Following <a href="http://www.wolframalpha.com/input/?i=Exxon+Mobil+vs+Apple+market+capitalization" rel="nofollow">http://www.wolframalpha.com/input/?i=Exxon+Mobil+vs+Apple+ma...</a> (Exxon Mobil is the largest traded company)<p>Also: <a href="http://www.wolframalpha.com/input/?i=Apple+vs+Microsoft+vs+Google+vs+IBM" rel="nofollow">http://www.wolframalpha.com/input/?i=Apple+vs+Microsoft+vs+G...</a>