Taiwan’s stock market staged a forceful rebound on Tuesday, with the TAIEX closing up 4.20% at 44,232.87 — recovering a meaningful slice of the record 2,953.71-point (6.47%) collapse of Friday, July 17, when aggressive unwinding of AI-related positions and retail margin debt swept through the market. The bounce was semiconductor-led and mirrored bargain-hunting across Asia, with attention shifting to upcoming U.S. technology earnings for evidence that AI capital spending is converting into revenue. But the flow data tells a more nuanced story than the headline suggests: this was a domestically funded rally.
The tape: semis do the heavy lifting
The TWSE Semiconductor sub-index rose 4.50%, outpacing the broad market, with Shipping up 3.71% and Financials & Insurance a comparatively muted +0.85%. Among the heavyweights at Tuesday’s close:
| Stock | Close (NT$) | Day | PER | PBR | Foreign ownership |
|---|---|---|---|---|---|
| TSMC (2330) | 2,410.00 | +3.88% | 31.19 | 10.21 | 69.33% |
| MediaTek (2454) | 3,670.00 | +9.88% | 53.23 | 13.66 | 55.57% |
| Hon Hai (2317) | 246.00 | +4.90% | 16.65 | 1.84 | 39.9% |
| UMC (2303) | 134.50 | +3.46% | 32.66 | 4.02 | 41.24% |
(Valuation ratios as of Monday’s TWSE close.) MediaTek’s near-10% surge was the standout, while TSMC’s 3.88% gain did the most index work. The Taiwan dollar firmed slightly, with USD/TWD at 32.26 (-0.15%) — no sign of currency stress accompanying the equity rebound.
Institutional flows: the domestic bid
Tuesday’s official TWSE flow data — this site’s signature read — shows the rebound was not foreign money returning:
- Foreign investors: NT$-4.33B — net SELLERS, even into a 4% up day
- Investment trusts: NT$+17.23B — net buyers, and by far the largest bid
- Dealers (proprietary + hedge): NT$+3.51B — net buyers
- Three institutions combined: NT$+16.41B net buy
Foreign accounts extended the selling that characterized last week, though at a far smaller scale. The rally was carried by domestic investment trusts, with dealer desks adding modestly. Whether foreign flows flip positive is the cleanest test of how durable this stabilization is.
Positioning and leverage (Monday’s data — Tuesday’s not yet published)
Derivatives and leverage figures below are from Monday, July 20 — they describe the setup into today’s session, not today’s positioning:
- TAIFEX futures: foreign investors carried a net short of 78,337 TX contracts into Tuesday, after modest net buying (+6,561 contracts) during Monday’s session.
- Options: put/call ratios of 82.72% (open interest) and 89.10% (volume) — a defensive posture as of Monday’s close.
- Retail leveraged longs (margin purchases): the market-wide margin loan balance fell NT$18.93B to NT$569.0B on Monday, continuing the deleveraging that accelerated through last week’s rout. Margin balances declined in all five names we track, led by UMC (-11,151 lots).
- Institutional shorts (SBL, distinct from retail margin shorts): securities-lending balances rose in 655 shortable issues versus falling in 290 on Monday — institutional short exposure was still broadening into the rebound. Hon Hai saw the largest single-name build (+1,463,000 shares), while UMC (-267,000) and MediaTek (-23,000) saw covering.
Taken together, the scoreboard describes a market that entered Tuesday with foreign accounts short futures, institutional short balances still growing, and retail leverage shrinking — a configuration in which a 4% rally can owe as much to positioning as to conviction. Tuesday’s TAIFEX prints, due tomorrow, will show whether that futures short was covered into the bounce.
ADRs and the overnight backdrop
TSMC’s U.S. ADRs closed Monday at $402.30, which stands about 7.7% above Tuesday’s Taipei close on a per-share basis. Two cautions: the closes are from different sessions, and the ADRs habitually trade at a structural premium — roughly 15-25% in recent years, given limited fungibility. The compressed gap largely reflects Taipei catching up on Tuesday to the strength the ADRs printed overnight; it is not an arbitrage signal. Tonight’s ADR session will show whether the gap re-widens toward its usual range.
The overnight U.S. setup was mildly constructive: the Philadelphia Semiconductor Index gained 0.60% on Monday while the S&P 500 slipped 0.19%, and S&P 500 futures traded up 0.54% during Asian hours, supporting risk appetite through the Taipei session.
What to watch
- Tuesday’s TAIFEX data (published tomorrow): did foreign investors cover any of the 78,337-contract net short in TX futures into the rebound, or lean against it?
- Flow follow-through: can investment trusts sustain a NT$17B-scale daily bid, and does foreign cash-market selling (NT$-4.33B today) fade or re-accelerate?
- U.S. tech earnings: the market is looking for concrete evidence that AI spending converts into revenue and profit growth — the key external variable for whether this stabilization holds.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.