A record close without the heavyweights
The TAIEX rose 122.25 points, or 0.25%, to close Friday at 48,475.74 — a new all-time high and a third consecutive advance — and it did so with its largest constituents pointing the other way. TSMC (2330) slipped NT$10 to NT$2,500.00 (-0.40%), MediaTek (2454) fell NT$30 to NT$4,950 (-0.60%), Hon Hai (2317) dropped NT$3 to NT$251 (-1.18%), and Delta Electronics (2308) gave back NT$20 to NT$1,885. UMC (2303) was the lone big-cap semiconductor to hold flat at NT$161.50.
The slack was taken up by second-tier tech and old-economy cyclicals. Optical communication and networking names Lian Ya (3081), FOCI (3163) and Former (4908) all hit their 10% daily limits, as did passive-component maker Walsin Technology (2492) and PCB supplier Zhen Ding (4958), with Formosa Petrochemical (6505) adding solid gains. The sector tape tells the same story: the TWSE Semiconductor index managed only +0.18% while Shipping rose 0.81% and Financials & Insurance added 0.11%. Turnover was healthy at NT$898.17 billion (about US$28.1 billion).
The overnight setup helped. Wall Street staged an intraday V-shaped recovery on Thursday after dovish remarks from Fed Vice Chair Philip Jefferson pushed Treasury yields lower; the S&P 500 closed up 0.19% at 7,666.45 and the Philadelphia Semiconductor Index jumped 1.59% to 12,829.00, with Micron up more than 3% on strong earnings and AI memory demand. S&P 500 futures were up a further 0.32% at 7,748.50 during Taiwan hours.
Institutional flows: all three camps buying, trusts in front
Friday’s official TWSE data showed the three major institutional categories combined for a net purchase of NT$9.56 billion:
| Investor type | Net trading value (Oct 2) | Direction |
|---|---|---|
| Foreign investors | NT$+2.62B | Net buy |
| Investment trusts | NT$+4.91B | Net buy |
| Dealers (prop + hedge) | NT$+2.03B | Net buy |
| Combined | NT$+9.56B | Net buy |
Domestic investment trusts led for a change, consistent with the day’s small- and mid-cap flavor. The dealer figure was NT$4.74 billion of direct proprietary buying partly offset by NT$2.72 billion of hedging sales. Foreign buying was modest but positive — notable on a day their favorite large caps fell, implying the inflow went down the cap spectrum.
Positioning and leverage: three channels, read separately
Derivatives positioning data lags by a session, so the latest TAIFEX figures describe Thursday, not Friday’s record close. As of Thursday, foreign investors held a net open interest of -79,554 TAIEX futures contracts (net volume -1,389 on the day), and the volume-based options put/call ratio stood at 91.11% — a sizable futures net short sitting against renewed cash-market buying. Friday’s update, due next session, will show whether that hedge is being unwound into the new high or maintained against it.
On leverage, Thursday’s market-wide margin purchase balance — the retail leveraged-long channel — rose NT$7.57 billion to NT$629.9 billion, a reminder that retail participation is expanding alongside the rally. In the institutional short channel, SBL balances rose in 405 shortable issues and fell in 443 on Thursday — close to balanced. The single-name detail is more interesting: TSMC’s SBL balance fell 415,000 shares to 14.20 million, so institutional shorts were covering the index heavyweight even before Friday’s dip, while UMC’s SBL balance rose 953,000 shares to 68.06 million and MediaTek’s added 187,472 shares. On the retail side, UMC also saw margin longs jump 6,246 lots — the crowd and the institutional shorts are squaring off in the same name.
FX and the ADR gap
The Taiwan dollar stayed on the defensive with the US Dollar Index holding above 102, with USD/TWD at 31.86 at Friday’s close on our feed — essentially flat, though spot traded with a weakening bias through the Taipei session. TSMC’s ADR closed Thursday in New York at $459.20, roughly 17.1% above Friday’s Taipei close on a share-adjusted basis. That premium is structural — it has run roughly 15–25% in recent years given limited fungibility — and the two closes come from different sessions, so the level itself is not a signal; at around 17% the gap currently sits in the middle of its recent range.
What to watch
- Friday’s TAIFEX positioning, published next session: whether the foreign futures net short of -79,554 contracts narrows to confirm the cash-market buying, or persists as a hedge against the record high.
- Breadth durability: the record was built on limit-ups in optical communication, passive components and PCBs. Watch whether rotation broadens further or whether the index needs TSMC and MediaTek to re-engage above NT$2,500 and NT$4,950.
- Retail leverage: margin balances rose NT$7.57 billion to NT$629.9 billion through Thursday; a continued climb into record territory is the gauge to track for froth in the mid-cap segment now leading the tape.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.