corporate, sleek and very professional logo design

we are after a professional, sleek, corporate logo that gives the impression that the company is trustworthy, established and a market leader. Logos that give the correct impression are those such as amazon, coca cola, sony, mitsubishi etc. We will require examples of previous work - this logo is for the purpose of Corporate Branding and needs o be strong and VERY VERY sleek and professional. Please pmb us for more info Thanks