The TAIEX climbed 693.47 points, or 1.51%, to close at 46,551.13 on Friday, September 4, on turnover of NT$825.6 billion. The session sealed a weekly gain of 219.68 points — the benchmark’s second consecutive positive week — and the defining feature was unambiguous: foreign money. Overseas investors net bought NT$56.21 billion of Taiwan shares in the cash market, the bulk of a NT$62.87 billion combined institutional net purchase, while the Taiwan dollar firmed alongside the inflow.
Flows: foreign investors do the heavy lifting
| Institutional category | Net trading value (Sep 4) |
|---|---|
| Foreign investors | +NT$56.21B (net buy) |
| Investment trusts | +NT$0.29B |
| Dealers (proprietary + hedge) | +NT$6.37B |
| Three institutions combined | +NT$62.87B |
Domestic trusts were essentially flat and dealer buying was modest, so this was a foreign-driven tape. The currency confirmed it: USD/TWD was quoted at 31.65 on September 4, down 0.24%, after opening at 31.72 and trading a 31.65–31.80 intraday band as the dollar index eased.
Semis and AI hardware lead the advance
| Name | Close (NT$) | Change |
|---|---|---|
| TSMC (2330) | 2,410.00 | +0.84% |
| Hon Hai (2317) | 256.00 | +3.43% |
| MediaTek (2454) | 4,415.00 | +1.73% |
| UMC (2303) | 130.00 | +4.00% |
TSMC’s NT$20 gain anchored the index, but the breadth of the move was in the AI hardware supply chain: Hon Hai rose 3.43% on institutional inflows into server assembly, and rotation drove limit-up moves in thermal cooling suppliers such as Auras and Asia Vital Components and in passive component makers including Yageo and Walsin Technology. Among the big caps, UMC’s 4% jump stands out — at Thursday’s close it traded on a PER of 18.8 against MediaTek’s 71.7 and TSMC’s 27.7, giving the foundry laggard a value catch-up flavor. By sector index, Financials & Insurance rose 1.17%, Semiconductors 1.09% and Shipping 0.70%, so the bid extended beyond tech.
One cross-market note: TSMC’s ADR closed at $417.01 in Thursday’s US session, about 9.5% above Friday’s Taipei close on an ADR-equivalent basis — below the roughly 15–25% structural premium seen in recent years. The two closes span different sessions and Friday’s Taipei rally mechanically narrowed the gap, so the level itself is not a signal; the thing to watch is how the gap moves in tonight’s ADR session.
Positioning: retail trims leverage, institutional shorts build selectively
Taiwan’s three leverage and short channels told different stories in Thursday’s data (the latest published; Friday’s figures come out next session):
- Retail leveraged longs (margin purchases): the market-wide margin loan balance stood at NT$578.7 billion as of Thursday, down NT$6.94 billion on the day. Margin balances fell across all five bellwethers we track — UMC by 14,371 lots, MediaTek by 223 lots — so retail is deleveraging into strength, not chasing it.
- Institutional shorts (SBL): securities-lending balances rose in 512 shortable issues versus falls in 339 on Thursday. MediaTek’s SBL balance climbed 85,000 shares and TSMC’s 11,000, a modest institutional lean against the IC design rally, while UMC’s fell 292,000 shares and Hon Hai’s edged lower.
- Retail margin shorts in the large caps remained negligible — TSMC’s short balance was just 26 lots.
Taken together, this is not a stretched setup: heavy foreign cash buying, shrinking retail leverage, and only selective institutional short builds.
Backdrop: Wall Street rebound and dovish Fed talk
Friday’s session followed a strong Thursday on Wall Street, where the S&P 500 added 1.06% to 7,747.71, the Nasdaq climbed 1.40% and the Dow gained 1.18% to 53,686.11. Notably, the Philadelphia Semiconductor Index rose only 0.11% to 11,352.13 — Taipei’s semiconductor move ran well ahead of its US counterpart. Risk appetite was supported by Fed Governor Christopher Waller’s remarks backing a September rate pause and by AI sentiment following Nvidia’s acquisition of Hugging Face. S&P 500 futures were roughly flat at 7,758.50 during Asian hours, offering no pushback to the regional rally.
What to watch
- September 10 monthly revenue filings: Taiwan-listed companies, TSMC included, must report August sales within six days — the next hard data point for the AI hardware narrative.
- Foreign flow and the TWD: whether the NT$56.21 billion single-day foreign purchase extends into next week, and whether USD/TWD presses below 31.65.
- The SBL tape: if institutional short balances in MediaTek and TSMC keep building against falling retail margin debt, it would signal institutions fading the IC design leg of this rally.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.