Jamie Dimon has bought more than $17m of shares in JPMorgan Chase in an apparent demonstration of confidence as federal authorities investigate a shock trading loss at the bank.

The JPMorgan chief executive and his wife Judy bought 500,000 shares this week, according to a filing with the Securities and Exchange Commission on Friday.

At an average price of $34.27, the purchase is worth about $17.1m, an unusually large buy for Mr Dimon, equivalent to most of his $23m annual pay and bonus. His total direct holdings in JPMorgan are now worth almost $110m and indirect positions are worth millions of dollars more.

While Mr Dimon can buy JPMorgan shares for himself, the company cannot follow suit following trading losses in its chief investment office that were revealed in May.

The Federal Reserve told JPMorgan to suspend its buyback to preserve capital until it can prove it has a grip on the losses, which have reached $5.8bn, the bank said during its earnings presentation a week ago.

The FBI and bank regulators are investigating the incident – believed to have involved losses on a credit derivatives bet by a trader dubbed the “London whale” – and whether its disclosure complied with rules.

JPMorgan’s stock has fallen 20 per cent in the past three months, underperforming other large banks. Only Citigroup has fared worse.

JPMorgan and other banks are also being probed by investigators looking at the attempted manipulation of interbank borrowing markets.

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