Edge Online has documented its top 20 publishers of 2008, based on various criteria including revenues, profits, growth and publishing success in the industry's definitive annual game publisher rankings.
This feature lists each publisher in the top 20 and has aligned all companies' fiscal years to 4/1/2007 to 3/31/2008 for the sake of comparison. You can view exact criteria here.
Here you'll learn each publisher's strengths, weaknesses, potential for greatness and potential for failure in careful detail. To set the tone, here are a few overall graphs.

Next, here is a graph of the net profit/loss (or operating profit/loss) for each of those same 20 companies.

To get to any of the publishers right away, you can use the index below:
20. Midway
19. D3 Publisher
18. Codemasters
17. SCi/Eidos
16. Infogrames (Atari)
15. Disney
14. Square-Enix
13. Capcom
12. THQ
11. Take-Two Interactive
10. Sega Sammy
9. Namco Bandai
8. Sony
7. Vivendi
6. Ubisoft
5. Konami
4. Microsoft
3. Electronic Arts
2. Activision
1. Nintendo
NEXT: THE RANKINGS
We should mention the absence of a notable publisher, namely LucasArts. In the work above, we have included only publicly traded companies. While LucasArts is clearly a big player, they are a private company. Therefore, their data is not public and we have declined to speculate on their finances.