Apollo Micro Systems, founded in 1985, specialises in electronics and electromechanical solutions for aerospace, defence and space. On Monday, its shares surged 9% to a record ₹212.55, with volumes quadrupling. This small-cap company, with a market cap of over ₹6,000 crore, has delivered multibagger returns of 1,650% in three years and 1,800% in five years, attracting increased FIIs investment.