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 teen apparel retailer American Eagle (NYSE: AEO) popped 10% today after Chairman Jay Schottenstein disclosed a $1 million purchase.

So what: As legendary fund manager Peter Lynch once said, "Insiders might sell their shares for any number of reasons, but they buy them for only one: They think the price will rise." Given the relatively large size of the buy, coupled with Schottenstein's track record of timely purchases, investors are naturally interpreting the news as an extra-strong buy signal.

Now what: Don't let today's pop keep you from looking into the stock. American Eagle is still down about 20% over the past six months, boasts a juicy 4% dividend yield, and continues to trade at a clear P/E discount to main rival Abercrombie & Fitch (NYSE: ANF). Fools know never to follow insiders blindly into a stock, but Schottenstein's big buy is nice confirmation that the shares are at least a decent value.

Interested in more info on American Eagle? Add it to your watchlist.

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.