Put Option
Definition
A put option gives the buyer the right — but not the obligation — to sell 100 shares of the underlying stock at the strike price before the expiration date, allowing traders to profit from declining stock prices or hedge existing long positions against downside risk.
Example
“I thought the stock was going to sell off after earnings but I didn't want to short the stock outright. I bought a $50 put with the stock at $52 — paid $1.80 in premium. Stock dropped to $46 post-earnings and the put was worth $4.80. Clean.”
Detailed Explanation
A put option is the directional tool for bearish trades in options. When you buy a put, you're paying premium for the right to sell shares at a fixed price even if the market price has fallen below that level. If the stock is at $46 and you own a $50 put, you can sell shares at $50 when the market only offers $46 — that's $4 of intrinsic value. You can exercise that right, or more commonly, sell the option itself for close to that intrinsic value plus any remaining extrinsic value. You don't actually need to own the stock to profit from a put — you just need the put to increase in value.
Puts are used in two main ways: directional bearish speculation (buying puts to profit from expected declines) and hedging (buying puts against existing long positions to cap downside risk). As a hedge, puts function like insurance — you pay the premium (the "insurance cost") and in exchange, if the stock declines below the strike, the put gains value to offset your loss on the underlying shares. This is why institutions and funds constantly buy puts against their portfolios — not because they expect a crash, but as catastrophic-loss protection. The premium is a known cost; the unhedged downside risk is not.
The same dynamics that affect calls affect puts: delta measures how much the put moves per $1 decline in the stock (put delta is negative, ranging -1 to 0), theta erodes the time value each day, and IV affects the extrinsic premium you pay. One unique consideration with puts: they get more expensive as the stock falls and IV spikes (because market fear drives up volatility), meaning if you wait to buy puts after a selloff has already started, you're paying much higher premiums than you would have in calm conditions. Buying portfolio protection in low-volatility environments, before the drop, is structurally cheaper than panicking into protection mid-selloff.