The short list is extensive and derived from multiple providers of easy-to-borrow lists, including Vision and Convergex. 

Non-easy-to-borrow shares can also be located for a fee.

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The short list is imported daily into the trading platform. 

If the stock permissioned to be shorted the platform will show a green S next to the symbol box.

TradeZero provides you with an estimated overnight borrow calculator to help you understand and manage the costs of holding a short position overnight. Any displayed intraday overnight borrow rates are estimated and are subject to change throughout the trading day.

TradeZero's actual overnight borrow rates are established after the close of regular trading hours (4:00 pm Eastern Time) every trading day and may vary substantially from any estimated rate received prior to the 4:00 pm ET close.

Furthermore, actual overnight borrow rates may also vary substantially from day to day. By holding a short position overnight for one or more nights, you understand and agree that TradeZero will charge you the actual overnight borrow rate applicable for each night you hold a short position until you cover that short position. As a result, it is important to check the estimated cost daily if you plan on holding a short position for more than one day. You are ultimately responsible for all risks and costs associated with your trading.

On rare occasions, a clearing firm may have difficulty maintaining a borrowed stock. 

In this scenario the broker will try to obtain a new locate before the open to maintain the position. If the broker is unsuccessful, the clearing firm transacts a buy-in to cover the stock held short.

This is an industry wide practice in which none of the parties concerned have any control over. In this regard, TradeZero accepts no liability for such occurrences. 

https://www.investopedia.com/terms/b/buyin.asp

When a stock is halted, it means trading is suspended by the regulatory bodies overseeing the exchanges and marketplaces.

This may occur for a variety of reasons including, pending news, regulatory investigation, corporate restructure, or activation of the Limit Up Limit Down rule.

If a stock is halted only for a brief period during the day, your open short position can be covered when trading resumes.

However, if a stock is halted for an extended period of time and you cannot cover the open short position before the close of after-hours trading at 8:00 PM ET, you will be responsible to pay any overnight borrow costs, margin costs and any other fees incurred daily until the stock begins trading and the position can be covered or until DTC delists the security.

TradeZero will need to have sufficient equity in the account to cover these charges.

Yes you will. The position is still open therefore locates will have to be secured so the position can remain open, even if market is closed or the stock isn't actively trading.

A locate for a security may be re-applied for an intra-day buy-to-cover trade in the following scenario:

Prior to a customer’s short sale of 100 shares of XYZ stock, the executing broker-dealer obtains an appropriate locate for the securities. The short sale is then executed. Subsequently that day, the broker-dealer purchases 100 shares of XYZ stock for the customer, and the customer’s net trading position is flat. If the customer wants to then sell short another 100 shares of XYZ stock in the same trading day, the executing broker-dealer may apply the original locate to that sale, provided that such subsequent short sale is for an amount of securities that is no greater than the amount of securities obtained in the original locate, and provided further that the source of the located shares indicates that the original locate is good for the entire trading day.

For a "non-easy to borrow" security or a threshold security, a broker-dealer may not re-apply a locate for intra-day buy-to cover trades. Without obtaining locates prior to each short sale in such securities in the scenario described above, it is unlikely that the broker-dealer executing such trades would have reasonable grounds to believe that such securities can be borrowed so that they can be delivered on the date that delivery is due on each trade.

A broker-dealer, however, may have reasonable grounds to believe that securities will be available when delivery is due on such short sales if the broker-dealer pre-borrows the securities.

Short locate fees are fees paid in order to enable the permission to short stocks that are non-easy-to-borrow and existing at that moment in time.

The rate is determined by the availability of shares for shorting at that moment in time.

The fees can vary during the day depending on market conditions. Locate fees are charged only after the price for the locate is accepted.

If the locate shares are declined, then no fee is charged.

Cash accounts and margin accounts with an account balance of less $500 cannot short sell stocks.

Margin restricted symbols cannot be shorted with leverage. Refer to the margin restricted stocks list in the client portal.

Short Selling