Company: Mercury Systems (MRCY)

Business: Mercury Systems is a manufacturer of essential components, products, modules and subsystems. The company sells them to defense prime contractors, the U.S. government and OEM commercial aerospace companies. Essentially, Mercury Systems makes the electronics that go into defense applications. Because it pays for its own research and development, it's not subject to the Truth in Negotiations Act that requires cost disclosure. This allows the company to have better than single-digit margins.

Stock Market Value: $2B ($34.38 per share)