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 Timken (NYSE:TKR) jumped 11% at 1:30 p.m. ET after news that an activist investor took a stake reached the market.

So what: Relational Investors, an activist fund, has bought a 6% stake in the manufacturer and reportedly plans to argue for a breakup. The Wall Street Journal reports that the fund has already met with executives and board members about its plan to break up the company.

Now what: We still don't have official word about Relational Investors' stake or its plans, so investors are currently speculating. The company also has a well-entrenched management that will probably fight any changes. I don't see this as a buying sign since everything is speculation at this point, but it may urge management to find ways to unlock value at the company.

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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.