SEBI
India's statutory capital markets regulator — the body that sets the rules for exchanges, brokers, listed companies, and every F&O contract you trade on NSE or BSE.
Definition
SEBI — the Securities and Exchange Board of India — is the statutory, quasi-judicial body established under the SEBI Act, 1992, to regulate and develop India's securities markets. It functions as the primary overseer of stock exchanges such as NSE and BSE, commodity exchanges like MCX, depositories, registrars, brokers, sub-brokers, portfolio managers, mutual funds, and listed companies. SEBI's three-part mandate is to protect investor interests, promote the development of securities markets, and regulate the market to prevent malpractice. Every instrument traded in Indian capital markets — equities, bonds, mutual fund units, and derivatives — falls under its jurisdiction.
Why it matters
For active traders and investors, SEBI's circulars translate directly into trading conditions. SEBI defines the SPAN margin and exposure margin frameworks that determine how much capital you must hold to carry an F&O position overnight. Its 2020 peak margin rules — which require brokers to collect upfront margin rather than relying on end-of-day calculations — fundamentally changed leverage availability for retail traders. SEBI periodically revises lot sizes, circuit breaker thresholds, and eligibility criteria for stocks entering or exiting the F&O segment. It also sets position limits (MWPL) on individual stock futures and options to prevent excessive concentration. When SEBI issues a new circular — on weekly expiry rationalisation, for instance — the derivatives market restructures almost immediately, affecting liquidity, premium levels, and strategy viability across the board.
How it works
SEBI operates through a board of members appointed by the Government of India and issues regulations, circulars, and guidelines that exchanges and intermediaries must implement. Enforcement actions — fines, trading suspensions, deregistration — are adjudicated through SEBI's internal quasi-judicial process, with appeals going to the Securities Appellate Tribunal (SAT) and then to the Supreme Court. Exchanges like NSE operate under SEBI oversight and must seek approval for new products, changes in contract specifications, and fee structures. Brokers are registered with SEBI and must comply with net-worth requirements, client fund segregation rules, and reporting obligations. SEBI coordinates with RBI (on currency and interest-rate derivatives), IRDAI (on insurance-linked products), and PFRDA (on pension-related securities) through the Financial Stability and Development Council.
Example
Suppose SEBI issues a circular mandating that brokers may offer options selling only after collecting 100% of the maximum potential loss as upfront margin, rather than a percentage. A trader who previously sold a Nifty 19,000 PE for ₹50 premium with ₹30,000 margin now needs to post the full theoretical loss — potentially several lakh rupees — before the position is accepted by the broker's risk management system. This is a hypothetical illustration of how a single SEBI circular changes practical leverage conditions across every retail F&O account in India without any change to the underlying exchange or instrument itself.
Trade within SEBI-compliant margin rules
TradePulse shows real-time option chain data including margin estimates so you can plan positions within current regulatory requirements.