StoneX is not a broker in the sense most retail comparison sites use the word. It is a Nasdaq listed financial services group whose clients are mostly commercial firms, institutions and professional traders, and whose business includes physical commodities, securities, derivatives, foreign exchange and global payments. Asking whether StoneX is reliable is the wrong question until you know which StoneX company you would be dealing with.
That distinction is not pedantry. The group operates through a dozen or more regulated subsidiaries, each with its own supervisor, its own permissions and its own client type. The protections you get depend entirely on which one signs your agreement.
A listed group, not a single brokerage
StoneX Group Inc. trades on Nasdaq under the ticker SNEX and is headquartered at 230 Park Avenue in New York. The company traces its listed lineage to 1924 and, by its own account, has been publicly traded since 1994. Through the years it operated as International Assets Holding Corporation and then, after 2011, as INTL FCStone Inc.
The name changed in 2020 when the group acquired GAIN Capital Holdings, the owner of the retail brands FOREX.com and City Index. That acquisition brought a self-directed client base into a business that had been built around commercial hedging and institutional execution, and the parent rebranded as StoneX across its customer facing subsidiaries.
Being listed matters for diligence. Quarterly and annual filings on SEC EDGAR show the group's financial position, risk factors and segment results, which is a level of disclosure no private offshore broker provides.
Look at the balance sheet, then look at the entity.
The subsidiaries and who supervises them
StoneX Financial Inc., usually abbreviated SFI, is the main US operating company. It is registered with the SEC as a broker dealer and with the CFTC as a futures commission merchant and commodity trading adviser, and it is a member of FINRA, the NFA, SIPC and the MSRB. Securities business runs through its BD division and listed futures through its FCM division.
StoneX Markets LLC handles OTC and swap business. It is an NFA member and is provisionally registered with the CFTC as a swap dealer, and its products are offered only to counterparties that qualify as eligible contract participants under CFTC rules. Retail clients cannot use that entity at all.
Outside the United States the pattern repeats. StoneX Financial Ltd is registered in England and Wales under company number 5616586 and is authorised by the Financial Conduct Authority under firm reference number 446717; it is also a category one ring dealing member of the London Metal Exchange. StoneX Financial Pte Ltd is regulated by the Monetary Authority of Singapore under registration 201130598R. StoneX Financial (HK) Limited holds SFC licence BCQ152. StoneX Financial Pty Ltd holds Australian financial services licence 345646 under ACN 141 774 727. StoneX Financial Europe GmbH is authorised by BaFin under reference 161361. StoneX Financial (Canada) Inc. is a member of CIRO and CIPF.
Two wealth entities, SA Stone Wealth Management Inc. and SA Stone Investment Advisors Inc., sit alongside the trading businesses as a FINRA member and an SEC registered adviser respectively.
The FCA entity serves professionals only
The UK permission is worth reading carefully. StoneX Financial Ltd is authorised to arrange, execute and where required clear derivative transactions, along with certain OTC products, securities, precious metals and payment services, and the firm states that these are provided to professional and eligible customers. That is not a retail authorisation in the way a spread betting firm's is.
The firm also says plainly that it engages in physically delivered commodities business and other activities that are unregulated and not required to be authorised. Any client assuming that every StoneX activity in the UK is FCA supervised is mistaken, and the disclosure is unusual enough to be worth crediting.
What the group actually sells
The product list reads differently from a retail broker's. Alongside execution and clearing in listed derivatives, the group trades physical commodities, runs global payment services in more than a hundred currencies, provides OTC hedging and market making, and publishes a market intelligence platform built on its own trading desks. The business is organised across commercial, institutional, self-directed retail and payments segments, and the commercial and institutional work dominates.
StoneX Pro is the institutional facing platform, aimed at clients who need direct market access, market depth and routing control. Scale figures the company cites include more than 54,000 institutional and professional clients and over 260,000 self-directed retail accounts, spread across dozens of offices on six continents.
The acquisitions that shape the current group are worth listing, because they explain why a single brand covers such different businesses. Sterne Agee arrived in 2017 and expanded clearing and custody. GAIN Capital in 2020 added the retail forex and CFD brands. Chasing Returns and a minority stake in Tigress Partners followed in 2021, Cotton Distributors in 2022, and a Paris based agricultural broker, Plantureux et Associés, was acquired by the European entity in late 2025. Agricultural commodities are a recurring theme, which tells you where the group sees durable revenue.
Retail forex sits in the GAIN Capital brands
This is where a lot of confusion originates. MetaTrader, cTrader and retail style forex accounts are not offered by StoneX Financial Inc. They live in the brands that came with GAIN Capital: FOREX.com and City Index, the latter being one of the older UK spread betting and CFD names. Those brands carry their own regulatory permissions and their own client money rules.
A reader who signs with StoneX Financial expecting a 100 dollar retail CFD account will not get one. A reader who signs with FOREX.com is dealing with a different entity under a different part of the group, and the account agreement will say so.
R.J. O'Brien changed the scale in 2025
On 31 July 2025 StoneX completed its acquisition of RTS Investor Corp., the parent of R.J. O'Brien, one of the oldest independent futures brokerages in the United States. The consideration was 610,566,926 dollars in cash plus 3,085,554 shares of StoneX common stock, with the cash figure adjusted for tangible book value above an agreed benchmark.
The group's annual report describes it as the largest acquisition the company has made, adding more than 26,000 clients and around 200 introducing brokers and positioning StoneX as the largest non bank FCM in the United States. R.J. O'Brien itself was founded in 1914, so the combination joins two firms with more than a century of futures history each. Integration work was still in progress when the annual report was published.
For a client, the practical effect is broader clearing reach and a deeper product set. It is also a reminder that the group changes shape regularly through acquisition, so the entity you checked last year may not be the one you deal with today.
What we could not verify
Some claims about this group circulate on review sites and do not hold up. We found no primary support for the statement that StoneX live accounts are limited to US residents, given the number of regulated non US subsidiaries. We could not verify a 2003 founding date, which conflicts with the company's own account of a business dating to 1924. We also found no evidence that the institutional entity offers MetaTrader or cTrader, because those platforms sit with the retail brands.
Our searches did not identify a public enforcement action that would change the picture above. Absence of a published action is not the same as a clean record, and it should be checked per entity rather than per brand.
Checking a StoneX entity before you trade
Every regulator involved here publishes a free search tool. FINRA BrokerCheck covers StoneX Financial Inc. and SA Stone Wealth Management, showing registrations, disclosures and arbitrations. NFA BASIC covers the futures and swap entities, including StoneX Markets LLC, and lists disciplinary history. The FCA register is searchable by firm reference number 446717 and shows exactly what the UK entity is permitted to do.
For other jurisdictions, use the local register: ASIC for licence 345646, MAS for the Singapore entity, the SFC public register for CE number BCQ152, and BaFin for the German firm. Then open the account agreement and confirm that the entity named in it is the one you looked up.
Derivatives, swaps and margin products carry substantial risk of loss and are not suitable for every participant. Read the risk disclosures attached to the specific entity and product, because they differ across the group.