The institutional division of Infinox has suspended the new institutional trading activities of numerous contracts for differences (CFD) brokers, citing suspicious and potential breaches of market conduct standards, FinanceMagnates.com learned. The liquidity provider even halted the withdrawals of at least one broker. This is an updated version of an earlier article, incorporating the company’s statement.Join IG, CMC, and Robinhood in London’s leading trading industry event!Infinox’s Letter to BrokersA letter sent to one of the brokers and reviewed by FinanceMagnates.com mentions that Infinox is “fully investigating” certain trades of the brokers after they were flagged by external auditors.The prime broker's letter also cited that the "Caluse 5" of its client agreement allows it to temporarily suspend the new trades of its clients if there is an ongoing investigation under concerns of regulatory and compliance obligations."Recently, our trading activity was suspended without explanation, withdrawals were blocked, and open positions left unmanaged," Farimah Zabihi, Business Development Manager at ScoreCM, wrote in a LinkedIn post. "The only reference given was Clause 5.1 of the client agreement, which provides no justification for such action."Infinox, however, highlighted in the letter that the brokers’ existing open positions remain unaffected."The fact is that we identified trading activity that was manipulative, abusive, and incompatible with the expected standards of fairness and transparency," an Infinox representative told FinianceMagnates.com. "As a regulated and responsible brokerage, we have both a legal and ethical duty to act when such behaviour is uncovered. In this instance, our actions have been entirely consistent with the terms accepted by all parties and carried out in strict accordance with our regulatory obligations"."We acted swiftly and decisively to protect the integrity of our platform, the interests of our clients, and the reputation we have built as a trusted global firm. We will not tolerate manipulation, corruption, exploitation, or bad-faith trading behaviour, and we will continue to defend our values, our clients, and our standing in the market with absolute determination." Brokers Are “Concerned and Anxious”Infinox, which also operates in retail, offers liquidity and technology to other CFD brokers. A sudden suspension of these services could severely impact the affected brokers’ day-to-day operations.If any broker has only one liquidity provider, such a decision could also bring their operations to a standstill.Several recipients of the letter have raised concerns after Infinox suspended their activities and are now anxious about their operations. Several brokers also claim that the move has affected their operations."We are working closely with our legal counsel and relevant authorities to ensure these matters are resolved appropriately through the proper channels," the Infinox representative added. "While it would be inappropriate to comment on individual accounts or proceedings at this stage, we stand by every decision we have taken - each one grounded in evidence, process, and principle."Infinox offers its prime services under the IXO Prime brand, which is regulated by the authorities in Mauritius and Anguilla, according to the company’s website.Earlier this year, Infinox revealed that its revenue for the period between January and April 2025 increased by 233 per cent year on year but did not disclose an absolute figure.Infinox Global also appointed Lee Holmes as its Chief Executive earlier this year.FinanceMagnates.com reached out to Infinox regarding its decision to suspend the activities of multiple brokers but did not receive a response as of press time.This article was written by Arnab Shome at www.financemagnates.com.