This article provides a list of the major instrument classes from the perspective of financial engineering. These instruments are divided according the convention in financial markets.  As part of an operational programme, the Structural Funds may finance expenditure in respect of an operation comprising contributions to support financial engineering instruments for enterprises, primarily small and medium-sized ones, such as venture capital funds, guarantee funds and loan funds, and for urban development funds, that is, funds investing in public-private partnerships and other projects included in an integrated plan for sustainable urban development.