The general rule for the possesive of nouns covers most proper nouns, including most names ending in sibilants (but see exceptions in 6.26-27 and alternatives in 6.30)The manual provides "Marx's" as the one example most analogous to "Netflix's", which would not qualify as an exception as described above. So it looks like "Netflix's" is the way to go, at least according to this style guide.
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"However, many non-English words that end with a silent "s" or "x" will form their possessives with only an apostrophe."
But it's more complicated than that.
posted by disillusioned at 10:45 PM on July 13