This Friday’s top gainers at midday are International Tower Hill Mines Ltd (NYSEMKT:THM), Potbelly Corp (NASDAQ:PBPB) and Mercury Systems Inc (NASDAQ:MRCY). The losers are Dex Media Inc (NASDAQ:DXM), Veeva Systems Inc (NYSE:VEEV) and Demandware Inc (NYSE:DWRE).

chart_1 (2) Dex Media

International Tower Hill Mines Continues 2014 Ride

Surging +5.55%, our top gainer midday today is mining company International Tower Hill Mines Ltd (NYSEMKT:THM). The John Paulson pick has had a stellar 2014 and is up +110.22% YTD.

Second is Potbelly Corp., the price of which increased +5.49% after William Blair upgraded its shares to  an “outperform” rating. The company is in Tiger Global’s portfolio.

Rounding out today’s list of gainers is Mercury Systems, up +3.63%. The company designs and manufactures digital signal products and software, and it was announced today that it is in talks with The Boeing Company (NYSE:BA) for a possible acquisition. George Soros has a position in MRCY.

Dex Media Falters

The biggest loser midday this this Friday is Dex Media Inc (NASDAQ:DXM). The John Paulson pick dipped -9.37%, but investors likely aren’t too worried as the social media and marketing company is up +30.10% YTD.

Second is Veeva Systems Inc (NYSE:VEEV), down -9.02%. It was recently upgraded to “overweight” from “equalweight” at Morgan Stanley and is a Tiger Global allocation.

Third is Demandware Inc (NYSE:DWRE), which slipped -8.95%. Demandware provides software-as-a-service e-commerce solutions and is also a Tiger Global pick. It continues to suffer from last month’s results report, and its stock price has fallen -11.95% this year.