What explains heightened foreign investor activity on May 31?

The Congress party alleges insider trading by foreigners ahead of the BJP’s predicted victory in the exit polls on May 31, resulting in a surge in stock market activity. FPIs made significant purchases linked to the MSCI’s quarterly rebalancing, impacting global indices and passive funds. The Congress party alleges insider trading by foreigners ahead of the BJP’s predicted victory in the exit polls on May 31, resulting in a surge in stock market activity. FPIs made significant purchases linked to the MSCI’s quarterly rebalancing, impacting global indices and passive funds.  Economic Times