SK Square is trading 4.11% down at KRW 747,000, amid concerns over the planned Solidigm U.S. IPO and parent-company shareholder protections. - On October 22, South Korea’s financial regulator said the listing falls under dual-listing guidelines. - The regulator said SK Square, as parent company, must meet shareholder-protection obligations; concerns also include potential value dilution at parent companies. - No company-specific earnings or other event was identified as the cause.