New F&O Rules to Limit Retail Losses

Futures and Options are financial contracts that let you bet on whether a stock or index will rise or fall. They use leverage, meaning you can take large positions with relatively less capital. When trades go wrong, losses can exceed your initial investment quickly.

SEBI introduced the following changes in phases from November 2024 to April 2025:

1. Minimum contract size raised to Rs 15 lakh to Rs 20 lakh from the earlier Rs 5 lakh to Rs 10 lakh. Traders need significantly more capital per position than before. Read our guide on the minimum capital required for F&O trading in India to understand what this means for your trading account.
2. Weekly expiries cut to one per benchmark index per exchange. Earlier, traders could simultaneously trade weekly expiries on Nifty, Bank Nifty, FinNifty, and MidCap Nifty. Now each exchange offers weekly expiry on only one index, reducing expiry-driven speculation every week.
3. 2 per cent Extra Loss Margin on short options on expiry day. Short options positions on the day of expiry now carry an additional 2 per cent margin to cover sharp price swings near expiry.
4. Full option premium paid upfront from February 1, 2025. Brokers can no longer extend credit for option purchases. You pay the complete premium before the trade goes through.
5. The calendar spread margin benefit is removed on the expiry day. If one leg of a calendar spread expires that day, the margin relief for the other leg is no longer available.
6. Intraday position limit monitoring from April 1, 2025. Exchanges now check whether traders are breaching position limits during the trading day, not only at the end of the day. See how F&O ban stocks, and MWPL rules work in this context.

Delta-Based Position Limits: What Most Traders Have Not Adjusted For

Earlier, SEBI measured your F&O exposure by counting the number of lots you held. 10 Nifty lots meant 10 lots of exposure, regardless of whether you held futures or options.

Now SEBI measures exposure using delta. Delta is a number between 0 and 1 that tells you how much an options contract will move for every one-point move in the underlying index. A Nifty futures contract has a delta of 1 because it moves exactly in line with the index. A deep out-of-the-money call option might carry a delta of 0.10, meaning it moves 10 paise for every Rs 1 move in the index.

A worked example: You hold 10 Nifty call options with a delta of 0.30 each. Your total delta equivalent exposure is 3 lots, not 10. Under the old system, you were counted as holding 10 lots. Under the delta-based measurement, SEBI counts your exposure as 3 lots equivalent. This frees up position limit headroom for traders who hold low delta options.

The actual limits SEBI has set:

At the entity level, the net delta exposure cap for index options is Rs 1,500 crore. The gross long or short delta exposure cap is Rs 10,000 crore. These limits apply primarily to large traders, HNIs, and proprietary desks. For most small retail traders, these absolute caps are not immediately constraining, but understanding your delta exposure is now a basic requirement for trading in India. These limits came into effect from October 2025 as notified in SEBI’s circular on the administration of stock exchanges.

Your broker’s risk management screen now shows both lot count and delta equivalent exposure. Track both numbers, not just one.

Revised Index Derivative Lot Sizes From December 2025

SEBI revised lot sizes for major index contracts to keep the overall contract value in the Rs 15 lakh to Rs 20 lakh band as index prices moved higher. See the full updated breakdown in Alice Blue’s dedicated blog on Nifty and Bank Nifty lot sizes 2026:

Existing contracts continued until their expiry under old lot sizes. New contracts use the revised lot sizes. Always verify the current lot size on your broker’s platform before placing a trade.

T Plus Zero Settlement: Same Day Shares and Funds

Under the T+1 system, shares bought on Monday arrive in your demat account on Tuesday. Under T plus zero, they arrive the same day.

SEBI launched a pilot in March 2024 with 25 stocks. From January 31, 2025, T plus zero expanded to the top 500 stocks by market capitalisation, added in batches of 100 per month. Institutional investors and block trades were brought into the T+Zero framework from May 2025.

Step by step for a retail investor:

You place a buy order before 1:30 PM under the T plus zero option. Your broker routes it to the T plus zero segment. By 4:30 PM, the shares are credited to your demat account, and funds are debited from your bank.

T plus zero is optional; you can still use T plus 1 if you prefer. Your broker must be enrolled to offer it, and not every broker has implemented it yet. SEBI has confirmed it will keep T plus zero optional until systemic readiness across custodians, clearing corporations, and brokers is confirmed. Check the full context of this rollout in Alice Blue’s coverage of the NSE T plus zero settlement update.

Algorithmic Trading Rules: Fully in Force From April 2026

As of April 1, 2026, SEBI’s algo trading rules are fully mandatory for all stock brokers across India. Every broker must now comply; there are no more extended timelines. For a foundational understanding of how algo trading works, read Alice Blue’s guide on what is algo trading.

Here is what the current framework requires:

• The 10 orders per second threshold. If your trading frequency through an API is below 10 orders per second, you are classified as a regular API user and do not need to register as an algorithmic trader. If your trading frequency crosses 10 orders per second, those strategies must be registered as algorithms with the exchange.
• Exchange registration for all algo tools. Every algorithm must be registered with the stock exchange and carry a unique identifier. Regulators can trace every automated trade back to its algorithm and owner.
• Research Analyst license for third-party providers. If you use a third party algo strategy provider, that provider must hold a valid Research Analyst license from SEBI and publish periodic performance reports on their strategies. Using a provider who does not meet this requirement puts your account at compliance risk.
• Broker accountability. Brokers are responsible for all algo tools offered to their clients. Two-factor authentication is mandatory for all API access. See how Alice Blue has structured its own algo trading partnerships with Tradetron and Quantman to comply with the new framework. The primary SEBI circular governing this framework is available on the SEBI algo trading circular page.

SEBI Stock Brokers Regulations 2026: The Change That Protects Your Money

On January 7, 2026, SEBI notified the SEBI (Stock Brokers) Regulations, 2026. This replaced the 34-year-old 1992 regulations and is one of the most direct structural protections SEBI has introduced for retail investors in recent years.

Three changes from this regulation matter directly to you:

• Client fund segregation is now mandatory. Brokers must maintain a strict legal separation between client funds and their own operating funds. If your broker faces financial difficulties, your money in the trading account cannot be used to cover the broker’s own obligations. This is a direct protection against broker default risk.
• Every broker must appoint a dedicated Compliance Officer. This person is legally responsible for investor grievance redressal at the broker level. You now have a named point of escalation if your broker fails to resolve your complaint before the matter reaches SEBI.
• Quarterly compliance reviews are mandatory. Every registered broker must conduct and submit a formal compliance review every quarter, increasing the frequency of oversight compared to the earlier annual review model.

Specialised Investment Funds: A New Option Between Mutual Funds and PMS

In early 2025, SEBI introduced Specialised Investment Funds, or SIFs. They sit between mutual funds and Portfolio Management Services in terms of flexibility and minimum investment.

If you are a salaried investor with Rs 10 lakh to Rs 40 lakh in savings who wants more flexibility than a mutual fund offers but does not yet have Rs 50 lakh for PMS, an SIF is a relevant option. Fund houses launched specific SIF products through 2025 and 2026. You can also read Alice Blue’s blog on SEBI Mutual Fund Rules 2026 for related context on how SEBI is reshaping the mutual fund category alongside SIFs.

Regulated Market for Pre IPO Shares

Earlier, buying shares in a company before it listed on a stock exchange meant using the grey market,  informal deals through unregulated intermediaries with no legal protection.

SEBI introduced a regulated platform for trading unlisted shares. For ESOP holders and early investors in startups, this creates a legal and traceable way to sell shares before an IPO. Transactions are recorded under exchange rules, price discovery becomes transparent, and fraud risk drops significantly. For a complete guide on how IPO regulations work from allotment to listing, read Alice Blue’s blog on SEBI IPO regulations in India.

Faster IPO Listing: T Plus 6 to T Plus 3

SEBI shortened the time between an IPO closing and shares getting listed from 6 working days to 3 working days. If you applied and did not get an allotment, your blocked funds return 3 days earlier. If you received shares, you can trade them 3 days after the IPO closes. Alice Blue has a full breakdown of exactly how this works in the SEBI T plus 3 IPO rule guide.