Party City Holdco Inc (NYSE:PRTY) shares increased 23.62% in pre-market trading to $26.90 as the party supply store is set to release earnings today after market close. The company went public in mid-March with an IPO price of $17.

Cyren Ltd (NASDAQ:CYRN) shares increased nearly 16% to $3.50 after the cloud-based security solution company announced an agreement with Dell that adds Cyren’s virus protection software to Dell services. International, Ltd. (ADR)(NASDAQ:CTRP) are up more than 13% to $74.10 in pre-market trading after the company reported better than expected 1Q15 earnings. China’s largest online travel agency reported a 46% year-over-year increase in revenue and a much narrower diluted loss per share than anticipated.

Shake Shack Inc (NYSE:SHAK) shares are up more than 9.39% to $74.78 after the fast-casual burger joint reported earnings. Shake Shack saw a 56% increase in sales and nearly a 12% increase in same-store sales. The burger chain went public in late January and has plans to continue opening new locations in Tokyo and Los Angeles.