Interactive Brokers Group Inc. (IBKR) is unlikely to recoup trading losses suffered by its clients in the wake of the Swiss National Bank's surprise decision last week to remove a cap on the value of the franc, the brokerage's chief executive said Tuesday.

The broker, which conducts trades for retail investors and others, saw losses of about $120 million on Thursday after the franc shot up against the euro, dollar and other major currencies. The move went against wagers that the franc would fall, resulting in steep losses, particularly for investors who had leveraged their bets.

The broker is unlikely to recover those losses, Chief Executive Thomas Peterffy said in a conference call with analysts following the company's earnings release. The largest losses come from customers living in five areas outside the U.S., including Spain and Hong Kong. The laws of the countries and the degree of solvency of the investors involved could make repayment impossible, Mr. Peterffy said.

Most of the losses came in the currency futures market, Mr. Peterffy said.

Interactive Brokers expects to increase margin requirements, the amount of collateral investors must provide up front as a percentage of any trade, Mr. Peterffy said.

The company's shares were down 1.85% to $27.60 in after-hours trading. The stock closed up 0.1% at $28.12 before the earnings release.

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