Afternoon Market Gainers

Towerstream TWER gained 15.65% to $2.57. Towerstream's trailing-twelve-month revenue is $32.76 million.

Ceres CERE soared 26.04% to $3.34. Ceres shares have dropped 68.90% over the past 52 weeks, while the S&P 500 index has gained 20.38% in the same period.

GT Advanced Technologies GTAT jumped 14.68% to $4.14 after Canaccord Genuity upgraded the stock to Buy and raised the price target from $4.00 to $5.00.

Spar Group SGRP skyrocketed 34.37% to $3.05 making most of its gain on Thursday and is currently bouncing off the $3.00 support level.

Hanwha SolarOne HSOL traded up 9.57% to $2.05 after the company obtained its three-year $100 million term-loan facility.

Empire Resorts NYNY popped 8.67% to $3.02 after the company announced the conclusion of its rights offering (the “Rights Offering”) and standby purchase of shares not sold in the Rights Offering, in which upon completion it will issue a total of 6,032,153 shares of common stock at $1.8901 per share and raise approximately $11.4 million in gross proceeds.

MeetMe MEET gained 9.99% to $1.68, making a rally after a down day on Wednesday.

Intevac IVAC raised 10.10% to $5.56 after the company announced that it has successfully qualified the ENERGi ion implant production system that was ordered and shipped in the first quarter of 2013 to a Tier 1 solar company in Asia.

Christopher & Banks CBK got a boost, gaining 9.14% to $6.45 on upbeat Q2 earnings.