The Protective Put
Insurance for a stock holding — pay a premium to cap your downside.
A protective putBuying a put to insure a stock holding against a fall. is the mirror of the covered callSelling a call on stock you own to earn income.: you own a stock and buy a putThe right, not the obligation, to buy or sell at a set price. against it. The putThe right, not the obligation, to buy or sell at a set price. gives you the right to sell at the strikeThe fixed price at which an option can be exercised., putting a floor under your position. It’s literally insurance for your holding.
- Setup — own the stock, buy a putThe right, not the obligation, to buy or sell at a set price. (the floor); your downside below the strikeThe fixed price at which an option can be exercised. is now capped.
- You keep — full upside if the stock rises (minus the premium paid).
- You pay — the premium (insurance cost); your max loss = (entry − strikeThe fixed price at which an option can be exercised.) + premium.
Isn’t paying for protection all the time too expensive?
Yes — constant put-buying is a drag that can erode returns, just like over-insuring. Protective puts are best used *selectively*: ahead of a known risk (earnings, a feared event), to lock in large unrealised gains, or during turbulent periods — not as permanent coverage. The collar (later) cheapens it by selling a call to fund the put.