Vega Options, Explained
Editor's Note: Options are not suitable for all investors. Options involve risks, including substantial risk of loss and the possibility an investor may lose the entire amount invested in a short period of time. Please see the Characteristics and Risks of Standardized Options.
Options investors rely on a set of risk metrics known as the Greeks to evaluate how different factors influence the price of an options contract. One of these metrics, vega, measures how sensitive an option’s price is to changes in implied volatility.
Understanding vega can help investors anticipate price fluctuations, develop hedging strategies, and assess risk when trading options.
Key Points
• Vega measures the sensitivity of an option’s price to changes in implied volatility.
• Higher vega values occur with more time to expiration, leading to greater price sensitivity.
• Vega is highest for at-the-money options and decreases as options move in- or out-of-the-money,
• Vega-neutral strategies balance portfolio risk by offsetting long and short positions.
• Vega helps investors anticipate options price movements, informing their trading decisions.
What Is Vega in Options Trading?
Vega is one of the Greeks more commonly used in options trading — along with delta, theta, and gamma. The Greeks are a set of indicators that quantitative analysts and investors use to measure the effect of various factors on the prices of options contracts. Investors can use the Greeks to hedge against risks involved in options trading. Each indicator in the Greeks helps analysts to understand the level of risk, volatility, price direction, value over time, or interest rate of a particular options contract.
As a unit of measure, vega tries to assess, theoretically, the amount that an option’s price will change with every percentage point change in the implied volatility of the underlying asset. So, vega reflects how sensitive a contract is to changes in the implied volatility of its underlying security. When an underlying asset of an options contract has significant and frequent price changes, then it has high volatility, which also makes the contract more expensive.
How Vega Works
Vega, as noted above, measures the sensitivity of an option’s price to changes in the implied volatility of its underlying asset. Vega changes over time as the price of the underlying asset changes and the contract moves closer to its expiration date. Because vega is always changing, investors tend to track it on an ongoing basis while they are invested in an options contract.
When options still have time remaining before expiration, the vega is said to be positive. Vega decreases when an options contract nears its expiration date. This is because longer-dated options have more time for the underlying asset to move, which increases the likelihood of volatility. This also creates more potential for profit or loss. That added uncertainty makes these options more expensive, resulting in higher premiums. When an option’s vega is higher than the amount of the bid-ask spread, it often indicates a more liquid option with a tighter spread. If vega is lower than the bid-ask spread, it may indicate wider spreads and lower liquidity.
Implied Volatility
Implied volatility is an estimate of how much the price of an underlying security may fluctuate in the future. In pricing options, implied volatility is mostly used to predict future price fluctuations. Traders sometimes use a sigma symbol (𝞂) to represent implied volatility.
Traders use options pricing models to calculate implied volatility. These models try to estimate the speed and amount that an underlying security’s price changes — known as its volatility. As the volatility of the underlying asset shifts, its vega also changes. Pricing models can estimate volatility for present, past, and future market conditions. But, as the calculation is just a theoretical prediction, the actual future volatility of the security may differ.
Characteristics of Vega
Vega measures how sensitive an option’s price is to changes in implied volatility and indicates how much the price could theoretically move for every percentage point shift in the underlying asset’s volatility. The effect of vega on options trading depends on various factors, including time to expiration and the moneyness of an option.
• Vega relates to the extrinsic value of an option, not its intrinsic value.
• Vega is positive when an investor purchases calls or puts. It is negative when writing options.
• An investor’s exposure to vega depends on their position. Long positions have positive exposure, while short positions have negative exposure.
• Vega is higher when there is more time until the option expires, and it’s lower when the option is close to expiring.
• When the option is at the money, vega is highest.
• When the option is in- or out-of-the-money, vega decreases. In other words, Payvega is lower when the market price of the underlying security is farther from the option strike price.
• When implied volatility increases, the option premium increases.
• When implied volatility decreases, the option premium decreases.
• When gamma is high, vega is generally also high. Gamma measures the rate of change in an option’s delta (its price sensitivity to changes in the underlying asset), indicating how much delta will shift as the underlying asset’s price moves.
• Vega can also be calculated for an entire portfolio of options to understand how it is influenced by implied volatility.
What Does Vega Show?
Vega, again, represents the estimated amount that an option’s price could change with every 1% change in the implied volatility of the underlying asset. It can also be used to show the amount that an option’s price might change based on the expected volatility of the underlying security — that is, how often and how much the security’s price could change.
Investors generally omit the percentage symbol when referring to vega, or volatility. And some analysts, too, display it without a percentage symbol or decimal point. In that case, a volatility of 16% would be displayed as “vol at 16.”
Vega Options Example
Let’s say stock XYZ has a market price of $50 per share in February. There is a call option with a March expiration date with a strike price of $52.50. The option has a bid price of $1.50 and an ask price of $1.55.
The option’s vega is 0.25, meaning that the option’s price is expected to change by $0.25 for each 1% increase in implied volatility. In this example, we assume an initial implied volatility of 30%, which is a typical level for moderately volatile stocks.
Since the option has an implied volatility of 30%, it is moderately sensitive to changes in market expectations. A higher implied volatility often corresponds with a wider bid-ask spread, while lower volatility can result in a tighter spread. A tighter spread does not mean the trade will be profitable or that it is automatically a good trade to enter into, but it is a positive sign. Traders monitor vega closely around earnings announcements and major economic events, as these often cause shifts in implied volatility, impacting option premiums.
Assume the implied volatility of the underlying security increases to 31%. This changes the option’s bid price to $1.75 and changes the ask price to $1.80. This is calculated as follows, with 0.01 representing the 1% increase in implied volatility:
Conversely, if the implied volatility decreases by 5%, the bid price would decrease to $0.25, and the ask price would decrease to $0.30. Lower implied volatility reduces the likelihood of large price swings, decreasing the value of options as traders anticipate less movement in the underlying stock.
The following shows how the increase in vega impacts the prices in the bid ask spread:
• Original bid price: $1.50
• Vega impact: $0.25 (0.01 x 0.25)
• New bid price: $1.75
• Original ask price: $1.55
• New ask price $1.80
How Can Traders Use Vega in Real-Life?
Traders often analyze vega alongside the other Greeks (delta, theta, and gamma) to assess an option’s sensitivity to market factors. Delta measures price movement, and Theta tracks time decay. Vega helps traders understand how changes in implied volatility can impact options pricing. Vega has a significant effect on options prices, so it is a very useful analytic tool.
Benefits of Vega
If investors take the time to understand implied volatility and its effect on options prices, they’ll find that vega can be a useful tool for making predictions about future options price movements. It can also help them understand the risks of trading different types of options contracts. Analyzing an option’s implied volatility can guide investors as they select which options to buy and sell.
Some traders even utilize changes in implied volatility as part of their investing plan, such as with strategies like the long straddle and short straddle. Vega plays a key role in using these types of options trading strategies.
Vega Neutral: Another Strategy
For investors who want to limit their risk in options trading, the vega neutral strategy can help them hedge against the implied volatility in the market of the underlying security. Investors use the vega neutral strategy by taking both long and short option positions on different contracts within a portfolio, aiming to offset the volatility changes. By doing this, they create a balanced portfolio that has an average vega of around zero. A vega-neutral portfolio is structured to minimize the impact of changes in implied volatility, potentially reducing the portfolio’s level of risk.
The Takeaway
Vega, one of the Greeks, along with the concept of implied volatility, relates to advanced options trading techniques, appropriate for experienced investors.
Understanding vega can help investors navigate changing market conditions and make more informed decisions about options pricing. Whether using vega to gauge volatility risk, develop hedging strategies, or refine an options trading approach, incorporating this Greek into an overall strategy can be a valuable tool for managing risk and weighing potential returns.
Investors who are ready to try their hand at options trading despite the risks involved, might consider checking out SoFi’s options trading platform offered through SoFi Securities, LLC. The platform’s user-friendly design allows investors to buy put and call options through the mobile app or web platform, and get important metrics like breakeven percentage, maximum profit/loss, and more with the click of a button.
Plus, SoFi offers educational resources — including a step-by-step in-app guide — to help you learn more about options trading. Trading options involves high-risk strategies, and should be undertaken by experienced investors. Currently, investors can not sell options on SoFi Active Invest®.
Photo credit: iStock/gorodenkoff
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Options involve risks, including substantial risk of loss and the possibility an investor may lose the entire amount invested in a short period of time. Before an investor begins trading options they should familiarize themselves with the Characteristics and Risks of Standardized Options . Tax considerations with options transactions are unique, investors should consult with their tax advisor to understand the impact to their taxes.
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