Taiwan’s benchmark TAIEX fell 0.99% to 49,313.44 at Thursday’s 1:30 p.m. close, pulling back from this week’s record territory as investors took profits below the psychological 50,000-point threshold and squared books ahead of the National Day holiday break. The tone was set overnight: the Philadelphia Semiconductor Index dropped 1.15% in Wednesday’s US session and the S&P 500 eased 0.22% on renewed Treasury-yield and inflation worries, and Taipei’s chip complex followed through from the open.
Chips lead the pullback
| Stock | Thursday close (NT$) | Change |
|---|---|---|
| TSMC (2330) | 2,550.00 | -1.35% |
| MediaTek (2454) | 4,690.00 | -3.00% |
| Hon Hai (2317) | 249.00 | -1.19% |
| UMC (2303) | 147.50 | -0.67% |
MediaTek was the weakest of the big four, while TSMC’s 1.35% decline looked like straightforward profit-taking: the company has been in its pre-earnings quiet period since October 5 ahead of the October 15 conference call, leaving the tape without fresh catalysts. Notably, the official TWSE sector indices told a different story — the Semiconductor sub-index finished up 1.18% and Financials & Insurance gained 1.68%, with Shipping flat at +0.05% — suggesting Thursday’s damage was concentrated in the largest index weights while mid-cap names in the same sectors held their ground or rallied.
Institutional flows: foreigners sell hard
The flow picture was unambiguous. Foreign investors net sold NT$75.85 billion in the cash market on Thursday — a heavy single-day figure that did most of the index damage given their 69.19% ownership of TSMC. Investment trusts leaned the other way with NT$4.69 billion of net buying, while dealers (proprietary plus hedge books) net sold NT$18.73 billion. The three institutional groups combined were net sellers of NT$89.90 billion on the day.
In derivatives — where Thursday’s data is not yet published, so these are Wednesday’s figures — foreign investors carried a net short position of 79,101 TAIEX futures contracts into the session, and the volume-based options put/call ratio stood at 94.57%. That pre-existing futures short is context for how foreigners were set up coming in, not a read on what they did Thursday; the updated positioning lands with the next TAIFEX release.
Leverage and the short channels
Taiwan’s three leverage channels moved in different directions, and they are worth keeping separate. Retail leveraged longs (margin purchases) edged up NT$2.34 billion to NT$640.0 billion market-wide as of Wednesday — retail is still adding, not deleveraging. Within the retail channel, margin balances fell in TSMC (-222 lots) and Hon Hai (-1,108 lots) but rose in UMC (+1,748 lots).
The institutional short channel — securities lending (SBL) balances, as of Wednesday — showed a split tape: balances rose in 412 shortable issues and fell in 441. The single-name detail is more interesting: TSMC’s SBL balance fell by 1,115,000 shares, a modest covering signal in the index heavyweight, while institutional shorts added to Hon Hai (+3,173,000 shares), UMC (+4,871,406 shares) and MediaTek (+223,000 shares). Shorts are rotating down the cap scale rather than pressing the leader.
ADR gap and the currency
TSMC’s US-listed ADR closed Wednesday at $472.20, which works out to an 18.3% premium over Thursday’s Taipei close. Two reminders apply: the ADR premium is structural — it has run roughly 15–25% in recent years owing to limited fungibility — and the two closes come from different sessions. At 18.3% the gap sits in the middle of its recent range; it is the day-to-day change in this spread that carries information, not the level, and nothing here signals mispricing.
The Taiwan dollar weakened alongside the equity outflow, with USD/TWD up 0.43% and quoted at 31.91 on Thursday — a consistent pairing with NT$75.85 billion of foreign cash-market selling. Overnight risk appetite remained soft, with S&P 500 futures down 0.29% at 7,830.25 during Taipei hours.
What to watch
- Saturday, October 10 — monthly revenue filings. Taiwan-listed companies, TSMC included, must file September sales by this date. With the local market closed for the holiday, those numbers will shape the reopening session.
- October 15 — TSMC earnings call. The quiet period ends with the third-quarter conference call; Thursday’s selling reads largely as de-risking into that event.
- Post-holiday positioning data. Thursday’s TAIFEX foreign futures open interest and put/call figures publish next; whether the 79,101-contract net short grew alongside the NT$75.85 billion cash sale is the first thing to check at the reopen.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.