Arbitrage Trading

Arbitrage trading is the practice of simultaneously buying and selling the same asset (or equivalent assets) in different markets to profit from price discrepancies. In an efficient market, these discrepancies are small and short-lived, but arbitrage traders equipped with fast systems and low costs can consistently capture these risk-free or near-risk-free profits.

What Is Arbitrage?

Pure arbitrage is buying an asset at a lower price in one market and simultaneously selling it at a higher price in another. Since both trades happen at the same time, the risk of price movement is eliminated. The profit is the price difference minus transaction costs.

In practice, most arbitrage in financial markets involves some residual risk and is called “risk arbitrage” or “near arbitrage.”

Types of Arbitrage in Indian Markets

**Cash-futures arbitrage:**
When Nifty Futures trade at a premium to the Nifty Spot index, traders buy the spot basket (all Nifty stocks in proportion) and sell futures. They earn the premium (spread) as the futures converge to spot at expiry. This is the most common arbitrage strategy in India.

**Inter-exchange arbitrage:**
When a stock trades at a slightly different price on NSE vs BSE simultaneously (rare and short-lived).

**ETF-NAV arbitrage:**
When an ETF’s market price deviates from its Net Asset Value (NAV), authorised participants buy the cheaper and sell the more expensive, bringing prices in line.

**Statistical arbitrage:**
Pairs of historically correlated stocks that temporarily diverge; long the lagging stock, short the leading one.

Arbitrage Mutual Funds

Arbitrage funds in India primarily use cash-futures arbitrage. They are taxed like equity mutual funds (15% STCG, 10% LTCG above Rs 1 lakh) because they maintain 65%+ equity exposure. This makes them attractive for investors in high tax brackets who want liquid, low-risk investment with equity tax treatment.

Practical Example

Nifty 50 spot is at 22,000. Nifty April Futures are at 22,150 (premium of 150 points). An arbitrage fund buys the Nifty 50 stocks in correct proportion for Rs 1 crore and simultaneously sells Nifty April Futures worth Rs 1 crore. At April expiry, futures converge to spot. The fund earns Rs 1.5 lakh (150 points x 1 crore / 22,000) in approximately 1 month, roughly 1.5% (annualised 18%) with minimal risk.

Key Takeaways

– Arbitrage exploits simultaneous price differences for the same asset across markets
– Cash-futures arbitrage (buying Nifty stocks, selling futures) is the primary strategy in Indian arbitrage funds
– Arbitrage mutual funds are taxed as equity funds, making them efficient for high-tax-bracket investors
– True arbitrage is risk-free; statistical arbitrage carries convergence risk
– Returns from arbitrage are generally close to short-term deposit rates but with equity tax treatment