Canopy Growth Corp (WEED)

[Carpathian]

The simple way to think about it is - shorts need to borrow shares to cover their positions. A broker needs those shares which is why a stock can be "hard to borrow" which means the broker does not have enough shares to cover a short position taken.
Hence why Fidelity looks for people to borrow those shares. In my case Wells Fargo is that "person". Wells fargo is currently borrowing all my shares and I get paid as long as they have them.