Damn , unbelievable that not many mentioned SUN Microsystems - the company that created/developed Solaris, SPARC, Java, NFS, fantastic workstations like SUN Ultra, blade servers, MySQL and the list goes on.
Anyway, Big-N of the 90's and by that I mean where some of the most talented engineers worked.
For those interested there's this amazing documentary from the 90's called Code Rush, it shows Netscape and MS locking horns in the browser wars and Netscape engineers working on probably the first version of Firefox. Some rockstar programmers in it include Jamie Zawinski(a.k.a jwz), Jim Roskind(designer of QUIC), Brendan Eich(creator of JS), Michael Toye, Scott Collins. Also features a young Kara Swisher( for those that do not know , she is among the most prominent tech journalists).
Sun, HP, Microsoft, Oracle, Apple, Salesforce, Ebay, Amazon, EMC. IBM began it's fall into extinction around ~2003, so we won't count them for this exercise, having quietly fired 250,000 out of 600,000 employees since. Google and Yahoo were on the rocket starting around then, and of course each have had their ups/downs.
Since Microsoft has busted out of it's Windows jail and now openly supports Unix, Cloud, IP and most modern architectures. So if there's an award to be given here it'd have to be them. IMHO