NSE & BSE

India's two primary stock exchanges — how they work, their differences, and how to trade on them.

India has two major stock exchanges: the Bombay Stock Exchange (BSE), established in 1875 and Asia's oldest, and the National Stock Exchange (NSE), founded in 1992. Together they form the backbone of India's capital markets. BSE hosts over 5,000 listed companies; NSE is the world's largest derivatives exchange by contract volume.

BSE vs NSE: Key Differences

While both exchanges list similar companies, there are meaningful differences in their products and market share.

Feature	BSE (Bombay SE)	NSE (National SE)
Founded	1875	1992
Benchmark Index	SENSEX (30 stocks)	NIFTY 50 (50 stocks)
Listed Companies	5,500+	2,000+
Trading Volume	Lower (cash equity)	Higher (dominant in F&O)
Derivatives	Limited F&O	World's largest by contracts
Settlement	T+1 rolling	T+1 rolling

Trading Hours and Sessions

Indian markets follow a structured trading schedule with different sessions for different purposes.

Pre-open session: 9:00 AM – 9:15 AM (order collection and price discovery)
Regular market: 9:15 AM – 3:30 PM IST (main trading session)
Post-close session: 3:40 PM – 4:00 PM (block deals and order modification)
Currency derivatives: 9:00 AM – 5:00 PM IST
Commodity derivatives (MCX): 9:00 AM – 11:30 PM IST (extending to global markets)

Key Indices

India has numerous indices tracking different market segments. These are the most important.

NIFTY 50: Top 50 large-cap companies by free-float market cap — the primary benchmark
SENSEX: Top 30 BSE-listed companies — the oldest and most globally recognised Indian index
NIFTY Bank: 12 most liquid banking stocks — highly traded for F&O
NIFTY Next 50: The next tier of large-caps after NIFTY 50
NIFTY Midcap 150 / Smallcap 250: Broader market coverage

Circuit Breakers and Market-Wide Limits

SEBI has circuit breaker rules that halt trading when markets move sharply, preventing panic-driven crashes.

10% move: 45-minute trading halt (15-minute halt after 2:30 PM)
15% move: 1 hour 45-minute halt (2-hour halt after 1 PM; remainder of day if after 2 PM)
20% move: Markets closed for the rest of the trading day
Individual stocks also have upper/lower circuit limits (5%, 10%, 20% depending on category)

Key Takeaways

✓NSE dominates equity derivatives; BSE leads in currency derivatives
✓Nifty 50 (NSE) is the primary benchmark for Indian equity market performance
✓Both exchanges use the same T+1 settlement cycle as of 2023
✓India markets trade 9:15 AM – 3:30 PM IST on weekdays excluding public holidays
✓Circuit breakers exist to prevent extreme market-wide crashes — a SEBI-mandated safety mechanism