Nvidia currently has 67% of thier shares outstanding, almost entirely tied up by institutional investors.
As folks start closing out 401k's and mutuals because of the beating they have been taking and rolling it into "safer" alternatives, NVDA's share price has declined accordingly. NVDA is being hurt by the lack of investor faith in general, and not flaws with the operation of the company itself.
http://www.nasdaq.com/asp/Holdings.asp?symbol=NVDA`&symbol=&selected=NVDA`
Using Market Cap to determine how "big" a company is probably the least informed, useless metric available. There are many more effective metrics that give you a better idea, like number of employees (my personal metric), revenue, net, assets, etc.
Calling NVDA overvalued at any time this year is pretty ludicrous, but calling NVDA overvalued compared to direct competitors or even the semi-con market just shows you've done no research, and really shouldnt have commented in the first place.
As of the last time I checked, NVDA's P/E Ratio was 6.6(!!). Vs. other semicon companies, this makes it extremely undervalued, even with the revenue decrease written in. While most semi-con companies are struggling to turn a profit, NVDA is doing so very aggressively.
http://screening.nasdaq.com/screening/quotes_competitor.asp?symbol=NVDA`&selected=NVDA
Currently Nvidia's PEG Ratio is 0.47. Thats undervalued in any market.
Comparing ATI vs. NVDA's fundamental's directly is a great example of a company you should invest in and a company you shouldnt invest in.
While NVDA's is a picture of a company with increasing revenue, and net, even while nearly doubling its R&D expenditures:
http://www.nasdaq.com/asp/extendfund.asp?kind=extendfund&symbol=NVDA&selected=NVDA
ATI is a horror show of losses inspite of itself:
http://www.nasdaq.com/asp/extendfund.asp?kind=extendfund&symbol=ATYT&selected=ATYT
That pretty much says it all.
A "Poison Pill" does not prevent a takeover. The usual method of taking a "Poison Pill" is to saddle the company up with debt beyond its market cap in an attempt to make a hostile takeover very unattractive, as the receiving company will be responsible for the debt, effectively more than doubling the purchase price of the company. The obvious downside is if the takeover is backed off, the company still has the debt and it could end up killing the company in the process, so its used more for sabre rattling than actual practice.
NVDA Insiders currently control 33% of shares, and are very close with several of thier institutional investors. Many of them believe that NVDA's potential in the next 5 years will be pretty spectactular, and the hype of "The Next Intel" is still looming out there. Any company attempting to take over NVDA hostily would at best do so by a few slim margin after a very tough fight, much tougher than the HP/Compaq merger votes. IMO, I dont think its worth it to any of the players at this time to do so. Microsoft, the only company with the obvious resources and willingness, is frankly covertly putting thier weight behind NVDA. They'd like to see NVDA become a major hardware power and displace Intel a bit, as a fractured hardware market serves them best as the standards makers. Acquiring NVDA would not only make every graphics vendor in the world scream bloody murder, it would also raise the distinct ire of INTC, who sees NVDA as one of thier top three threats in the market.