Definition of mosquito for English Language Learners. : a small flying insect that bites the skin of people and animals and sucks their blood.
What it is: Small-cap stock refers to a company with a market capitalization (calculated by taking a firm's current share price and multiplying that figure by the total number of shares outstanding) near the low end of the publicly traded spectrum.
What is a Microcap Stock? Microcap stocks are smaller companies, and often are high-risk investments. A microcap (or micro-cap) stock is generally defined as a relatively small company with a market capitalization greater than $50 million, but less than $300 million.