Strategy Greeks

Bear Spread: Greek Profile

A bear put spread — long a higher put, short a lower put — is net negative Delta with small and shifting Gamma, Theta and Vega, a defined-risk bearish trade whose secondary Greeks are largely neutralised by the short leg.

Quick answer: A bear put spread — long a higher put, short a lower put — is net negative Delta with small and shifting Gamma, Theta and Vega, a defined-risk bearish trade whose secondary Greeks are largely neutralised by the short leg.

Simple explanation

You buy a put and sell a lower-strike put against it, giving a bearish position with capped profit and capped loss. The short leg funds part of the long put and cancels most of the Vega plus much of the Theta and Gamma you would carry from a plain long put. The result is a clean bearish bet: net Delta is negative but modest, and the trade is far less sensitive to volatility and time than a naked long put — useful because buying puts outright often means overpaying for skew-inflated IV.

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Bear Spread: Greek Profile

Loss is capped at the net debit above the higher strike; profit is capped at the strike difference minus the debit below the lower strike at expiry.

Detailed explanation

Delta: negative but capped

The long higher put has more negative Delta than the short lower put, so net Delta is negative — you are bearish. With Nifty at 24,500, long the 24,500 put (Delta −0.48) and short the 24,200 put (Delta −0.31) gives net Delta about −0.17 per unit. Net Delta is strongest between the strikes and fades toward zero once Nifty falls well below the lower strike, because both legs approach Delta −1 and offset — this caps the profit.

Gamma: nearly netted out

The long put is long Gamma and the short put is short Gamma, so net Gamma is small. Between the strikes it is mildly positive; below the short strike it turns mildly negative. Compared with a naked long put, the spread sacrifices the explosive downside acceleration of a crash in exchange for a cheaper, defined-risk structure.

Theta: much reduced

A naked long put bleeds full Theta; the short put in a bear spread collects Theta, offsetting most of it. Net Theta is small, mildly negative when the spread is OTM and able to turn slightly positive when Nifty is below the short strike and the spread is deep ITM. This lets a bear spread wait out a slow decline far better than a naked put that decays while you wait.

Vega: largely neutralised

The key advantage against Nifty's downside skew. The long put's positive Vega and the short put's negative Vega roughly cancel, so net Vega is small. You are not paying full price for skew-inflated put IV, and you are protected from a Vega loss if volatility subsides after you enter. When OTM the spread is slightly long Vega; when ITM it turns slightly short Vega.

Net Greeks of the bear put spread

Greek	Position	What it means
Delta	Net negative, modest	Bearish exposure, strongest between the strikes, fading to zero below the lower strike.
Gamma	Small (near netted)	Mildly positive between strikes, mildly negative below — far less curvature than a naked put.
Theta	Small	The short put offsets most decay; slightly negative when OTM, can turn positive when deep ITM.
Vega	Small (near netted)	Legs cancel most volatility exposure, avoiding overpayment for skew-inflated put IV.

Practical example (Nifty)

Illustrative — Nifty spot 24500, lot size 75

Nifty at 24,500. Buy the 24,500 PE at ₹170 and sell the 24,200 PE at ₹80, net debit ₹90 x 75 = ₹6,750 — the maximum loss. Maximum profit is the strike gap minus debit: (300 − 90) x 75 = ₹15,750, reached if Nifty closes at or below 24,200 at expiry. Net Delta about −0.17, net Vega near zero. If Nifty falls 150 points to 24,350, the spread gains roughly net Delta times the move — around 0.17 x 150 x 75 = ₹1,900 — with little Vega distortion even if India VIX moved, unlike a naked long put whose value would swing sharply with the volatility spike.

Why it matters in practice

A defined-risk bearish trade with both maximum profit and maximum loss known at entry.
The short leg neutralises most Vega, so you avoid overpaying for Nifty's skew-inflated put IV.
Net Theta is small, so the spread waits out a slow decline far better than a naked long put.
Profit is capped — you trade a naked put's crash-convexity for lower cost and defined risk.

Common mistakes

Placing strikes too close together, capping profit so tightly the trade barely pays even when Nifty falls.
Expecting a bear spread to explode like a naked put in a crash — its netted Gamma deliberately dampens that convexity.
Holding past the lower strike expecting more gains, when net Delta has already faded to zero and profit is capped.
Choosing very wide strikes that push cost and loss toward an outright put, defeating the purpose of spreading.

Professional usage

Professionals use bear put spreads to express a controlled bearish view without overpaying for the elevated IV that Nifty and Bank Nifty puts carry due to downside skew. They set the short strike near their downside target so maximum profit aligns with the expected move, and because net Vega is small they can hold the position through a volatility spike without a nasty Vega reversal. They often prefer the spread over a naked put precisely when IV is already high, capturing direction while sidestepping the volatility premium, and they take profits early once most of the spread's value is realised.

Key takeaway

A bear put spread is a bearish Delta trade with its Gamma, Theta and Vega deliberately muted by the short leg — you accept capped profit for lower cost, defined risk and freedom from overpaying Nifty's skew-inflated put volatility.

Frequently asked questions

What is the Greek profile of a bear put spread?

Net negative Delta with small net Gamma, small net Theta and small net Vega. The short put neutralises most secondary Greeks, leaving a clean, defined-risk bearish bet.

Why use a bear spread instead of buying a put?

Nifty puts carry skew-inflated IV, so a naked put overpays for volatility. A bear spread's near-zero net Vega avoids that and protects against a Vega loss if volatility subsides.

What are the maximum profit and loss on a bear put spread?

Maximum loss is the net debit paid; maximum profit is the strike difference minus that debit. Both are fixed at entry, making it a defined-risk trade.

Why isn't my bear spread gaining even though Nifty fell?

Its net Delta is modest and fades below the lower strike. Once Nifty drops past the short strike, both legs offset and the spread stops gaining — profit is capped.

Is a bear spread long or short volatility?

Close to neutral. The long and short puts' Vegas roughly cancel, so the spread is only slightly long Vega when OTM and slightly short when ITM — far less than a naked put.

How should I choose strikes for a bear spread?

Match the width to your expected fall and budget, and place the short strike near your downside target so maximum profit lines up with where you expect Nifty to land.

Does a bear spread decay with time like a long put?

Much less. The short put collects Theta that offsets most of the long put's decay, so net Theta is small and the spread waits out a slow decline far better.

Sources & references

Last reviewed 7 July 2026. Educational content only — not investment advice.