Immunization is a very common investment strategy in finance, called IMM for short. Some bonds and interest rate swap contracts have fixed cash inflows and outflows, usually once every six months. In order to prevent future interest rate fluctuations from bringing unnecessary risks, investors can use IMM to balance these fixed cash flows to ensure a stable return on investment.

In the foreign exchange market, IMM is usually used to indicate the maturity date of some important international currency pairs. These due dates usually refer to the third Friday of the next month. IMM contracts have standardized trading rules and settlement rules, which enable investors to conduct foreign exchange transactions more efficiently and transparently.

IMM can also refer to the index and option market. Standard monthly contract is an exchange of stock index futures and options to measure market sentiment, and its nature and trading methods are standardized. IMM contracts include Standard & Poor's 500 index options and Nasdaq index options. For investors and traders, this standard index contract is a powerful trading tool.