The company might just be the right kind of business operating at the right time in history. Veteran medical device maker Penumbra (PEN 4.55%) got a shot of good news on Wednesday. An analyst initiated coverage of the company's stock with a rather bullish review, and investors took this to heart. Collectively, they pushed Penumbra's share price up by almost 5% on a day when the S&P 500 index performed sluggishly with a 0.3% decline. Initiated with a buy recommendation Just after market close on Tuesday, Sti ...