Quantitative Research

TWSE Foreign Holding Weekly (Sep 18th): Wistron, TSMC, MediaTek, Nanya Technology, Nan Ya Plastics

18 Sep 2026 By Ke Yan, CFA
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Abstract: We analyzed foreign holdings of TWSE-listed stocks as of September 18th, covering securities with market cap above USD 100m. Total foreign holdings stood at USD 2,282bn, up from USD 2,268bn a week ago, a gain of USD 14bn or 0.6% week-on-week. We estimate net foreign inflows of USD 2,372m for the week, underperforming the TWSE index which rose 2.2% over the same period. On the inflow side, Wistron (3231 TT) led with +USD 1,305m, followed by MediaTek (2454 TT) at +USD 581m, Nanya Technology (2408 TT) at +USD 410m, Powerchip Semiconductor Manufacturing (6770 TT) at +USD 253m, and Alchip Technologies (3661 TT) at +USD 244m. The largest outflows were recorded in TSMC (2330 TT) at -USD 973m, Nan Ya Plastics (1303 TT) at -USD 294m, and Wiwynn (6669 TT) at -USD 280m.

Wistron (3231 TT) TSMC (2330 TT) MediaTek (2454 TT) Nan Ya Plastics (1303 TT) Nanya Technology (2408 TT)

Highlighted Stocks

Wistron, TSMC, MediaTek, Nan Ya Plastics, Nanya Technology

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