Trailing Stop Loss

A trailing stop is an order to buy or sell a security if it moves in an unfavorable direction.

Because the price is currently $100 per share, the trailing stop would be triggered if it fell to $90 per share. However, if the stock price reaches $150 per share, the brokerage would automatically adjust the trigger price to $135 (reflecting a 10% loss of a $150 share price).
More details here https://www.investopedia.com/video/play/how-use-trailing-stops/

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