Account used is from Interactive Broker.

Shorted 5,000 shares of BAC at $9.02 (SELL) i.e. about $45,100.
Maintenance Margin shown is about $25,000.
So margin is about
55.4% (i.e. 25,000 / 45,100), seems quite high.

Put in place
Stop Loss order at $9.20 and
Take Profit Limit order at $8.80 (target profit is $1,000).
Within a short few minutes, the position was positive in the money. Manually adjust Stop Loss order tighter from $9.20 to $8.89 to protect profit.

Wanted to sleep soon. so continue to manually tigthen Stop Loss gradually and it got triggered and closed out at $8.86 (BUY). Collected
profit $760.50.