Midday Gainers From Tuesday, September 2

XRS XRSC +82% - Shares are up significantly following a bid from Omnitracs to buy the company for $5.60 per share.

Digital Ally DGLY +60% - Shares are seeing a strong rise in share price following the company’s release of full year sales forecast of $22.5 million, which represents a 26.4 percent increase in revenue from $17.8 million in 2013.

Compuware CPWR +13% - The company will be bought out by Thoma Bravo LLC for $2.5 billion.

Norwegian Cruise Line NCLH +11% - The company announced plans to acquire Prestige Cruises International for $3.025 billion.

Staples SPLS +8.2% - Analysts at Credit Suisse upgraded shares on possible merger with Office Depot.

Tesla Motors TSLA +4.5% - Analysts at Stifel upgraded shares to a Buy rating and $400 price target.