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Buy To Open Put Option. A short position is when you have borrowed a stock from a broker, and try to sell it. A put option locks in the selling price of a stock.
from venturebeat.com
Overall, buying to open gives the opportunity to see significant gains. In other words, the trader is buying the option to establish a position in the market. Buy it or sell it.
A put option locks in the selling price of a stock. A buyer can purchase the option, which you then plan to buy back at a later time (sell to open, buy to close). The actual orders used would be “buy to open or “sell to open. It is particularly effective if you use a buy to open a put option that is out of the money at the same time as purchasing the underlying stock.