CXMT is stoking fears that its blockbuster stock market debut could pull cash from China's equities.

The outsized premium was due in part to offshore investors who, locked out of the highly anticipated listings, turned to crypto for a parallel market.

China's largest memory chipmaker, ChangXin Memory Technologies (CXMT), is set to debut on the Shanghai Stock Exchange after raising $8.6 billion in Asia's biggest IPO this year,…