(Bloomberg) -- China has banned major institutional investors from reducing equity holdings at the open and close of each trading day, part of the government’s most forceful attempt yet to prop up the nation’s $8.6 trillion stock market.Most Read from BloombergYour 401(k) Will Be Gone Within a DecadeLargest Covid Vaccine Study Yet Finds Links to Health ConditionsCapital One to Buy Discover for $35 Billion in Top 2024 DealUS Tells Allies Russia May Launch Anti-Satellite Nuclear Weapon Into Space