THOUSAND OAKS, Calif. (AP) — THOUSAND OAKS, Calif. (AP) — Atara Biotherapeutics Inc. (ATRA) on Monday reported a loss of $19 million in its second quarter.

The Thousand Oaks, California-based company said it had a loss of $3.10 per share.

The results missed Wall Street expectations. The average estimate of three analysts surveyed by Zacks Investment Research was for a loss of $1.25 per share.

The drug developer posted revenue of $28.6 million in the period.

Atara Biotherapeutics shares have declined 39% since the beginning of the year. In the final minutes of trading on Monday, shares hit $7.77, a decline of 86% 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 ATRA at https://www.zacks.com/ap/ATRA