The standard logo appears on your company's main LinkedIn page. For optimal rendering quality, it must be in GIF or PNG format and measure exactly 100 pixels wide by 60 pixels tall.

Learn how to build out and optimize your LinkedIn company profile for maximum visibility. ... For profile details, be sure to choose a logo that is consistent with the brand, ...

You can change the admins on a LinkedIn company page in a few simple steps. Admins manage every aspect of a company page including the company title, description, logo, website and Twitter feed.