KCG Holdings, Inc. is a securities firm. The Company offers a range of services designed to address trading needs across asset classes, product types and time zones. The Company operates through three segments: Market Making, Global Execution Services and Corporate and Other. Its Market Making segment consists of market making in the cash, futures and options markets across global equities, options, fixed income, currencies and commodities. Its Global Execution Services segment comprises agency execution services and trading venues, offering trading in global equities, futures, options and fixed income to institutions, banks and broker dealers. Its Corporate and Other segment contains functions that support the Company's other segments, such as self-clearing services, including stock lending activities. It combines technology with client service across market making, agency execution and trading venues and engages in principal trading through exchange-based electronic market making.