A look at the 10 biggest percentage decliners on New York Stock Exchange at the close of trading:

Vocera Communications Inc. fell 27.2 percent to $9.15.

Bill Barrett Corp. fell 12.3 percent to $21.06.

Boyd Gaming Corp. fell 11.4 percent to $9.75.

OM Group fell 11.0 percent to $25.17.

HFF Inc. fell 10.2 percent to $30.50.

Circor International Inc. fell 9.5 percent to $65.06.

Midstates Petroleum Co. fell 9.4 percent to $5.78.

MaxLinear Inc. fell 9.3 percent to $8.60.

Halcon Resources Corp. fell 8.9 percent to $5.42.

Castlight Health Inc. fell 8.8 percent to $12.23.