I have permanent access to the database of one of the leading research companies based in the United States. They specialize in gathering names and contact details of executive management and/or decision makers specially in the Information Technology department/division.
Found in their database are more than 350,000 names of senior executives, decision makers, their accurate and verified contact details (direct phone numbers and email addresses, and profiles) from companies from all over the world. The data is also being updated monthly so definitely you will be able to get the most precise and updated information as long as you have the access to their database which I can give you for a very reasonable amount/price.