BOSTON (AP) _ Zafgen Inc. (ZFGN) on Tuesday reported a loss of $15.8 million in its second quarter.

On a per-share basis, the Boston-based company said it had a loss of 57 cents.

The results topped Wall Street expectations. The average estimate of three analysts surveyed by Zacks Investment Research was for a loss of 60 cents per share.

Zafgen shares have more than doubled since the beginning of the year. In the final minutes of trading on Tuesday, shares hit $9.41, more than doubling in the last 12 months.

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This story was generated by Automated Insights (http://automatedinsights.com/ap) using data from Zacks Investment Research. Access a Zacks stock report on ZFGN at https://www.zacks.com/ap/ZFGN