A "sub" market within the Main Market of the London Stock Exchange (LSE) for innovative technology companies introduced in 1999. The FTSE techMARK Index Series is based on the technology stocks listed on the LSE's techMARK market. Additionally, techMARK mediscience is for companies whose business depends on innovation in the development or manufacture of pharmaceuticals, or products or services that are dedicated to the healthcare industry and it was introduced in 2001.