I'm looking for a file that contains either all the CEOs or preferably the executive boards. Any file format is okay. I just can't find anything or any file that has this data, nor do any of the APIs I've looked through offer this.
For publicly traded companies, Google Finance or another similar site will list the officers and directors. For example, GOOG: https://www.google.com/finance?q=google
For private companies, I have found investing.businessweek.com to be a good source. For example, Socrata: http://investing.businessweek.com/research/stocks/private/snapshot.asp?privcapId=41354884
Either of these could be screen-scraped within reason or maybe they even have APIs.