Some company names which have a possessive form use an apostrophe before the S and some don’t: “McDonald’s” does and “Starbucks” doesn’t. “Macy’s” idiosyncratically uses a star for its apostrophe. Logo designers often feel omitting the apostrophe leads to a cleaner look, and there’s nothing you can do about it except to remember which is standard for a particular company. But people sometimes informally add an S to company names with which they are on familiar terms: “I work down at the Safeway’s now” (though in writing, the apostrophe is likely to be omitted). This is not standard usage.

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