The TAIEX briefly breached the 46,000 mark before profit-taking pared the gain to 0.10% at 45,857. Foreign investors bought a net NT$45.45B for a sixth straight session, while MediaTek’s 3.8% slide capped the semiconductor complex. Shipping surged 4%.
Taiwan’s TAIEX touched an all-time intraday high of 46,402.60 before afternoon selling in TSMC and the electronics heavyweights dragged it down 0.46% to 45,811.01. Despite the reversal, foreign investors finished the session as net buyers of NT$45.35 billion in the cash market, on NT$1.06 trillion turnover.
The TAIEX rose 1.11% to 46,021.48 on Thursday, a fourth straight gain, as a cool US CPI print and a 2.49% SOX rally powered semiconductors. Foreign investors net bought NT$75.69 billion in the cash market, MediaTek jumped 5.23%, and Hon Hai bucked the tape.
TAIFEX publishes foreign investors’ net open interest in TAIEX futures and the options put/call OI ratio every trading day — but a large negative net OI is usually a hedge, not a bearish bet. Here is how to read both gauges, with a worked example from real August 2026 data, the practitioner heuristics and their limits, and the divergences that matter.
TSMC reported July 2026 revenue of NT$467.6 billion, up 5.6% from June and 44.7% from a year earlier — ahead of its 37.0% year-to-date pace. Hon Hai, Delta and UMC also posted strong months, while MediaTek slid 16.4% from June.
The TAIEX closed at 45,518.07 on Wednesday, up 0.88%, as TSMC’s record NT$467.58 billion July revenue and a fresh capex approval lifted the tech complex. All three institutional groups were net buyers, led by NT$11.02 billion of foreign inflows, with the US CPI print looming overnight.
Taipei reversed an early 276-point drop to close up 0.43% at 45,120.72 on Tuesday, defying a 2.94% overnight slide in the Philadelphia Semiconductor Index. Foreign investors net bought NT$22.33 billion, MediaTek and TSMC led the recovery, and passive-component names went limit-up on AI server demand.
Taiwan stocks jumped 702.85 points Monday as foreign investors swung back to a NT$51.71B net buy, UMC surged 6%, and TSMC filed a record NT$467.58B July revenue on filing-deadline day.
Taiwan’s benchmark faded from an early push past 44,800 to close at 44,225.91 on Friday, down 0.38%, as foreign investors sold a net NT$40.72 billion in the cash market. TSMC edged higher against the tide; UMC fell 4.5%. Monthly revenue filings land Monday.
Taiwan’s TAIEX fell 0.48% to 44,396.70 on Thursday as TSMC and MediaTek gave back part of Wednesday’s 1,250-point surge. Investment trusts bought NT$8.86B while foreigners were marginal net buyers in the cash market; rotation lifted memory and cooling names even as the heavyweights sagged.