Shorts don’t ever expire. Call and put options expire. Almost always on fridays. Short float stats are assembled by data aggregators who work with the exchange

Shorts don’t ever expire. Call and put options expire. Almost always on fridays. Short float stats are assembled by data aggregators who work with the exchanges and brokers. Its not directly available for free but instead with subscription services like Bloomberg or others. Many websites post the information publicly but it is ofter delayed and stripped of much additional information.