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In this article we will talk about the power and risk of gamma. To understand gamma, we need to begin with delta, an option’s sensitivity to the underlying price.
For example, a $60 put option may have a delta of -0.20 when the market is at $70. That means the price of the option increases by 0.20 units for every $1 decrease in the underlying price. But here’s the key: delta changes as price changes.
Gamma is the rate of change of delta. It tells you how much your delta will shift as the price moves. And in practice, it tells you how aggressively you need to adjust your hedge to stay neutral.
Imagine you sell a $60 put. When oil trades at $70, the probability of that put finishing in the money is low, so delta is small. But if oil starts to drop toward $60, that probability rises quickly. You now need to sell futures to hedge your increasing exposure.
At $70: Delta ≈ -0.20: Hedge by selling 20 futures per 100 options.
At $60: Delta ≈ -0.50: Now hedge by selling 50 futures.
You’ve just sold an additional 30 futures as price fell. This is the key feature of short gamma: you’re selling into weakness and buying into strength amplifying trends.
Now imagine this happening at scale, across thousands of contracts. If multiple dealers are short gamma and the price nears a major strike near expiry, the hedging flows can become reflexive pushing the price even more and creating a dangerous feedback loop.
Gamma is not static. It is highest at-the-money and increases as expiration approaches.
Picture a bell curve centered around the strike price. When you have a long-dated option (e.g., 6 months out), gamma is relatively modest. But as time to expiry shrinks, the slope of delta near the strike becomes steeper. A small price move leads to a massive change in delta, and thus massive hedging flows.
Near expiry, gamma can spike to extreme levels. For a short option seller, this means:
You must hedge more frequently and aggressively.
Minor price moves can result in outsized P&L swings.
Your risk per contract skyrockets if the price is near the strike.
This is why traders say gamma explodes at expiry. And if you’re short gamma near the money, it becomes the most dangerous time to hold the position.
Let’s look at how this plays out in practice. Suppose you’re short a large quantity of $50 puts in oil, and the market drops to $51 with two days left to expiry.
You’re in the danger zone close enough to the strike that gamma is elevated.
Any move below $50 will rapidly shift delta toward -1.
You’ll need to dump a large number of futures to stay hedged.
But so will every other dealer short those puts.
The collective selling pressure pushes the price further down, triggering even more hedging.
This loop is what creates crash-like dynamics, even in the absence of fundamental catalysts. Dealers trying to stay hedged create the move. And if liquidity is thin, especially during geopolitical events or overnight sessions, the price can gap dramatically.
These gamma-induced spirals have caused numerous blowups:
COVID 2020: Sharp volatility spikes caught short gamma traders off guard.
Oil crash of 2015: Implied volatility exploded as spot prices fell toward key strikes.
Russian invasion (2022): Dealers short upside calls were forced to hedge violently as oil surged.
In each case, the reflexive behavior around strikes and expiry dates led to amplified volatility.
Why Most Blowups Happen at Expiry
The most dangerous combination in options trading is:
Short gamma
At-the-money options
Near expiry
At this point, your exposure is largest and your margin for error is smallest.
Because gamma is a second derivative, the risk doesn’t increase linearly, it increases exponentially. That means the final few days before expiration are when most traders misjudge their exposure.
Especially in illiquid commodities like oil, even small unexpected events, inventory surprises, OPEC rumors, etc. can tip the balance and trigger gamma-driven panic.
Trading Implications: Managing the Risk
If you’re a volatility trader running a short straddle or strangle, there are several ways to manage this gamma risk:
Avoid holding positions into expiry unless you have a directional view or edge.
Roll early: Close or roll your short gamma positions before the last 5–7 days.
Use spreads: A short put spread (vs. naked short puts) caps your exposure while still generating premium.
Track gamma exposure by strike: Be aware of pin risk when price hovers near a large strike.
Monitor realized volatility: If realized spikes above implied near expiry, gamma losses can be catastrophic.
The best traders anticipate where gamma exposure peaks and hedge accordingly, not reactively.
Gamma exposure also amplifies the volatility risk premium (VRP).
When you’re short options, you’re collecting premium because implied volatility exceeds expected realized volatility. But that spread (IV – RV) means nothing without gamma. Your P&L is:
If gamma is small, the spread doesn’t matter. But when gamma is high (near expiry, at the money), even a small miss between expected and realized volatility causes significant P&L swings. This is why gamma is considered the multiplier of VRP.
Gamma is not inherently good or bad. Long gamma means you benefit from volatility but lose on time decay. Short gamma means you collect premium but risk reflexive losses.
What makes gamma dangerous is time and price proximity to strike. As options approach expiration, gamma grows. And if the underlying hovers near the strike, hedging becomes an arms race.
For professional traders, managing gamma is less about prediction and more about position sizing, timing, and risk control. The worst blowups don’t come from being wrong, they come from being exposed when gamma is at its peak.
