 (+0.63%) to NT$2,415 — modest, but steady index support.
- Hon Hai (2317) gained 1.44% to NT$246.50; UMC (2303) was the notable laggard, down 1.20% to NT$123.50.
- Largan Precision (3008) hit the 10% limit at a record NT$6,290 on its push into fiber array units and silicon-photonics interconnects. Custom-ASIC house Creative (3443) and optical-chip maker LandMark (3081) also went limit-up, expanding Taiwan’s thousand-dollar club to 49 names.
By sector index: Semiconductors +1.20%, Financials & Insurance +0.32% — and a striking +4.01% in Shipping, a reminder the rally wasn’t purely a tech story.
Leverage and shorts: three channels, three different messages
Taiwan’s leverage data comes in three distinct channels, and as of Tuesday’s figures (Wednesday’s not yet published) they aren’t saying the same thing. Retail margin longs (rong-zi) rose a modest NT$1.68 billion to NT$546.9 billion market-wide — retail is participating, not chasing. Within that, UMC margin balances jumped 3,976 lots even as the stock fell, a classic retail dip-buy. In the institutional short channel (SBL), breadth was near-flat — balances rose in 429 shortable issues and fell in 440. The single-name detail is more interesting: Hon Hai’s SBL balance climbed 5.06 million shares to 54.3 million even as the stock rose, suggesting some institutions are leaning against the move, while TSMC and MediaTek SBL balances both edged lower.
The ADR gap, read properly
TSMC’s ADR closed Tuesday in New York at $417.41, about 9.9% above Wednesday’s Taipei close on a per-share basis. Two reminders before anyone calls that a trade: the ADR premium is structural — roughly 15–25% in recent years, reflecting limited fungibility — and the two closes are from different sessions, with Taipei’s Wednesday gain printed after New York went home. The level is not a signal; the day-to-day change in the gap is what carries information, and by that lens the premium currently sits toward the narrow end of its recent range. Watch how the ADR trades tonight around NVIDIA’s report.
Valuation snapshot (Aug 25, TWSE)
| Stock | PER | PBR | Yield | Foreign ownership |
|---|---|---|---|---|
| TSMC (2330) | 27.8x | 9.68x | 0.92% | 69.2% |
| MediaTek (2454) | 61.7x | 14.05x | 1.43% | 55.7% |
| Hon Hai (2317) | 16.0x | 1.79x | 2.95% | 40.3% |
| UMC (2303) | 18.8x | 3.53x | 2.09% | 41.1% |
The dispersion tells the story: the market is paying growth multiples for AI compute exposure (MediaTek at 61.7x) while mature foundry and assembly trade like value.
What to watch
- NVIDIA’s FY2027 Q2 results — the consensus revenue bar sits near US$92 billion, and Wednesday’s whole rally was positioned around it. S&P 500 futures were essentially flat (-0.06%) into the print.
- Wednesday’s TAIFEX data, once published — whether the foreign futures net short (85,380 contracts as of Tuesday) starts narrowing alongside NT$36.6B of cash buying, or the cash/futures divergence widens further.
- USD/TWD at 31.79 — a firm-to-steady currency is doing quiet work behind the foreign inflow; a break weaker would be the first thing to sour it.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.