The Securities and Exchange Board of India has taken interim action against two entities accused of manipulating the Sensex closing price during the Closing Auction Session on August 13. The regulator has barred CLOPTAL Mauritius and Mansi Share from accessing the securities market and from participating in the Closing Auction Session going forward, alleging both used aggressive buying and selling in Sensex constituent stocks to influence the closing price and potentially profit from their expiry-day Sensex options positions.
What SEBI Alleges Happened
According to SEBI, the trading activity of both entities was linked to movements in the Sensex Indicative Equilibrium Price (IEP), and the regulator has prima facie concluded that the cash-market orders placed were connected to their derivatives positions, essentially, an attempt to influence price discovery in a way that could generate wrongful gains through options.
CLOPTAL Mauritius: Aggressive Buying, Then Mass Cancellations
SEBI alleges that CLOPTAL Mauritius placed buy orders in various Sensex constituent stocks at prices roughly 3% above the reference price. During the first price spike, CLOPTAL reportedly accounted for a striking 99.91% of the total buy-order value, and 96.09% during a second spike. In another related window, its share of buy-order value stood at 85.21%.
The regulator says CLOPTAL then cancelled buy orders worth approximately ₹98.12 crore, activity SEBI alleges was specifically intended to influence the Sensex IEP. Based on this pattern, SEBI has estimated CLOPTAL's alleged wrongful gains at ₹2.96 crore.
Mansi Share: A Mirror Image on the Sell Side
Mansi Share, meanwhile, is accused of the opposite tactic, placing aggressive sell orders across eight Sensex constituent stocks, covering a total of 12.65 lakh shares. Of these, around 7.05 lakh shares were reportedly offered at prices 2.5% below the reference price. SEBI says the entity subsequently cancelled all 12.65 lakh shares' worth of sell orders, a pattern the regulator has again linked to its expiry-day Sensex options positions, estimating Mansi Share's alleged wrongful gains at approximately ₹71.65 lakh.
Combined Impact and SEBI's Interim Measures
Together, the two entities' alleged wrongful gains total around ₹3.68 crore. SEBI has ordered this amount impounded, to be held in fixed deposits with a lien in the regulator's favour while further proceedings continue. Under the interim directions, both entities are barred from accessing the securities market and from participating in future Closing Auction Sessions, and SEBI has directed banks to restrict debit transactions from their accounts, barring specifically permitted exceptions.
SEBI said these interim measures were necessary to protect fair price discovery and preserve the integrity of the securities market. The regulator has prima facie held that the alleged conduct falls under Section 12A of the SEBI Act and Regulations 3 and 4 of the Prevention of Fraudulent and Unfair Trade Practices Regulations.
Why This Matters Beyond These Two Cases
The action reflects a broader pattern of intensifying regulatory scrutiny around trading activity on expiry days, particularly cases where cash-market transactions might be used to influence prices that directly affect derivatives positions. The Closing Auction Session exists specifically to support orderly, transparent price discovery, and SEBI's allegations here illustrate exactly the kind of distortion the mechanism is designed to prevent: placing large orders purely to move the indicative price, then cancelling them once the intended effect has been achieved.
It's worth stating clearly that SEBI's interim action is not, by itself, a final finding of wrongdoing. The allegations against CLOPTAL Mauritius and Mansi Share rest on the regulator's prima facie assessment at this stage, with further proceedings expected to determine the final outcome. The case nonetheless signals SEBI's growing focus on order behaviour, closing-price formation, and the connections between cash-market activity and expiry-day derivatives trading.
FAQs
Q1. What are CLOPTAL Mauritius and Mansi Share accused of?
Both are accused of placing aggressive orders in Sensex constituent stocks, buy orders in CLOPTAL's case and sell orders in Mansi Share's, to influence the Sensex closing price during the August 13 Closing Auction Session, then cancelling those orders after the price moved.
Q2. How much in alleged wrongful gains has SEBI identified?
Around ₹3.68 crore combined, ₹2.96 crore attributed to CLOPTAL Mauritius and ₹71.65 lakh to Mansi Share.
Q3. What interim action has SEBI taken?
Both entities are barred from accessing the securities market and from participating in the Closing Auction Session, with the alleged wrongful gains impounded and banks directed to restrict debit transactions from their accounts.
Q4. Does this mean SEBI has proven the entities are guilty?
No. SEBI's interim action reflects a prima facie assessment, not a final finding. Further regulatory proceedings will determine the ultimate outcome.