Chips down in Philadelphia, bought in Taipei
Tuesday’s session was a study in divergence. The Philadelphia Semiconductor Index had fallen 2.94% overnight to 11,993.86 — pressured by Intel’s $15 billion capital raise announcement and declines in Nvidia — while the S&P 500 slipped a modest 0.06% to 7,753.11. Taipei opened accordingly, with the TAIEX down as much as 276 points in early trade, the weakness compounded by rising international oil prices. It didn’t last. Late-session dip-buying in the technology heavyweights carried the index to a close of 45,120.72, up 191.96 points or 0.43%, on healthy turnover of NT$869.02 billion. Overnight S&P 500 futures sitting essentially flat at 7,776 gave the afternoon bid room to work.
Institutional flows: foreigners buy the dip in size
The flow data explains the reversal better than anything else. All three institutional groups were net buyers on Tuesday, per official exchange figures:
- Foreign investors: net BUY of NT$22.33 billion
- Investment trusts: net buy of NT$3.39 billion
- Proprietary dealers: net buy of NT$2.46 billion
- Combined: NT$28.18 billion of net institutional buying
A NT$22 billion foreign net buy on a day when the US semiconductor complex had just been marked down 3% is a plain statement of intent: the money treated the overnight weakness as an entry point, not a warning.
Heavyweights: MediaTek leads, Hon Hai lags
| Stock | Close (NT$) | Change |
|---|---|---|
| TSMC (2330) | 2,395.00 | +0.63% |
| MediaTek (2454) | 4,020.00 | +1.52% |
| Hon Hai (2317) | 263.00 | −0.57% |
| UMC (2303) | 123.00 | unchanged |
| Delta Electronics (2308) | 1,805.00 | −NT$10 |
TSMC’s NT$15 gain did most of the index-level heavy lifting, with MediaTek’s NT$60 advance adding torque. The TWSE Semiconductor sub-index finished up 0.59% — a remarkable outcome given the overnight lead — while Financials & Insurance quietly outperformed at +1.13% and Shipping added 0.23%.
Passive components steal the session
The day’s real fireworks were in passive components. Walsin Technology (2492) locked limit-up at NT$300.5 after reporting July revenue of NT$4.444 billion, up 41.95% year-on-year and an eight-year high, with the sector citing a book-to-bill ratio of 1.8 driven by AI server power and voltage requirements. Peers Holy Stone (3026), Prosperity Dielectrics (6173) and Miin Woei (8043) also hit their limits, and the strength spilled into PCB makers including King-Jue (6213) and Tripod (3044). The underlying story — MLCC and resistor inventories tightening as hardware customers lock in long-term capacity agreements — is structural rather than a one-day trade.
Positioning: yesterday’s setup, not today’s cause
A note on the derivatives and leverage data, all of which reflects Monday’s session (Tuesday’s figures publish later): foreign investors carried a net short TAIEX futures open interest of 89,201 contracts into Tuesday, and the options put/call ratio stood at 117.38% on open interest (114.87% by volume). That was the defensive setup before Tuesday’s cash-market buying — whether the futures short gets pared in today’s release is now the interesting question, because NT$22 billion of foreign cash buying against a heavy futures short is a tension that usually resolves one way or the other.
On the leverage channels, kept properly separate: market-wide margin loan balances — retail leveraged longs — rose NT$7.63 billion to NT$545.3 billion as of Monday, so retail was adding exposure into the pullback. In the institutional short channel, SBL balances rose in 506 issues and fell in 349, but the direction in the large caps was covering: Hon Hai’s SBL balance dropped 8.01 million shares on the day, UMC’s fell 2.48 million, and TSMC’s slipped 216,000. MediaTek was the exception with a marginal 20,000-share increase. Taken together with the cash flows, the positioning scoreboard reads more like shorts stepping back than pressure building.
Currency and the ADR gap
The Taiwan dollar told the same inflow story, strengthening intraday to 32.174 per USD with interbank spot trading between 32.19 and 32.29 before finishing around 32.25. On the cross-listing front, TSMC’s ADR closed Monday in New York at $418.47, which puts the gap over the Taipei close at about 12.7% — toward the low end of the roughly 15–25% structural premium the ADRs have carried in recent years. As always, the two closes come from different sessions and limited fungibility keeps the premium persistent; it is the day-to-day drift in the gap, not its level, that carries information, and a gap at the low end of its range is worth noting after a US chip selloff.
What to watch
- Tuesday’s TAIFEX positioning release: whether foreign investors trimmed the 89,201-contract net futures short to match their NT$22.33 billion cash buying, or kept the hedge on.
- Passive-component follow-through: after a cluster of limit-ups, watch whether July revenue momentum in the MLCC chain sustains the bid or invites profit-taking.
- The TWD and foreign flows: a currency pressing toward 32.17 alongside sustained foreign buying would confirm capital rotating back into local assets; a stalling TWD would question it.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.