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 Medicaid-related health-care plan provider Molina Healthcare (NYSE: MOH) popped by as much as 31% this morning after it announced that it would continue to be a Medicaid managed health-care provider in Ohio after winning a bid from state officials.

So what: Before you get too excited, understand that today's 31% rise follows yesterday's 31% tumble after Molina warned that higher costs in Texas would cause it to potentially lose money in the state, and forced it to rescind its earnings guidance. Today's news out of Ohio adds some wind back into shareholders' sails as Ohio chose to reverse its original decision and give its Medicaid managed health-care business to both Molina and Centene (NYSE: CNC) at the expense of Aetna (NYSE: AET), which is a large commercial insurer in the state. The state's decision remains unchanged on UnitedHealth Group (NYSE: UNH) and it will join Molina and Centene as a health-care plan provider.

Now what: Today's news is good because it will drive new business, but it could prove to be a moot point if Molina is paying out more in medical costs than it's bringing in with its premiums. Molina is a cash-rich company that has historically traded at a lower valuation than its peers mainly because of its targeting of lower-income (and thus, lower-margin) families, so it does have an attractive valuation on its side. However, until Molina solidifies its near-term picture and guidance, I wouldn't be brave enough to go near the stock.

Craving more input? Start by adding Molina Healthcare to your free and personalized watchlist so you can keep up on the latest news with the company.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.