Benzinga's Top #PreMarket Gainers

AcelRx Pharmaceuticals Inc ACRX shares gained 28.90 percent to $3.88 in the pre-market trading session after the company reported that it has been awarded a contract worth up to $17.0 million from the Department of Defense to advance ARX-04. Perry Ellis International, Inc. PERY shares rose 16.35 percent to $27.96 in pre-market trading after the company reported stronger-than-expected results for the first quarter and lifted its earnings forecast for the full year. Ctrip.com International, Ltd. (ADR) CTRP shares surged 13.59 percent to $74.24 in pre-market trading after the company reported upbeat Q1 results. Shake Shack Inc SHAK shares climbed 8.27 percent to $74.01 in pre-market trading after the company reported stronger-than-expected results for the first quarter. Longbow Research upgraded Shake Shack from Underperform to Neutral. Bojangles Inc BOJA gained 3.98 percent to $27.45 in pre-market trading after rising 3.81 percent on Wednesday.