CH. Karnchang Public Company Limited (Trairatvorakul family controlled), Thai major construction/infrastructure (Bangkok mass transit, Xayaburi hydropower Laos), has faced sustained Thai SEC regulatory enforcement scrutiny over multiple Thai/Lao construction project sites including the historic Xayaburi hydropower (Mekong River) environmental disputes affecting downstream communities and the contested 2024 sustained share price volatility affecting Thai institutional shareholders.