City Index is a global provider of spread betting, contracts for difference (CFD) trading and foreign exchange (FX) trading services. Founded in the United Kingdom in 1983, it currently operates as part of the Nasdaq-listed financial services group StoneX Group. City Index serves retail clients globally, holding regulatory licences from the Financial Conduct Authority (FCA) in the UK, the Australian Securities and Investments Commission (ASIC) in Australia, the Cyprus Securities and Exchange Commission (CySEC), the Monetary Authority of Singapore (MAS), and the UAE's Securities and Commodities Authority (SCA). Initially focusing on spread betting, City Index expanded its services from the early 2000s, acquiring several other brokerage businesses and establishing international offices in Asia and Australia. The company experienced substantial financial difficulties during the 2008 financial crisis, leading to restructuring and eventual acquisition by GAIN Capital in 2014. GAIN Capital itself was later acquired by StoneX Group in 2020, making City Index part of StoneX's retail brokerage division.
In 2001, City Index introduced contracts for difference (CFD). In 2005, it acquired IFX Group, owner of FX broker IFX Markets and spread betting provider Finspreads, a London-based company founded in 1999. The Finspreads brand was relaunched in January 2013 but ceased operations on 24 March 2018, when all existing Finspreads accounts were migrated into City Index. In 2006, the company opened offices in Sydney, Singapore, and Shanghai to serve clients across the Asia Pacific region.
In 2008, City Index acquired US-based FX Solutions, the New Jersey-based FX broker. In October 2009, it launched the City Trading app, the first spread betting and CFD mobile platform for the iPhone, later expanding to Android and BlackBerry.
During the 2008 financial crisis, Spencer provided a £70 million capital injection to stabilize the company after significant trading losses. Despite this, in March 2009 City Index briefly breached its banking covenants.
In November 2014, GAIN Capital, owner of Forex.com, acquired City Index for approximately $118 million. At the time, City Index reported annual revenue of $124.8 million and adjusted earnings of $10.7 million but carried net operating losses of around $65 million. The merged company had roughly 235,000 clients in 180 countries with annual trading volumes exceeding $3 trillion.
GAIN Capital had attracted acquisition interest from several bidders since mid-2019. In June 2020, INTL FCStone (later renamed StoneX Group) made an acquisition offer at $6 per share, valuing the deal at approximately $236 million. Due to GAIN Capital's strong recent performance, including Q2 2020 net revenue of $101 million, many shareholders considered the offer undervalued, and some supported an alternative proposal by JB Capital at $6.25 per share. Despite this shareholder opposition, the deal with INTL FCStone was eventually finalized. The acquisition was also marked by an insider trading scandal involving Joseph Conlan, a former financial services executive at GAIN Capital. Conlan learned confidential details about the pending acquisition from a friend employed at StoneX and purchased GAIN Capital shares ahead of the public announcement. The case concluded with Conlan agreeing to a cease-and-desist order and paying $159,389 to settle regulatory charges.
Following the acquisition by StoneX Group, City Index became part of StoneX's global retail brokerage division. Under the new ownership, City Index UK's legal entity was renamed StoneX Financial Ltd, though the City Index brand continued to operate specifically for retail customers. In 2022, City Index underwent a rebranding and updated its trading platforms to include Advantage Web Trader, TradingView, and MetaTrader 4.
In April 2025, City Index Singapore transitioned to Forex.com, another StoneX subsidiary. On 30 August 2025, City Index's Australian operations were rebranded to Forex.com as StoneX moved to consolidate its retail trading businesses under a single global brand. At the same time, StoneX made changes to its regulatory structure: Gain Capital UK (City Index’s former parent company) obtained a Category 5 license from the UAE's Securities and Commodities Authority (SCA) in August 2025, with plans to transfer it to StoneX Financial Ltd and eventually surrender Gain's UK FCA licence. StoneX Financial Ltd (formerly City Index's UK entity) remains the primary FCA-authorised entity for City Index and FOREX.com in the UK.
In December 2021, City Index announced a three-year partnership with the Sydney Roosters, a professional Australian rugby league club, becoming the team's Platinum Partner. The sponsorship aimed to enhance brand visibility and recognition within the Australian market and the broader Asia-Pacific region.
In November 2023, ASIC required City Index Australia to compensate clients due to multiple weaknesses in change management procedures and errors in leverage ratio limits. This case was part of a broader regulatory initiative, with City Index contributing to an aggregate compensation exceeding AUD $17.4 million, shared among seven CFD issuers, including City Index.
Marketing and sponsorship
Controversies
The "Plumber and Spaniard" Scandal (2002–2006)
Compliance and reporting failures (2007–2011)
Platform exploitation incident (2011)
Regulatory issues in Australia (2012–2023)
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