Selling options in calm market phases is considered a conservative strategy by many traders. The implied volatility is low, the markets appear stable and the time decay of the options acts as a reliable ally for the writer. Particularly popular in such times are Out-of-the-Money (OTM) options - i.e. those whose strike price is significantly higher or lower than the current price of the underlying asset. Although they only bring low premiums, they are considered "safe" because the market is supposedly moving far away from the strike price. However, this is precisely where an underestimated risk lies, which becomes visible through the normalized vega: the percentage influence of volatility on the option price - and this is often drastically higher with OTM options than with Options at the money.
What is normalized vega - and why is it important?
The Vega measures how much the price of an option changes if the implied volatility of the underlying changes by one percentage point. Although this absolute figure is helpful, it says little about the percentage change in price. Only the normalized vega - i.e. the vega in relation to the option price - reveals how sensitively an option reacts to changes in volatility relative to its value.
1. at-the-money (ATM)
- Option price: 2,50 €
- Vega: 0.12
- Normalized vega = 0.12 / 2.50 = 0.048 → 4.8 %
This means that if the implied volatility increases by one percentage point (e.g. from 15 % to 16 %), the price of the option increases by € 0.12. This corresponds to a price change of 4.8 %. This corresponds to a price change of 4.8 %.
2. out-of-the-money (OTM)
- Option price: 0,30 €
- Vega: 0.04
- Normalized Vega = 0.04 / 0.30 = 0.133 → 13.3 %
Here the absolute vega is lower - only € 0.04. But because the price of the option is so low, the same volatility change of +1 % leads to a relative price increase of 13.3 %.
Although the OTM option has a lower absolute vega, it reacts much more strongly in percentage terms to changes in volatility. For option writers, this means that if volatility rises, the price of the favorable OTM option explodes much faster than expected - relative to the premium received.
This is the core risk of normalized Vega: those who collect small premiums for OTM options are taking on a disproportionately high volatility risk.
The risk of selling OTM options in low-volume phases
In times of low implied volatility, the market is sluggish and expectations of future fluctuations are minimal. It is precisely in such phases that OTM options appear particularly harmless - their premiums are small, their distance from the current price is large, and the risk/reward ratio seems skewed in favor of the seller. But what many overlook: The normalized vega is particularly high in such constellations. As a result, even a moderate increase in implied volatility can cause the price of the option to rise sharply - not in absolute terms, but in percentage terms.
This creates an asymmetrical risk for the writer who sells OTM options in this environment. He collects a small premium, but exposes himself to a disproportionately large potential loss - not only when the market moves drastically, but already when uncertainty returns. This is because the market does not even have to move to the strike to make the option significantly more expensive. The revaluation due to rising implied volatility alone is enough to turn a seemingly calm position into a loss-making transaction. The option "inflates" even though the price of the underlying has hardly changed.
The difference to ATM options - seemingly riskier, actually more robust
Ironically, ATM options appear riskier at first glance because they are more expensive and closer to the current market price. However, they are often more stable relative to the normalized vega. Although they react more strongly to changes in volatility in absolute terms, their premiums are also higher, which means that the percentage effect of a change in volatility is significantly lower. For a writer who consciously deals with the vega risk, selling ATM options can even be more calculable under certain circumstances than selling extremely favorable OTM options in a low-volatility phase.
Use the flip side: Teeny OTM options as favorable vega hedging
As dangerous as the high normalized vega can be for option writers when selling OTM options, it can also be used specifically as a protective instrument. This is because the high percentage sensitivity of these options to changes in implied volatility makes them an efficient hedge against volatility shocks. Puts that are extremely far out of the money - so-called "Teen options", i.e. options with a minimum price (e.g. €0.05 or €0.10).
These seemingly worthless options behave like a kind of insurance: in phases of stable markets, they usually expire worthless - their costs are manageable. But as soon as implied volatility rises sharply, precisely these Options gain considerable value in a short period of time due to their high normalized vega - even if the market price barely approaches the strike. This makes them an effective means of hedging portfolios against sudden uncertainty or tail risks.
For example, a writer who regularly runs short put strategies can build up a kind of "crash reserve" by buying cheap, distant long puts with a very low delta. These positions act like an asymmetric buffer - they cost little, but can compensate for large parts of the losses in the short area in the event of a volatility shock. The high relative sensitivity to IV changes is not a risk here, but a deliberate effect.
Used correctly, teen options can therefore turn the defensive disadvantage of normalized vega into an active advantage - provided you understand their dynamics and use them not in blind hope, but as a structured part of a risk management strategy.
Conclusion: Normalized Vega - low price, high risk
The normalized vega reveals an often overlooked risk in options trading: the lower the option price, the greater the percentage influence of implied volatility. OTM options in particular, which are often sold in calm market phases, actually harbor an asymmetrical risk potential - not only in the event of strong price movements, but also in the event of moderate spikes in volatility. Anyone who collects small premiums in phases of low IV easily underestimates the sudden "blow-up" of these options.
However, this principle can also be reversed. Anyone who understands the behaviour of the normalized Vega can use it specifically for hedging - for example by strategically buying teen OTM options as cheap volatility insurance.
Whether risk or protection: the normalized vega forces option traders to consider the price of an option not in isolation, but in relation to its volatility sensitivity. This is the only way to avoid misperceptions - and to develop strategies that work not only in good weather.
