What it means
An investor might own 100 shares and sell one call with a strike above the market price, so that the shares can be delivered if the call is exercised, and also sell one put with a lower strike, which adds premium but commits the investor to buy 100 additional shares if assigned. The Options Industry Council describes this combination as a covered strangle when the call and put have different strike prices.
Both options are sold, so the investor receives premiums upfront, but those premiums are the price of taking obligations, not a guaranteed net gain. If the stock finishes between the strikes at expiration, both options may expire without exercise, and the investor keeps the shares and the collected premiums, before trading costs and taxes.
The share price can still change during the holding period. If the price rises above the call strike, assignment can require the investor to sell existing shares at that strike, so the investor keeps the premiums but gives up price gains above the call strike on the covered shares, and a rising share price is not entirely captured.
If the stock falls below the put strike, put assignment can require buying an additional block of shares, so the investor then owns more stock after a decline, potentially at a price higher than its current market value. The premiums reduce, but do not remove, the loss.
Consider a $30 stock, a written $33 call and a written $27 put on 100 existing shares: at $35 at expiry, the shares can be called away at $33, while at $20, the put may require another 100 shares bought at $27, leaving two blocks exposed to further declines. The term covered can mislead, because only the call delivery is supported by already owned stock while the put still needs purchasing power.
A broker may require cash or margin, and an investor unable to fund assignment can face a forced liquidation. At expiration, the payoff differs across price ranges: the maximum upside on the initial shares is limited by the call strike, plus premiums, while the downside involves both the original shares and a possible additional purchase, and exact profit depends on the original share purchase price.
Unlike a covered call, this combination includes a short put. It also differs from a long straddle, which buys both options and seeks a large move.
For reporting, show stock cost basis, both strikes, expiration, net premiums, reserved cash and risk if the stock falls sharply. Quoting annualised premium alone hides the risk of doubling a losing position.
In practice
Real-world examples.
Example
An investor owns 100 shares at $30, writes a $33 call and a $27 put, and collects premiums. If the shares finish at $30, both options may expire, leaving the shares and premiums.
Example
The share price drops to $20. Put assignment requires the investor to buy 100 additional shares at $27, while the original 100 have also lost value.
Example
The price climbs to $40. Call assignment can sell the investor's existing shares for $33 each, so the premiums do not restore the forgone upside above $33.
Formula
Calculation
For 100 existing shares bought at $30, one written $33 call and one written $27 put, let total premium be $3 per share across the two options. At a $20 expiry price and put assignment, illustrative combined value after buying the new shares is 200 x $20, against $3,000 original cost + $2,700 new purchase - $300 premiums, for a $1,400 loss before fees. Assignment and timing can change realised results.Case study
Seen in the real world.
Fictional case: A family office owns shares it would sell at $60 and considers selling a call there plus a put at $45. The portfolio manager models the cash needed to buy another 100 shares if the put is assigned. A severe decline would raise exposure to the same company while reducing portfolio value. The office approves only a position size that fits its single-stock limit and records both the sale and additional-purchase scenarios, not merely the premium it receives.
Watch out
Common mistakes.
- Assuming the entire position is fully covered because the call is backed by shares.
- Treating two collected premiums as protection against a large decline.
- Ignoring early assignment, funding needs and the possibility of owning twice as many falling shares.
Questions
People also ask.
What happens if both options expire worthless?
The investor retains the existing shares and premiums, but still bears any change in share value.
Is the short put covered by the existing shares?
No. The put obligates the investor to purchase more shares; it may be cash-secured if sufficient cash is reserved.
Can the shares be sold above the call strike?
If the call is assigned, the investor sells the covered shares at its stated strike and gives up further upside on those shares.
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