Counterparty risk is the probability that the other party in a financial transaction — the counterparty — will default on its contractual obligations before the settlement or maturity of the contract, resulting in a financial loss for the non-defaulting party. It is a fundamental risk in all financial contracts including OTC derivatives (interest rate swaps, forward contracts, credit default swaps), bond transactions, securities lending, and margin lending arrangements. In exchange-traded markets like NSE and BSE, counterparty risk is largely eliminated by the central clearing counterparty — the National Securities Clearing Corporation (NSCCL) for NSE and the Indian Clearing Corporation (ICCL) for BSE — which interposes itself between buyers and sellers, guaranteeing settlement even if one party defaults. In OTC markets (forex forwards, interest rate swaps, bilateral lending), counterparty risk is managed through ISDA master agreements, netting arrangements, collateral posting (variation margin), and credit limits. The 2008 global financial crisis and India's IL&FS crisis (2018) highlighted how concentrated counterparty risk in interconnected financial systems can create systemic instability. For individual investors, counterparty risk manifests most directly through broker default risk — SEBI's client asset segregation rules, pledge-based margin, and SEBI-mandated investor protection funds at NSE and BSE provide partial protection.