The Indian stock market has changed a lot in the last few years. A big reason behind this change is the work done by SEBI. The full form of SEBI is the Securities and Exchange Board of India. It controls and regulates the stock market in India. Its main goal is to protect investors and make sure the market works in a fair and transparent way.
Over time, SEBI introduced many important rules and reforms. Some of these changes improved safety for investors, some reduced market manipulation, and others made trading faster and more efficient. Many policies directly changed the way traders, brokers, investors, and companies operate in the market today.
Here are ten major SEBI policy changes that had a huge impact on the Indian financial market.
T+1 Settlement Made Trading Much Faster
One of the biggest changes came when SEBI introduced the T+1 settlement cycle between 2022 and 2023. Earlier, India followed the T+2 settlement system. This meant that when someone bought or sold shares, the final settlement happened after two business days.
After the new rule, settlement started happening within one business day. This made India one of the fastest major stock markets in the world. Investors received shares and money much quicker than before. Faster settlement also reduced risk because deals closed sooner. This policy improved liquidity and brought more confidence among retail investors.
Peak Margin Rules Reduced Excessive Leverage
In 2020 and 2021, SEBI introduced peak margin rules. Before this change, traders often used very high leverage during the day. Brokers allowed traders to take huge positions with very little money.
The new system forced traders to maintain margin requirements during the entire trading session instead of only at market close. Because of this, traders needed more capital to place large trades.
This policy changed intraday trading in a major way. Many high-frequency traders left the market because leverage reduced sharply. Brokerage firms also saw lower trading volumes. Even though traders disliked the rule, it made the market safer and reduced unnecessary risk.
ASM and GSM Rules Controlled Stock Manipulation
Stock manipulation has always been a major problem in smaller companies and penny stocks. To stop this issue, SEBI introduced surveillance systems called ASM and GSM.
ASM means Additional Surveillance Measures while GSM stands for Graded Surveillance Measures. These systems track unusual activity in stocks that show suspicious price movement.
After this rule came into effect, many artificially inflated stocks crashed heavily. It became difficult for market operators to run pump-and-dump schemes. Investors slowly became more protected from fake price rallies. This reform improved trust in smaller stocks and reduced manipulation across the market.
Mutual Fund Reforms Changed Investor Behavior
SEBI also introduced reforms in the mutual fund industry. One major step forced fund companies to clearly separate direct plans and regular plans.
Before this, many investors paid high commissions without fully understanding the difference. Regular plans involved distributors who earned commission while direct plans usually cost less.
After this change, investors started learning more about costs and returns. Many people moved toward direct plans because they wanted better long-term gains. This policy also helped digital investment platforms grow rapidly. It changed how people approached mutual fund investing in India.
ASBA System Made IPO Investment Safer
SEBI made the ASBA system mandatory for IPO applications. ASBA means Application Supported by Blocked Amount.
Before this rule, investors paid money directly when applying for an IPO. If shares were not allotted, refunds often took time.
Under the new system, money stayed blocked in the investor’s bank account instead of leaving immediately. Funds only moved after successful share allotment.
This created a much safer IPO process. Investors felt more comfortable because their money stayed secure during the application period. Trust in IPO investing improved significantly after this reform.
Algorithmic Trading Rules Increased Market Control
Algorithmic trading became very popular in India over the last few years. Many traders began using automated systems and broker APIs to place trades without manual action.
To control this growing activity, SEBI introduced stronger rules during 2025 and 2026. The regulator increased monitoring of retail algorithmic traders and placed more responsibility on brokers.
SEBI also brought restrictions on order-to-trade ratios. This stopped systems that placed too many orders within seconds.
The policy created a more controlled environment. While compliance costs increased for trading firms, the market became more stable and transparent.
F&O Restrictions Changed Retail Trading Habits
India has become one of the largest futures and options markets in the world. However, many retail traders started taking very risky positions without understanding the danger.
To control excessive speculation, SEBI tightened rules around futures and options trading. It increased margin requirements and improved market surveillance.
This policy forced traders to bring more capital before entering derivative positions. Small traders who depended on aggressive speculation found trading more difficult.
Although many traders disliked the stricter rules, this reform reduced reckless behavior. It pushed investors toward more disciplined trading habits.
UPI Block System Improved Fund Safety
In 2025, SEBI introduced the UPI block mechanism for secondary market trading. This system worked in a similar way to the ASBA process used in IPO applications.
Earlier, money moved directly to brokers when investors placed buy orders. Under the new method, funds remained blocked inside the bank account and moved only after trade execution.
This reduced the risk of brokers misusing client funds. Investors gained better control over their own money.
The change improved trust between brokers and retail traders. It also brought extra security to online stock trading in India.
Open Market Buybacks Returned in 2026
SEBI brought another important reform in June 2026 when it allowed open market buybacks once again.
Buyback happens when companies purchase their own shares from the market. Earlier, certain restrictions made this process difficult for listed companies.
The new rule allowed firms to buy back shares through stock exchanges with stricter safeguards in place. This gave companies more flexibility when they wanted to manage capital or support share prices.
The decision created positive sentiment because shareholders often benefit when companies buy back stock. It also improved corporate freedom in capital management.
Auction-Based Closing Price System Improved Transparency
In 2026, SEBI introduced another major market reform related to stock closing prices.
Earlier, closing prices depended mainly on volume weighted average price, also called VWAP. Some traders found ways to influence prices near market close.
To solve this issue, SEBI approved an auction-based closing system. Under this method, market participants take part in an auction session that helps decide the final stock price.
This created more transparent price discovery. Closing prices became harder to manipulate. This mattered because closing price affects derivatives settlement, mutual fund valuation, and institutional pricing.
The reform improved fairness during one of the most important moments of the trading day.
Final Thoughts
SEBI has played a major role in shaping the Indian stock market over the years. Its policies have not only improved investor safety but also changed the structure of trading itself.
Reforms like T+1 settlement improved speed. Peak margin rules reduced dangerous leverage. Surveillance systems stopped manipulation. Changes in derivatives trading brought better discipline. IPO reforms and UPI block systems protected investor money.
Each policy created a stronger and more trustworthy market environment. Some traders faced challenges because of stricter rules, but these reforms helped build a healthier financial system for the future.
India’s stock market today looks very different from what it was a few years ago, and SEBI remains one of the biggest reasons behind that transformation.
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