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There are two accepted forms for possessive singular nouns ending in s:

Add an apostrophe (') after the existing s at the end of the word:

  • Pony Express'

Add an apostrophe s ('s) after the existing s at the end of the word:

  • Pony Express's

Examples:

The Pony Express' reputation grew quickly.

The Pony Express's reputation grew quickly.

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9y ago

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