Court of Appeal quashes Christian Bittar's Euribor conviction: the rate-rigging era's legal reckoning and what it means for finance

One of the last remaining convictions from the benchmark rigging scandal has been overturned. On 9 October, the Court of Appeal in London quashed the conviction of Christian Bittar, a former Deutsche Bank trader who had pleaded guilty to conspiracy to defraud in connection with the Euribor interest rate benchmark, according to a statement reported by FX News Group. Jason Williams, head of division at the Serious Fraud Office, said the agency argued for a different outcome but respects the court's decision in relation to Bittar.

The ruling follows a series of decisions that have unwound the criminal legacy of the Libor and Euribor scandals. The Supreme Court earlier found that legal errors undermined the trials of former traders Tom Hayes and Carlo Palombo, and the Court of Appeal later quashed the convictions of five former Barclays traders. Bittar's case stood apart because he pleaded guilty rather than being convicted by a jury, which makes the outcome particularly notable.

Who Christian Bittar is

Bittar was a senior trader at Deutsche Bank and one of the most prominent figures in the Euribor investigation. Euribor, the euro interbank offered rate, is a benchmark used to price trillions of euros of loans, mortgages and derivatives. Prosecutors alleged that traders sought to influence submissions to the benchmark to benefit their trading positions.

He pleaded guilty and was sentenced in 2018 to five years and four months in prison, according to reports at the time. He was also ordered to pay the SFO's costs of about 800,000 pounds and faced a confiscation order of 2.5 million pounds. The UK's Financial Conduct Authority separately banned him from the industry in 2018.

The guilty plea had made his case different from those of defendants who contested the charges at trial. Prosecutors had been expected to oppose his appeal even after they stopped opposing the appeals of jury-convicted defendants. The FX News Group report did not set out the court's grounds, and full reasoning should be read in the published judgment.

The Euribor investigation was one of the largest of its kind in Europe. Regulators in several countries examined how banks contributed to the benchmark, and banks including Deutsche Bank paid substantial penalties. Individual prosecutions were meant to show that responsibility did not stop at the corporate level.

How the rate-rigging convictions unravelled

The turning point came with the Supreme Court's decision on Tom Hayes, the former UBS and Citigroup trader who was the first person convicted in the Libor scandal, and Carlo Palombo, a former Barclays trader convicted in the Euribor case. The court ruled that the trial judges had misdirected juries and that legal errors undermined the fairness of the trials.

That decision opened the door for others. The Court of Appeal subsequently quashed the convictions of five former Barclays traders: Philippe Moryoussef, Jay Merchant, Colin Bermingham, Jonathan Mathew and Alex Pabon. The SFO said at the time that, after considering the judgment, it did not oppose the appeals of five individuals convicted by juries in relation to Libor and Euribor.

Bittar's appeal was the remaining high-profile case. His conviction being overturned on 9 October leaves the criminal outcomes of the UK's benchmark prosecutions substantially reversed, more than a decade after the investigations began.

• 2018: Bittar sentenced to five years and four months after pleading guilty in the Euribor case.
• Supreme Court: found legal errors in the trials of Tom Hayes and Carlo Palombo.
• Court of Appeal: quashed convictions of five former Barclays traders.
• 9 October 2026: Court of Appeal overturns Bittar's conviction.
• SFO response: argued for a different outcome but respects the decision.

A decade of rate-rigging prosecutions has largely been reversed. The scandal changed the market permanently; the convictions did not last.

The legal debate centred on what the offence required prosecutors to prove. Defendants argued that submitting rates with an eye to commercial interests was not dishonest if the rules at the time did not prohibit it, and that juries had been directed in a way that removed that question from them. The Supreme Court's findings on misdirection gave weight to those arguments.

What it means for the SFO

For the Serious Fraud Office, the run of reversals is a significant setback. The benchmark cases were among its most high-profile prosecutions and were presented as proof that individuals, not only institutions, would be held to account for market misconduct.

Williams said the SFO remains committed to tackling complex fraud, bribery and corruption. But the outcomes will fuel debate about how complex financial cases are prosecuted, how juries are directed on market practices, and whether the law was applied correctly to the conduct at issue.

The reversals also raise questions about the guilty pleas entered in such cases. Defendants facing the prospect of long sentences may plead guilty on legal understandings that later prove mistaken. Bittar's case will be studied for what it says about when a guilty plea can be overturned.

The outcomes come at a sensitive time for the agency, which has faced criticism over the handling of several major cases in recent years. Each reversal adds pressure to demonstrate that it can bring complex financial prosecutions that withstand appeal, and will shape how it approaches future market abuse cases.

What it means for markets and benchmarks

The scandal's lasting impact is on market structure rather than criminal records. Regulators responded by overhauling benchmarks. Libor, once the world's most important interest rate benchmark, was phased out and replaced by rates based on actual transactions, such as SOFR in the United States and SONIA in the United Kingdom. Euribor was reformed to rely more on transaction data.

Banks paid billions in fines to regulators in the United States, the United Kingdom and Europe, and introduced controls on how benchmark submissions are made, separating submitters from traders and recording communications. Those changes remain in place regardless of what happens to individual convictions.

For traders and firms today, the lesson is that market conduct rules are permanent even when particular prosecutions fail. Surveillance of communications, controls on information sharing and benchmark governance are now standard expectations across major financial centres, including in Asia.

Asian markets reformed too. Benchmarks such as SIBOR in Singapore and THBFIX in Thailand have been replaced or reformed in favour of transaction-based rates like SORA and THOR, part of the same global shift away from rates that relied on bank submissions. The reforms reduced the opportunity for manipulation regardless of the legal outcomes in London.

The reputational lesson for financial firms

The Bittar ruling illustrates how differently legal and reputational timelines run. The headlines that followed the original investigations and convictions shaped public perception of individuals and banks for years. Quashed convictions rarely receive the same attention, and reputational damage is not reversed by a court ruling.

For firms facing investigations, the lesson is to plan communication for the long term. Regulatory cases, trials and appeals can span a decade, and statements made at each stage will be revisited. Clear, factual communication that avoids prejudging outcomes protects credibility whichever way a case turns.

For individuals, the case shows that the legal process can change direction many years later. Firms that dismissed employees or made public statements based on convictions that were later quashed may face difficult questions, a reminder to focus on conduct and process rather than assumptions about outcomes. Our coverage of how enforcement perimeters are being redrawn shows how regulators continue to adapt their approach.

The quashing of Christian Bittar's conviction closes another chapter in the long legal aftermath of the benchmark rigging scandal. The criminal cases have largely unravelled, but the reforms they triggered, from new benchmarks to strict conduct controls, are permanent. For financial firms and their leaders, the episode is a reminder that legal outcomes can change years later, while reputations and regulatory expectations endure.