Organovo Holdings (NASDAQ:ONVO) rode the wave of 3-D printing hoopla to a listing on the New York Stock Exchange.  During 2013, the 3-D bioprinting company saw its shares more than quadruple. This year, however, has not been so kind -- with shares having lost about one-third of their value.

Being an investor -- as opposed to a trader -- means taking the long view when it comes to buying and selling stocks. That doesn't mean months or even a year, but at least three years. That's usually the bare minimum required to see whether or not your investment thesis plays out.

That being said, it's worth checking in with your holdings on a semiregular basis. With 2014 almost half way done, now seems like the perfect time to cover your bases. In the slideshow below, you'll see how Organovo got to where it has this year, and what you need to keep your eyes on for the rest of 2014.