Sensex Flash Crash of 2,000 Points in Six Minutes Prompts Calls for Probe
A 2,000-point Sensex crash in six minutes during cash-settled expiry drew accusations of manipulation on social media, with traders calling for SEBI and NSE investigation.
Alpha Score of 57 reflects moderate overall profile with weak momentum, strong value, moderate quality, moderate sentiment.
The Sensex dropped roughly 2,000 points in about six minutes during the weekly expiry of its derivatives contracts on Thursday, while the Nifty held relatively steady through the same window, a divergence that traders said pointed to a concentrated dislocation in the 30-stock basket rather than a broad market selloff.
On social media, traders called the move "pure daylight robbery" and urged the Securities and Exchange Board of India and the National Stock Exchange to investigate. "Everyone was warning them multiple times that CAS in the Indian markets could be destructive," one user wrote. "One of Asia's largest stock market is not a joke, or a game you can play however you feel like." Another user said the government should compensate those who lost money: "The govt should pay back everyone who made losses during CAS in the Sensex expiry today."
The episode hit during the final hour of the weekly Sensex expiry, which settles in cash rather than requiring physical delivery of shares. Critics have long warned that the structure, where a handful of contracts determine the settlement price for a broad index, can amplify moves when large positions unwind under thin liquidity. The divergence between the Sensex and the Nifty during the crash suggests the dislocation was specific to the basket of stocks that make up the 30-share Sensex, rather than a systemic event. The Nifty tracks a broader 50-stock index and is generally more liquid in its derivatives market.
SEBI and the NSE have not commented on the incident. The regulator has previously investigated flash moves during expiry sessions but has not altered the cash-settlement framework, which remains a feature of both Sensex and Nifty derivatives contracts.
Infosys Ltd, a component of both indices, carries an Alpha Score of 57 out of 100, labeled Moderate, reflecting the stock's balanced risk-reward profile relative to its technology sector peers. The company's stock page is available here.
Thursday's chaos adds to a running debate about whether India's derivatives market, which has grown rapidly in retail participation, needs tighter circuit breakers or a move away from cash-settled expiries for benchmark indices. The regulator's next steps will determine whether this episode becomes a catalyst for rule changes or another fine-collection exercise.
SEBI and the NSE have not commented on the incident.
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