Key Fund is a firm that provides finance to help communities and social enterprises to start-up, become sustainable, or grow. The firm provides financing in the form of flexible loans and grants. It invests between £5,000 and £150,000 in supporting working capital to pay for staff or overheads, growth and development, and contributing to the purchase and renovating of buildings. The firm invests in the creative, health, digital, housing, eco, and education and training sectors. Founded in 1999, the firm is based in Sheffield, United Kingdom.