Learn English – “When all you hear is fear and lies”

american-english

These company names are collective nouns. In general, in American English collective nouns almost always trigger singular verb agreement (after all, "Microsoft" is grammatically a singular noun, even if semantically it denotes an entity made up of many people). It is apparently much more common to use plural verb agreement in British English. It doesn't have anything to do with the size of the company.

Lots of good information here: Language Log on collective nouns, etc.

There're is common in speech, at least in certain dialects, but you'll rarely see it written. If I were being pedantic, I'd advise you to use there are in your example, because there is is definitely wrong, so there's could be considered wrong as well. But a huge number of English speakers, even those that are well-educated, use there's universally, regardless of the number of the noun in question, so you will probably not receive any odd looks for saying or writing there's, and if you do, just cite the fact that it can't be incorrect if a majority of people use it. As for me (a native New Englander), I use both, but may use there's in place of there're if I'm speaking quickly.