Understand the net Greeks of a bear put debit spread and how they evolve as price moves between and beyond its strikes.
Negative delta
The higher-strike long put normally has more negative delta than the lower-strike short put contributes positively, leaving net negative delta. It can approach zero far above or below both strikes.
Gamma
The long put adds positive gamma and the short put negative gamma. Net gamma is often positive near entry but changes with moneyness, volatility and time.
Theta and vega
The spread commonly begins with modest negative theta and positive vega. Both are smaller than for the long put alone and can change sign in some price regions near expiration.
Calculate position exposure
Multiply each leg's Greek by signed quantity and contract multiplier, then add the legs. Recalculate after price, time or volatility changes rather than treating entry Greeks as permanent.
A practical example
If the long put delta is −0.58 and the short put delta is −0.25, net spread delta is about −0.33, or roughly −33 share equivalents per standard spread.
This simplified example focuses on the spread at a specific moment and expiration outcome. Live option prices also reflect the underlying price, time decay, rates, dividends, liquidity and transaction costs. Greeks are theoretical estimates, not guarantees.
Frequently asked questions
Is delta always negative?
Normally, but it approaches zero at extreme prices.
Is theta always negative?
No. Its sign can change by moneyness and time.
How is net vega found?
Subtract the short put's vega from the long put's vega.
Continue the Bear Put Spreads cluster
Explore related guides: How Implied Volatility Affects a Bear Put Spread · Bear Put Spread: 12 Mistakes to Avoid · How to Choose Bear Put Spread Strikes. For a structured sequence, use the free Level 10 – Bear Put Spread course.
Options involve risk and are not suitable for every investor. This material is educational and is not investment, tax or legal advice. Greeks are theoretical estimates, and contract terms and broker requirements can vary.