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.
Large-capitalization (large-cap) stock. The stock of companies with market capitalizations typically of $10 billion or more is known as large-cap stock. Market cap is figured by multiplying the number of either the outstanding or floating shares by the current share price.