Barrett Business Services, Inc. (Nasdaq:BBSI) shares are plunging more than 17% after the human resource management company posted first-quarter revenue of $259.6 million, up 1% from $257.5 million. Wall Street analysts expected $276.4 million in revenue.

In Thursday afternoon trading, BBSI shares are plummeting 17.01%, or $2.59, at $12.64. For detailed price information and recent news stories about Barrett Business Services, click BBSI.