Get permission, or get it worked into the contract with them. Stay safe: Large corporations, such as Fortune 500 companies, often have subsidiaries, branches,

Get permission, or get it worked into the contract with them. Stay safe: Large corporations, such as Fortune 500 companies, often have subsidiaries, branches, or otherwise incorporated offices all over the world, and also in their home country. Ensure that the legal entity you work with has sufficient wording in the contract that you can claim to work with the parent entity too (the Fortune 500 recognised name). But in the end, surely it is about your relationship with someone you're claiming a client (and I'm assuming this is the case, having their logo on your website, and that you're including the logo to convert other largish clients). If basic due diligence if performed by a prospective client and you don't receive a favourable reference (or worse, a denial of relationship), it will kill a conversion either at the outset of later (and later could be worse - legal charges of misrepresentation or worse). Stick with names that you have an auditable relationship with, that include positive anecdotes, and can be relied upon to confirm a working relationship.