Its peak $100 billion valuation once made it the world's third largest privately-held company, behind TikTok owner Bytedance and Elon Musk's SpaceX. Estimates have pegged Shein's IPO valuation at around $90 billion, Bloomberg reported last year. AdvertisementTo gauge what happens to some Shein items once they're returned, BI reporters in the UK put two AirTag trackers on Shein garments and sent them back. Shein is more directly involved in production and focuses on clothes, but Temu's popularity "could affect the valuation," Swartz said. In a November statement following the news of Shein's IPO, chairman Mike Gallagher urged investors and banks underwriting the move to "carefully examine Shein's regulatory and compliance programs."

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