Most things you write become "yours" simply by virtue of having created it. Obviously, unless you sign away the copyright to a piece of writing, it belongs to you.
Wikipedia guidelines advise that nobody "owns" or controls any particular content, including a full entry. Even if the article is about you, it's not "yours" and you cannot control what it says. The best you can do is join the fray.
This is one reason why companies are advised to think twice before seeking a Wikipedia profile. Its content is not dictated by anyone, but decided by those who know the rules. And it's a safe bet Wikipedians know them best.