Can you recommend a broker with generous margin requirements for ETPs such as the tickers SVIX and SVXY (which often require 100% on long positions due to the risk of sudden and large drops)? I am trading a diversified portfolio which I believe is reasonably well-hedged, and do think some leverage would be beneficial. At Interactive Brokers with portfolio margin, a 100% cash covered position in SVIX is required (although that's occasionally lowered). Are there brokers that will allow leverage on this ticker at 50% or less? I'm not sure how to check the sea of brokers out there.