Companies seeing their shares trading at penny stock levels are constantly looking for a breakthrough. Whether it is a new product, management revamp, or financial improvement, any of these can act as a trigger for the company's stock. It appears that Plug Power (PLUG) may have found it in the form of a bullish note from leading broker Craig-Hallum. The Minnesota-based broker has lifted its price target on PLUG stock to $4 from $2 while maintaining a “Buy” recommendation. Amid record production levels, an ...