I'm a novice swing trader using Scottrade, but I'm looking to switch to IB primarily for execution speed (I typically do all my trades as close to end of day as possible) and low commission rates. One of my biggest problems with Scottrade is that I short frequently, and Scottrade is usually hit or miss on whether or not they have sufficient shares in inventory. Most times I actually need to call them to have the short order entered by one of there brokers (very annoying). I went through IB's website to check their short inventory on stocks that I've historically shorted and found a handful of stocks that they don't carry at all (e.g., RINO, AHS), which would have resulted in a costly missed opportunity. Also, the IB website gives no indication of the number of shares available to short for a given stock. Are there any IB users out there who short frequently and can tell me their experience using IB? If you use TWS and the short order is rejected, can you call IB directly to see if they can borrow the shares, or are you just SOL? Thanks for all of your help!!!