I don't believe the shares are actually owned by HSBC, JPM or Citibank - they are custodians.
I know my shares are held via Citibank.
A small percentage of SLR is shorted - it may even include my shares. This does not worry me as I am an investor, not a trader. If shorting lowers the share price below what you think it is actually worth surely this is an opportunity for you to buy cheap shares?
SLR Price at posting:
$1.37 Sentiment: Hold Disclosure: Held