There's a ton of information about "short" positions, check out the following website. http://www.shortsqueeze.com/
Not be be confused with FINRA short data:
The FINRA short data comprises unsettled trades. Trades that are not made in-house ( eg TDA buyer from a TDA seller ) take up to 3 market days to locate and deliver the traded shares. Those trades are referred to as short sales until settled...NOT short positions.