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Where does the apostrophe go when using the possessive plural for 'client'. Is it clients' or client's?

Answer:
Client's is the correct spelling for the singular form, e.g. "That is my client's briefcase."

Clients' is the correct punctuation for the plural form, e.g. "Those are my clients' briefcases."

First answer by Val Newton. Last edit by On the Wallaby. Contributor trust: 2763 [recommend contributor recommended]. Question popularity: 5 [recommend question].