Indonesia's rupiah IDR= and the Philippine peso PHP= weakened slightly, trading at 17,713 and 61.708 per dollar respectively.
Concerns over Indonesia's fiscal health following MSCI's measures were further elevated after data revealed on Friday that its current account deficit widened to 3.3% of gross domestic product in the second quarter.
The South Korean won KRW=KFTC demonstrated resilience, briefly climbing to 1,376.50 per dollar, its highest level since mid-September, 2025. The currency, with help from a weaker U.S. dollar, gained support ahead of Bank of Korea's rate decision later this week where a 25 basis point tightening is expected.
Investors also expect the won to draw support from Samsung Electronics 005930.KS and SK Hynix's 000660.KS large shareholder return programmes, as related dollar-to-won conversions could boost demand for the local currency.
Samsung's record $79 billion shareholder-return plan, however, disappointed investors and sent its shares falling 8.7% and dragged South Korea's KOSPI .KS11 3.1% lower.
Stocks elsewhere trended lower. Taiwan's .TWII equity benchmark shed over 1%, while Indonesian stocks .JKSE lost 0.5%.
Thailand stocks .SETI shed 0.9%, although its currency, historically linked to gold prices, gained to 32.6425 per dollar. The Bank of Thailand will meet later this week, with an interest rate hold widely expected.
Philippines stocks .PSI added 0.2%, ahead of the Bangko Sentral ng Pilipinas' meeting later this week, with the central bank also widely expected to hike rates by 25 basis points.
Vietnam stocks .VNI extended gains, adding 1%, after global index provider FTSE Russell said it would upgrade Vietnam to emerging market status from frontier in September.
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