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 Art Technology Group (Nasdaq: ARTG) are soaring as much as 48% above last night's closing price today, for a very good reason.

So what: And that reason is a firm buyout bid by software titan Oracle (Nasdaq: ORCL), offering to pay $6 per share. Despite a quick "fiduciary duty" lawsuit claiming that Art Technology isn't getting full value out of the deal, most investors seem perfectly happy as the trading action is mostly hovering just below the offer price.

Now what: The e-commerce software specialist hasn't been this expensive and valuable since the dot-com days, when it briefly commanded a share price of $121. The offer on the table looks generous when you consider that Oracle is paying 57 times trailing earnings and 3.5 times sales. If you're holding out for a better offer or an outright bidding war, you should probably reconsider -- take the profits now and redeploy your capital elsewhere.

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Fool contributor Anders Bylund holds no position in any of the companies discussed here. The Fool owns shares of Oracle. 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 is investors writing for investors.