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.
3. Use to diversify an international stock allocation and express a view on small-cap stocks. The iShares MSCI EAFE Small-Cap ETF seeks to track the investment results of an index composed of small-capitalization developed market equities, excluding the U.S. and Canada.