holy guacamole, it's up like 10bn market cap on the split (1800 pre-split price). i covered my short on wednesday mostly because i thought it settled T+3 and i figured the split might be a problem. plus the borrow cost is annoying at like 1.3% cost /day its time to reload at some point assuming i can get the borrow again.
Use search function to find RGC stuff. @Maverick2608 has asked this question before Interactive Brokers does not allow shorting RGC