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 Protective Life Corp. (NYSE:PL) are trading 11% higher today following news that Japan's Dai-ichi Life Insurance is planning to spend approximately $5 billion to buy an American insurer. Protective Life is the only insurer named in most reports, but its current market cap ($4.6 billion) remains a bit below the rumored buyout price.

So what: The news of Dai-ichi's intentions broke first in Japan's Nikkei financial newspaper, which lends its name to the popular Japanese market index. Early reports stated that Dai-ichi was prepared to spend up to 500 billion yen, which translates to roughly $4.9 billion. Dai-ichi has since responded with a public statement confirming its interest in an American acquisition, but denying any specific interest in Protective Life. Protective Life, for its part, has stated that it is company policy not to comment on speculative media reports.

Now what: If Protective Life does sell to Dai-ichi, it could still pull in a further 7% premium, which is not worth the risk for investors who might jump in after today's 11% pop. However, Protective Life is worth keeping an eye on if the deal doesn't materialize, as it's been a four-bagger over the past five years, with EPS growth of over 200% and a dividend that's doubled since late 2009. Shares will drop if the deal falls through, and that might present a good buy-in opportunity for eagle-eyed investors.

Top dividend stocks for the next decade
The smartest investors know that dividend stocks simply crush their non-dividend paying counterparts over the long term. That's beyond dispute. They also know that a well-constructed dividend portfolio creates wealth steadily, while still allowing you to sleep like a baby. Knowing how valuable such a portfolio might be, our top analysts put together a report on a group of high-yielding stocks that should be in any income investor's portfolio. To see our free report on these stocks, just click here now.

Alex Planes has no position in any stocks mentioned. The Motley Fool has no position in any of the stocks mentioned. 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.