Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of residential solar power Vivint Solar Inc. (NYSE:VSLR) jumped as much as 14% late in trading today after an analyst upgrade.

So what: Analyst P. Jobin at Credit Suisse reiterated an outperform rating on the stock and raised his price target to $22 per share. It wasn't until the call was featured on CNBC that the stock started to move today. It may sound ridiculous, but CNBC is a common channel to have on in trading floors, and the mere mention of Vivint Solar's upgrade seems to have given the stock a boost today.

Now what: I've been saying for some time that Vivint Solar is undervalued compared with SolarCity (NASDAQ:SCTY.DL), so I'm not surprised to see it having a good year. But the company's valuation has increased to a value similar to that of SolarCity's, in relation to their annual installations.

While I like Vivint Solar's business and its relatively small market cap, I don't think an analyst's changing a price target and a mention on CNBC is a reason to jump into the stock. If shares sink in the coming weeks, it could be a nice entry point, but for now I'll sit out this pop and wait for a better buying opportunity.

Travis Hoium has no position in any stocks mentioned. The Motley Fool recommends SolarCity. The Motley Fool owns shares of SolarCity. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.