Since the stock value of Tata Motors has increased so much, doesn’t it make sense to decrease its lot size. Who decides when to increase/decrease lot size ? (According to current market price of around Rs.350 and 5700 lot size of tata motors, the contract value comes around a whopping 20lakh rupees…It is just ridiculous!!!)
There is periodic review of Market Lot size of securities and if any contract is below 5 lakhs or over 10 lakhs, there is upward or downward revision. This is done every 6 months or so, and the last revision was done in October 2020.
You can refer to this post for more information on this: Revision in Market Lot of Derivative Contracts of 28 Stocks
Is it decided by the NSE or SEBI ?
Revision will be done by the exchange.