Securities and Exchange Board of India (SEBI) and Exchanges in order to enhance market integrity and safeguard the interest of investors, have introduced various enhanced pre-emptive surveillance measures such as reduction in price band, periodic call auctions, and transfer of securities to Trade for Trade segment from time to time.
In continuation to various surveillance measures already implemented, SEBI and Exchanges, pursuant to discussions in joint surveillance meetings, have decided that, along with the aforesaid measures, there shall be Enhanced Surveillance Measures (ESM) on Micro-Small Companies (on the main board with a market capitalization less than INR 500 crores) based on objective parameters viz. Price variation, Standard Deviation, etc.
The list of such securities identified under ESM shall be informed to the market participants from time to time and shall be available on the Exchange's website.
For more information on ESM, refer to the NSE FAQs here.