A record close, finished at the highs
The TAIEX ended Thursday, October 1 at 48,353.49, up 413.36 points or 0.86% — a new all-time closing high, and notably a close printed at the intraday high. The index opened firmer at 47,961.98 and built momentum through the session on turnover of NT$837.4 billion. The character of the day was familiar but emphatic: semiconductors led, the AI hardware supply chain broadened the move, and institutional money did the lifting.
TSMC (2330) rose NT$30, or 1.21%, to NT$2,510, matching its record closing high and doing most of the index-point work. MediaTek (2454) added 1.22% to NT$4,980 and Hon Hai (2317) gained 0.99% to NT$254. The standout among large caps was UMC (2303), up 4.53% to NT$161.50, with the wafer names in sympathy — GlobalWafers (6488) closed up 4.83% after touching limit-up intraday.
Institutional flows: broad-based net buying
All three institutional categories were buyers at Thursday’s close, per official TWSE data:
| Investor type | Net trading value (Oct 1) |
|---|---|
| Foreign investors | NT$+21.94B (net buy) |
| Investment trusts | NT$+5.66B (net buy) |
| Dealers (prop + hedge) | NT$+1.66B (net buy) |
| Combined | NT$+29.25B |
That NT$29.25 billion combined net purchase is the cleanest signal of the day. Foreign investors supplied the bulk of it, and the dealer figure nets NT$3.24 billion of direct purchases against NT$1.58 billion of hedging sales. With USD/TWD at 31.95 — the Taiwan dollar easing a modest 0.32% on the day — the currency was no obstacle to inflows.
Rotation: components on fire, financials steady
Beneath the record headline, the session’s heat was in components. Passive component makers staged a broad rally with more than ten stocks locked at the 10% daily limit, including Yageo (2327) and Walsin Technology (2492), on reports of Japanese competitors shifting capacity toward high-end AI server and automotive applications. ABF substrate names ran as well: Kinsus (3189) touched an intraday all-time high before closing up 4.00%, Nan Ya PCB (8046) climbed nearly 6%, and Unimicron (3037) gained over 3%.
By TWSE sector index, Semiconductors rose 1.15%, Financials & Insurance 0.84%, and Shipping 0.75% — a leadership board tilted toward tech, with the rotation selective rather than uniform. Among the assembly bellwethers, Quanta (2382) edged up 0.15% to NT$334 and Delta Electronics (2308) advanced 0.79% to NT$1,905.
Leverage and the short channels
Taiwan’s three leverage channels told slightly different stories as of Wednesday’s data (the latest published). Market-wide margin loans — retail leveraged longs — stood at NT$622.3 billion as of September 30, up a modest NT$3.60 billion on the session. Retail leverage is creeping higher into the record, not surging.
In the institutional short channel (SBL), the September 30 picture was mixed: balances rose in 385 shortable issues and fell in 487. At the single-name level, TSMC’s SBL balance fell 303,000 shares to 14.6 million, while UMC’s rose 1.72 million shares to 67.1 million and MediaTek’s rose 154,000 to 4.48 million. UMC is an interesting tension point: institutional short balances were building into Wednesday, retail margin longs there were shrinking (margin balance down 6,455 lots), and the stock then jumped 4.53% Thursday — a setup where fresh shorts are immediately underwater.
Derivatives positioning: a previous-session caveat
Thursday’s TAIFEX data was not yet available at the time of writing, so the positioning picture below describes Wednesday, September 30 — the latest published session. It did not cause Thursday’s move, but it frames it. Foreign investors held a net short of 78,151 contracts in TAIEX futures open interest as of Wednesday (with a small +846 net buy on that day’s volume), and the options put/call volume ratio sat at 99.20%, close to balanced. The standing feature here is the familiar one: heavy foreign cash buying alongside a large structural futures net short, much of which reflects hedging rather than a directional bet. Thursday’s TAIFEX prints, once published, will show whether that hedge was trimmed into the record close.
The ADR gap, for the record
TSMC’s ADR closed at $456.19 in Wednesday’s US session, roughly 16% above the equivalent Taipei close — but note this compares different sessions, and the ADR has carried a structural premium of roughly 15–25% in recent years owing to limited fungibility. The level is not a mispricing signal; only day-to-day changes in the gap carry information, and at around 16% the premium sits toward the low end of its recent range.
Backdrop
Wall Street’s Wednesday session offered tech-specific rather than broad support: the S&P 500 slipped 0.25% to 7,651.54 and the Philadelphia Semiconductor Index was flat at 12,628.62, while the Nasdaq rose 0.24%. Taipei clearly traded on its own drivers Thursday. S&P 500 futures were up 0.37% at 7,743.75 during Asian hours, a mildly supportive overnight setup.
What to watch
- Thursday’s TAIFEX prints (not yet published at time of writing): whether foreign investors trimmed the -78,151-contract futures net short into the record close, and where the put/call ratio moves from 99.20%.
- UMC’s short channel: SBL balances were rising into Wednesday; after Thursday’s 4.53% pop, watch whether institutional shorts cover or press.
- Follow-through in components: with ten-plus passive-component names limit-up, Friday’s open will show how much of the move was capacity-shift fundamentals versus one-day momentum.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.