20 years: Equity derivatives trading

In this video, Imran explains the meaning of implied volatility and how we can use the BS model to extract it from market option prices. He further discusses how vega is the greek exposure that an options price has to this implied volatility level and finishes with describing structure of volatility and how it can be used to derive forward volatility.

In this video, Imran explains the meaning of implied volatility and how we can use the BS model to extract it from market option prices. He further discusses how vega is the greek exposure that an options price has to this implied volatility level and finishes with describing structure of volatility and how it can be used to derive forward volatility.

13 mins 29 secs

Overview

When there is a significant event on the calendar, such as an election, the forward volatility that can be extracted from the term structure for a time span that captures the event is often elevated. This creates "kinks" in the volatility curve, which traders often buy or sell based on their expectations for the amount of volatility that the event would generate.

Key learning objectives:

Define Implied Volatility and how is it extracted from market option prices through Black-Scholes model

Describe Vega & term structure of volatility

Understand how to calculate weighted vega

Define Forward Volatility

Summary#### What is Implied Volatility?

#### How do we use the Black-Scholes model to extract implied volatility from market option prices?

#### What is Vega & term structure of volatility?

#### How do we calculate weighted vega?

#### What is Forward Volatility?

Implied Volatility of an option is the market’s expectation of future realised volatility of the underlying equity up to a given maturity.

The Black-Scholes formula allows us to convert a fair option price, which is determined from the market by aggregating all buyers and sellers, into an annualised volatility which we call the implied volatility. We can 'imply' the volatility because the other inputs to the model are known and so the only unknown is the volatility which we can then solve for to arrive at our desired option fair value.

Vega is the shift in option value caused by an increase in implied volatility of 1% or 1 vol point. You are Long Vega if you are long an option. As the implied volatility increases, the time value increases and the option gains in value. If the implied volatility went down to zero, the option would lose all its time value and be only worth its intrinsic value (if it had any).

We can trade options of many different expiries. These different expiries or maturities do not have to be priced on the same implied volatility for any given asset. We can see that implied volatility has a term structure, similar to a yield curve in interest rates, when we plot vol on the y-axis and maturity on the X-axis. The shape of that term structure can vary depending on market conditions.

Because of the way the variable of time appears in the BS model, we infer that the acceptable weighting factor to use is 1/sqrt(T), where T is maturity in years. It is also the market convention and accurately reflects how we observe volatility surface changes on a daily basis.

It is the implied volatility for a specific period of time in the future between two points on the curve.

Imran has been an equity derivatives trader for over 20 years and has run European equity index options trading desks for Merrill Lynch and Citibank. He also spent time as a macro portfolio manager at Bluecrest Capital. Currently, Imran runs his own training company specialising in teaching people how to trade options. This is: Options Insight - Traders That Teach, www.options-insight.com

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