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 AerCap Holdings (NYSE: AER) jumped as much as 16% today after rumors emerged that the company may be up for sale.

So what: reported via Twitter that AerCap is looking into strategic options and had hired Goldman Sachs to advise the company. Wells Fargo analyst Gary Liebowitz thinks the company could go for $17 per share in a sale, more than $4 from the current share price.

Now what: Betting on buyouts is risky business, so I wouldn't be buying on this news alone. With that said, shares aren't a bad value at 11 times trailing earnings and less than six times forward earnings estimates. If shares fall from today's high, the stock would be a good buy, but I'd like to let the rumors die down first.

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