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Long Put

Where the investor expects the price of the underlying stock to fall, the bought put provides leveraged exposure to the price fall. Buying a put option is one of the few ways investors can speculate on a falling share price. Put options may also be used to protect an investor's holding in the underlying stock.

When to  use the long put
Market outlook falling
Volatility outlook rising

Payoff diagram

long put payoff diagram 

The long put
Construction long put X
Point of entry market around X, but can vary
Breakeven at expiry strike price less premium paid
Maximum profit at expiry strike price less premium paid
Maximum loss at expiry limited to premium paid
Time decay hurts
Margins to be paid? no

Profits and losses

The maximum loss the investor can suffer is the premium paid for the option, which will occur if the share price at expiry is above the strike price. The investor breaks even if at expiry the share price is equal to the strike price of the option less the premium paid. As the share price falls beyond this point, the potential profits of the bought put are limited only by a fall in the share price to zero.

Other considerations

  • Time decay: time decay works against the buyer of the put. If the expected share price fall does not take place soon after entering the position, time decay will start to erode the value of the option.
  • Strike price: the investor must balance the cost of the option against the fall in share price required for the strategy to be successful. The out-of-the money option will be the cheapest, but also requires the largest fall in share price. 

If the investor is buying a put to protect a shareholding, the cost of the option must be weighed up against the protection required. The in-the-money option locks in the highest sale price for the underlying shares, but also is the most expensive option.

Follow-up action 

If the share price fall takes place as expected, the put option taker must decide whether to close out at a profit, or maintain the position in the hope of a further increase in price. The longer the option position is left open, the greater the effect of time decay.

If the share price does not fall as expected, it is often advisable to close out the position in order to recover some time value from the position.

At expiry, the holder of an in-the-money put option would usually close out the position, rather than exercising (unless they own the underlying shares). If the put has been bought to protect a shareholding, the investor must decide whether they want continue holding the stock, in which case the put would be sold, or sell the shares, in which case the option would be exercised.

Points to remember

  • Only buy puts when you expect the share price to fall, and volatility to increase.
  • If the expected share price fall does not eventuate, be prepared to take a small loss by exiting the position, rather than holding on until expiry and possibly watching your option expire worthless.
  • As a shareholder, it is not practical to have protection in place 12 months of the year. This strategy is suitable for shorter periods when you fear a market downturn.

Example

ABC Limited is a construction company that has had a strong run up in price to $10.00. You believe that with the economy slowing, the price has run too hard, and is likely to fall back to around $9.00. To gain exposure to this fall, you buy a put option.

Buy 1 Jun $10.00 Put @ $0.40

long put payoff diagram

Disclaimer
The information contained in this webpage is for educational purposes only and does not constitute financial product advice. ASX does not represent or warrant that the information is complete or accurate. You should consider obtaining independent advice before making any financial decisions. To the extent permitted by law, no responsibility for any loss arising in any way (including by way of negligence) from anyone acting or refraining from acting as a result of this material is accepted by ASX.

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