MBBA
iShares Mortgage-Backed Securities Active ETF
stock BATS ETF

1) Data from Interactive Brokers. IBKR publishes an updated file every 15 minutes. If there's no update, there aren't any shares available.

2) A stock loan fee (a.k.a. borrow fee, borrow rate, or cost to borrow) is a fee charged by a brokerage firm to a client for borrowing shares. Investopedia

3) A stock loan rebate is a cash payment granted by a brokerage to a customer who lends stock as cash collateral to short sellers who need to borrow stock. A positive rebate fee means the lender pays the interest to the broker-dealer. A negative rebate fee means the security is hard-to-borrow and the broker-dealer pays the interest to the lender. Investopedia   SEC.gov

1) Data from Interactive Brokers. IBKR publishes an updated file every 15 minutes. If there's no update, there aren't any shares available.

2) A stock loan fee (a.k.a. borrow fee, borrow rate, or cost to borrow) is a fee charged by a brokerage firm to a client for borrowing shares. Investopedia

3) A stock loan rebate is a cash payment granted by a brokerage to a customer who lends stock as cash collateral to short sellers who need to borrow stock. A positive rebate fee means the lender pays the interest to the broker-dealer. A negative rebate fee means the security is hard-to-borrow and the broker-dealer pays the interest to the lender. Investopedia   SEC.gov