SEBI Bars Two Entities for CAS Trade Manipulation

What is the Closing Auction Session?

• The CAS is a short window at the end of the trading day, used to discover a single closing price for stocks that have derivative contracts. Instead of averaging trades over 30 minutes, it collects all buy and sell orders and matches them at one equilibrium price.
• Why the closing price matters so much: it settles derivatives contracts. An option that would expire worthless at one closing price can become profitable at a slightly different one. That gives anyone holding derivative positions a reason to try nudging the close — and a short, concentrated window is where a large order moves the price most cheaply.

What the Alleged Manipulation Involved

• According to SEBI’s earlier findings, both entities placed very large orders and then cancelled them within seconds.
• The tactic is known as spoofing — placing orders with no intention of letting them execute, purely to move the price, then withdrawing them.
• This allowed the entities to avoid losses or make gains on derivatives positions that would otherwise have expired worthless.

Important Facts for Exams

• SEBI is the regulator of India’s securities markets, established under the SEBI Act, 1992, headquartered in Mumbai
• Impounding means SEBI takes custody of the money identified as wrongful gain, pending final proceedings
• Proprietary trading is when a broking firm trades using its own money, as distinct from executing trades for clients
• Spoofing is prohibited under SEBI’s PFUTP Regulations — Prohibition of Fraudulent and Unfair Trade Practices