Shares of Interactive Brokers Group (IBKR - Get Report) advanced 1.4% to $56.08 Wednesday as increased revenue helped the electronic broker beat Wall Street's first-quarter earnings estimates. 

The company reported earnings of $48 million, or 64 cents per share, compared with $47 million, or 65 cents, a year earlier. Analysts were looking for earnings of 43 cents a share.

Revenue totaled $558 million, up 5.9% from a year ago, and beat Wall Street's forecast of $464 million.

The results for the quarter were driven by strong growth in net interest income, the company said in a statement, which increased $29 million, or 13%, from a year ago. 

This was offset by lower commissions revenue, which decreased $47 million, or 21%, on lower customer trading volume; and a $57 million reversal on the company's currency diversification strategy, which swung from a $38 million gain in the year-ago quarter to a $19 million loss this quarter.

"Our business is strong even with moderate volatility, but because of the highly automated nature of our platform and our low-cost structure, more trading activities sends a higher proportion of revenues to our bottom line,"  Nancy Stuebe, director of investor relations, said during a conference call with analysts, according to a transcript of the event.

Total DARTs (Daily Average Revenue Trade) decreased 10% from the year-ago quarter to 848,000. Customer equity grew 14% from the year-ago quarter to $147.6 billion and customer debits decreased 13% to $25.5 billion.