The company operates in six areas: commercial hedging, global payments, securities, physical commodities, foreign exchange and clearing and execution services (CES).

INTL's subsidiary, StoneX Group Inc. (previously FCStone LLC), took over HCEnergy's business and customers.

The transaction expanded StoneX Group Inc.’s energy risk portfolio to include greater capability in crude oil and refined products.

A year later, the company announced plans to expand network coverage into the four major commodities: metals, agriculture, energy and softs.

The agreement gave advisors using FCStone Financial access to thousands of UCITS funds without having to sign individual contracts with each strategies’ manager or distributor.

[27] In December 2018, StoneX announced that it would be acquiring GMP's US-based fixed-income trading business, formerly known as Miller Tabak Roberts Securities, LLC.

[32] In February 2020, StoneX announced the acquisition of U.S.-based brokerage GAIN Capital Holdings Inc., primarily known as the operator of retail brands FOREX.com globally and City Index in the UK.

StoneX Group Inc. (previously FCStone Group) provided integrated risk management services such as market intelligence and analysis to help commodity traders in industries like agriculture, renewable fuels, energy, food service, carbon credits, and forest products.

StoneX executed more than 100 million derivative contracts in 2008 and was a clearing member on all major US future exchanges.

The company started in Winter Park, Florida in 1981 and was headed by Diego J. Veitia, a graduate of the Thunderbird School of Global Management.

IAAC then turned its attention to high-net-worth clients, including individuals and financial institutions, and diversifying their investment portfolios through the sales of equity securities and global debt.

IAHC transitioned into becoming a market maker of international equity securities in the early 2000s and is now a global financial services provider operating through wholly owned subsidiaries in the US, Dubai, Singapore, Argentina, the UK, Brazil, and Uruguay.

[38] In 2009, StoneX Group Inc. (previously INTL FCStone) and the International Assets Holding Corporation merged with Sean O'Connor became CEO and Diego Veitia Chairman.

[39] Within a month of the merger, IAHC expanded operations to the Pacific Rim with a new office in Sydney, Australia.