I'm one of those guys who shorts UVXY (please no critiques in this thread). I used IB for this trade until I got tired of them not having any shares on hand or even calling my shares back. Then I tried Schwab and I was pleasantly surprised how I was rarely turned down when I wanted to short some UVXY, and never had any called away. But lately, Schwab has been getting problematic, like all week I couldn't get any UVXY to short. I'm not sure if this issue is linked to the overall level of short interest in the underlying or not, or if it's broker related, but if it the later, is there a really good broker for shorting this product?