An investment company that invests its shareholders' money in new business ventures that are risky but potentially very profitable.

a firm that specializes in financing new ventures with capital supplied by investors interested in speculative or high-risk investments that have the potential to provide them very high rates of return

a partnership that primarily invests the capital of third party investors in enterprises that are typically too risky for ordinary bank loans

Warrant

an interesting idea

a fund, which in many ways is like mutual fund