grammar - Repetition of the indefinite article with several nouns

Now there's another question for the repetition of indefinite article with several adjectives, but my question here is rather about nouns.

Examples:

She's a manager and a shareholder.

or

She's a manager and shareholder.

Do we make use of only one indefinite article or add several?

Answer

For lists of two, either works. When the list gets beyond two, it's appropriate to use the latter in a comma separated list.

She's a manager, shareholder, financier, and senior adviser.