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By Shivangi Lahiri

July 20 (Reuters) - Most emerging Asian equities lost ground on Monday, led by a 5% drop in South Korean shares as the AI trade unravelled further, while a widening Gulf conflict pushed oil prices higher and rekindled inflation worries across the region.

Seoul shares .KS11 closed down 4.5% after sliding as much as 5.1% as markets reopened after Friday's holiday, taking the benchmark KOSPI's losses for the month to more than 22% and pushing it firmly into bear-market territory.

Taiwan's tech-heavy index .TWII rose as much as 1% before erasing gains to close down 0.5%.

The MSCI EM Asia equities index .MIMS00000PUS slipped to its lowest since early May in the session. The South Korean and Taiwanese benchmark gauges together account for about 60% of the index.

"Investors now are reassessing the sustainability of AI capex demand in the longer term, and Korea, which produces AI memory chips for data centres, are more sensitive to changes in market sentiment," said Kelvin Lam, senior China economist at Pantheon Macroeconomics.

Citi analysts cut Korea to "neutral" in their EM country allocation from the "overweight" rating the country has had since July 2025, citing volatile trading conditions even as the market continues to rank strongly in their fundamentals-based models.

Jason Lui, head of APAC equity derivative strategy at BNP Paribas, said the latest moves suggested investors may be unwinding a once-popular "long North Asia, short South Asia" strategy, as concerns over crowded AI exposure prompt a reassessment of regional positioning.

It has brought renewed attention to markets such as India, Indonesia and China, though Lui cautioned the shift may reflect defensive repositioning rather than a durable rotation away from North Asian technology plays.

In Southeast Asia, stocks in Jakarta .JKSE rose as much as 1.2% to their highest point since mid-June, and stocks in Manila .PSI clocked similar gains to hit their highest level since March 3.

India's equities .NSEI were down around 0.7%.

Among currencies in the region, the Indonesian rupiah IDR= weakened to 17,991 against the dollar at open, before strengthening to as much as 17,960.

Markets are also turning their attention to Bank Indonesia's policy meeting later this week, where the central bank is expected to raise rates for a fourth time in an effort to stabilize the rupiah.

The Thai baht THB=TH weakened to as much as 33.715 per dollar, hitting its lowest since late April 2025.

The currency has been pressured by low carry and a weakening current account, Maybank analysts said, adding they expect it to remain among the region's weaker performers this month with few supportive catalysts. The baht has fallen 1.2% in July so far.

HIGHLIGHTS:

** Japan markets closed for a public holiday

** Yield on Indonesia's 10-year bonds ID10YT=RR unchanged at 7.267%

** China leaves benchmark lending rates unchanged for 14th consecutive month in July

** Indonesian parliament panel gives go-ahead to financial centres plan

Asia stock indexes and currencies at 0650 GMT
COUNTRY	FX RIC	FX DAILY %	FX YTD %	INDEX	STOCKS DAILY %	STOCKS YTD %
Japan	JPY=	-	-3.52	.N225	-	23.75
China	CNY=CFXS	+0.04	+3.19	.SSEC	-0.32	-5.46
India	INR=IN	-0.24	-6.88	.NSEI	-0.65	-7.47
Indonesia	IDR=	-0.42	-7.18	.JKSE	0.81	-28.00
Malaysia	MYR=	+0.02	-0.81	.KLSE	-0.36	2.69
Philippines	PHP=	-0.20	-4.65	.PSI	0.82	6.66
S.Korea	KRW=KFTC	+0.51	-2.63	.KS11	-4.46	54.63
Singapore	SGD=	+0.05	-0.40	.STI	-0.29	18.24
Taiwan	TWD=TP	-0.03	-2.67	.TWII	-0.52	46.56
Thailand	THB=	-0.15	-6.54	.SETI	-0.13	29.95