This is true. You can verify this yourself by owning a high growth, non-shortable, thinly traded stock (less than 200,000 shares traded a day). On a bad news r

This is true. You can verify this yourself by owning a high growth, non-shortable, thinly traded stock (less than 200,000 shares traded a day). On a bad news release (such as earning) or just a bad sell off day such as Wednesday, you will how bad the slippage is on your protected stopped. For example, you own XYZ and it was at $25 at the close on Friday. There was a bad release over the weekend and the price is going to be opened at $21 on Monday morning. You have your protected stop at $20. You would think you would get out at $20 give or take 10 cents for slippage. But when your received your filled report, you see it was filled at $17. What happened is there is 0 buyer and everyone just want to get out. If there were short shorters, they would come in at market open to book some profits by buying back the share they have shorted.