I've heard of the bear selling TSLA short but I've just kind of doing the opposite of short selling. I'm a totally novice, never traded a single stock in my life but TSLA has been dipping so low that some expert said it's a good buy. So I opened an account with Ameritrade just a few days ago, bought all the TSLA I could buy (at 205.868/share) with half of my saving. Today, I look around in my Ameritrade account and found that it says I have some dollar amount available for trading (equivalent to a little over a half of the stock I own.) So use that amount to buy TSLA at 225/share. My balance went negative by about the same amount. Then I remember someone has advised that we should prevent the shortsellers from getting their hand on our Tesla shares. So I placed an order to sell all my TSLA (including the 50% I bought on margin) at $5000 with All-Or-None condition on the order. So not only I prevent the shortsellers from selling the shares I actually own free and clear, I also protect 50% more shares from the short. I am right? Is the advice valid? I wondered if the standing sell order actually set the shares aside and remain untouched.