Quick Stock Market Help

[bighomage]

I know this belongs in the stock market forum, but I want to make an immediate decision and there's nobody in there:

I'm very new to the stock market. I own about 50 shares of Aladdin Knowledge (NASDAQ: ALDN) and it has been doing pretty well. Today, the CFO announced that he is stepping down in September and immediately the stock began to go down. Is this something I should be worried about and sell the stock while I still have a profit on it, or should I just hold onto and accept that it will just probably go down today because of the news?