A counterparty is the other party involved in a financial transaction or contract. In trading, when you buy a security, the counterparty is the entity selling it to you. Counterparty relationships exist in all financial transactions, from simple stock trades to complex derivative contracts. Understanding counterparty risk is crucial for risk management and regulatory compliance.

Counterparty risk, also known as default risk, represents the possibility that the other party will fail to fulfill their contractual obligations. This risk varies depending on the counterparty’s creditworthiness, the transaction type, and market conditions. Central clearing houses and collateral requirements help mitigate counterparty risk in many modern financial markets.

Real-world example: When trading an over-the-counter currency swap with a major bank, the bank serves as your counterparty, and you face the risk that the bank might default on its payment obligations during the contract term.