Basis Trading

Basis trading is an arbitrage or relative value strategy that exploits the price difference (the basis) between a futures contract and its underlying spot market asset — profiting from the convergence of futures and spot prices as the contract approaches its expiry date. The basis is defined as: Basis = Spot Price – Futures Price (or Futures Price – Spot Price, depending on convention). In a normally priced market (contango), futures trade at a premium to the spot, and the basis is negative — narrowing toward zero at expiry. A basis trader simultaneously holds opposing positions in the spot and futures markets — for example, buying the underlying index constituents in the cash market and selling the corresponding index futures — locking in the basis as a near risk-free spread that is earned as futures converge to spot at settlement. In Indian equity markets, basis trading forms the foundation of arbitrage mutual funds, which simultaneously buy Nifty 50 or stock positions in the cash segment and sell equivalent futures — earning the futures premium as rolling income. The strategy is nearly risk-free when executed on NSE-listed liquid stocks and index futures, since both legs are exchange-traded with central counterparty guarantee. The profitability of basis trading in India is directly linked to the level of speculative interest and leverage in the futures market — high futures premiums create more attractive basis trading opportunities.