Shares of Japan's SoftBank Group resumed their slide on Friday, following a broader slump in AI-related stocks as investors once again grew wary of the sector's lofty valuations.

The group, which holds a wide range of AI investments across infrastructure, semiconductor, and application companies, saw shares drop more than 8%.

This comes after SoftBank gained nearly 3% in the previous session, having plunged 10% on Wednesday to clock its worst day since April. It stares at about $53 billion market cap wipeout this week and its worst weekly loss since March 2020, if Friday's losses hold.

"SoftBank Group's shares are falling as many bought it as the only listed proxy for OpenAI," said David Gibson, senior research analyst at financial services firm MST Financial.

The pullback re

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