The TAIEX closed Monday’s session at 43,386.41, up 0.62%, and it did so without its usual engine. TSMC fell 2.27%, yet the index recovered from a sharply lower open to finish in the green — a session defined by rotation rather than leadership from the heavyweight. MediaTek’s 9.99% surge did much of the lifting, alongside broad buying in memory, passive components, ABF substrate and silicon IP names.
A rally without its anchor
TSMC (2330) closed at NT$2,370.00, down 2.27%, extending losses after a weak open. That drag kept the TWSE Semiconductor sub-index to a modest +0.23% — a figure that badly understates the dispersion inside the sector. MediaTek (2454) jumped 9.99% to NT$3,910.00, essentially the daily limit, while UMC (2303) slid 2.48% to NT$118.00. Hon Hai (2317) added 1.00% to NT$253.00. Outside tech, Financials & Insurance rose 0.94% and Shipping gained 0.88%, giving the recovery breadth beyond the AI complex. Several mid-caps in thermal and component niches hit their 10% limits.
The overnight setup was supportive rather than decisive: the S&P 500 closed Friday at 7,489.72 (+0.70%) while the Philadelphia Semiconductor Index was nearly flat at 11,311.08 (+0.07%). S&P 500 futures traded firmer through Asian hours, up 0.51% at 7,557.50.
Institutional flows: trusts absorb the foreign bid-hitting
Monday’s official TWSE flow data — the numbers we track daily — showed foreign investors and dealers selling while domestic investment trusts leaned hard the other way:
| Investor type | Net trading value (Aug 3) | Direction |
|---|---|---|
| Foreign investors | NT$-19.19B | Net sell |
| Investment trusts | NT$+21.07B | Net buy |
| Dealers (prop + hedge) | NT$-20.65B | Net sell |
| Three institutions combined | NT$-18.78B | Net sell |
That is a clean picture: foreigners sold Monday’s tape, and domestic trusts absorbed almost exactly that amount. The combined institutional line was negative only because dealer desks sold alongside the foreign community. An index that closes up 0.62% against NT$18.78B of combined institutional selling implies meaningful non-institutional demand underneath.
Positioning backdrop — previous-session data
Derivatives positioning figures lag by a day, so the following describes where books stood going into Monday, not what happened during it. As of Friday, July 31, foreign investors held a net open interest of -82,515 contracts in TAIEX futures (TX), after a day’s net volume of -4,292 — a sizable net short book. The options put/call ratio stood at 107.27% on open interest and 96.48% on volume, tilting mildly toward puts on OI. Monday’s prints publish with the usual lag and will show whether the futures short grew into the strength.
Leverage and shorts: three channels, three stories
Taiwan’s leverage data splits into distinct channels, and Friday’s figures (the latest published) point in different directions:
- Retail leveraged longs (margin purchases): the market-wide margin loan balance rose NT$13.60B to NT$507.5B as of Friday — retail continues to add leverage. UMC saw the sharpest single-name build, +16,780 lots to 160,306. MediaTek added 568 lots. Notably, TSMC’s margin balance fell 1,375 lots and Hon Hai’s fell 1,797 — retail was trimming the largest caps even before Monday’s TSMC weakness.
- Institutional shorts (SBL balances): the securities-lending channel was mixed, with balances rising in 484 shortable issues and falling in 400. TSMC’s SBL balance edged up 242,000 shares to 16.0 million, while institutions covered in Hon Hai (-2.46 million shares) and UMC (-6.21 million shares).
- Retail shorts (margin shorts): small moves throughout — UMC +88 lots, TSMC -6 lots — nothing signal-worthy.
ADR gap and the currency
TSMC’s ADR closed Friday’s US session at $404.25, which works out to roughly 10.8% above Monday’s Taipei close on a five-share basis. Two caveats keep us from over-reading that: the closes come from different sessions, and the ADR premium is structural — it has run roughly 15-25% in recent years owing to limited fungibility. The level is never the story; the change is. A measured gap sitting below the recent structural band, on a day Taipei’s line fell 2.27% after the ADR was fixed, suggests the premium has been compressing — but tonight’s US session is the cleaner read.
The Taiwan dollar softened slightly, with USD/TWD at 32.47 at Monday’s close, up 0.23% — a modest move that leaned in the same direction as the foreign cash-market selling on the day.
Reference: key names at the close
| Stock | Close (NT$) | Day | PER | Yield | Foreign ownership |
|---|---|---|---|---|---|
| TSMC (2330) | 2,370.00 | -2.27% | 32.60 | 0.91% | 69.18% |
| MediaTek (2454) | 3,910.00 | +9.99% | 58.71 | 1.50% | 55.09% |
| Hon Hai (2317) | 253.00 | +1.00% | 17.79 | 2.86% | 40.23% |
| UMC (2303) | 118.00 | -2.48% | 18.20 | 2.16% | 41.32% |
Valuations as of the July 31 TWSE publication.
What to watch
- Monday’s TAIFEX positioning print: whether foreign investors added to the -82,515-contract TX net short into Monday’s recovery, or began covering. The cash-market selling says they leaned bearish; the futures book will confirm or complicate that.
- TSMC’s US session tonight: after a 2.27% Taipei decline, the day-to-day change in the ADR gap — currently measured below its recent structural range — is the tell on how offshore investors are pricing the pullback.
- The trust bid versus retail leverage: investment trusts bought NT$21.07B on Monday while the margin balance builds NT$13.60B at a time. If foreign selling persists, watch whether domestic demand of this size keeps showing up.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.