19% share price drop for Indian stock exchange BSE due to Sebi's new fee calculation method.

Indian stock exchange BSE experienced a 19% drop in its share price following new directives by market regulator Securities and Exchange Board of India (Sebi), requiring BSE to pay regulatory fees based on the "notional value" of its options contracts instead of on the premium value. This change is expected to increase BSE's regulatory fee payments to Sebi, potentially reducing its overall earnings by 15-18%.