Put Options
Market MechanicsA contract that gives you the right to sell 100 shares at a fixed price before expiry — the standard way to profit from, or hedge against, a stock falling.
A put option grants the holder the right, but not the obligation, to sell 100 shares of the underlying security at the strike price on or before expiration. Long puts appreciate in value as the underlying declines — the option's intrinsic value equals the strike price minus the current price when the option is in-the-money. Put options serve dual institutional purposes: speculative short exposure with defined maximum loss (the premium paid), and portfolio hedging — purchasing puts on index ETFs or individual positions to establish a price floor on losses. Put-call parity is the foundational arbitrage relationship between puts and calls of the same strike and expiry. Negative delta (puts lose value as the underlying rises) and positive vega (puts gain value as volatility increases) are the defining Greeks.
Puts serve two purposes: speculation (you think the stock is going down) or hedging (you own the stock and want downside protection). The strategy determines your strike and expiry choice. Hedges typically use OTM puts 5–10% below current price; speculative puts may target strikes further OTM for higher leverage.
Your breakeven at expiry is strike price minus premium paid. A $90 put on a $100 stock costing $3 premium breaks even at $87. The stock needs to fall below $87 for the trade to be profitable at expiry. Above $90, the option expires worthless.
Put delta is negative (typically −0.50 for ATM). If the stock falls $1, the put gains ~$0.50 per share. As the stock continues to fall, delta approaches −1.0, meaning the put moves almost dollar-for-dollar with the stock decline — full downside capture with only the premium at risk.
Unlike calls — where you want the stock to move up smoothly — puts benefit from volatility spikes even before the stock falls. When markets panic, implied volatility spikes sharply (this is why the VIX is called the 'fear index'), inflating put premiums. Puts bought before a volatility event often gain value immediately as fear enters the market.
March 2020 COVID crash: a trader who bought SPY (S&P 500 ETF) $280 puts in late February 2020 when SPY was at $330, paying ~$5 premium, saw those puts explode to $50+ as SPY crashed to $220 in three weeks — a 900%+ return on premium. This is why sophisticated investors buy portfolio insurance during periods of low volatility (cheap premiums) rather than during crashes (when premiums have already exploded).
Puts have the same timing problem as calls — the stock needs to move in your direction before the option expires. Shorting a fundamentally broken company via puts is a classic trap: you can be completely right about the thesis but wrong about timing, and watch your puts expire worthless multiple times before the stock eventually falls. Buying puts on stocks in strong uptrends (trying to call the top) is a particularly expensive habit. Always size put positions as portfolio insurance, not as primary positions.