What Is a “Volatility Crush”?

A volatility crush occurs when the implied volatility (IV) of an option drops sharply, usually following a major market event like an earnings report or a major news announcement. Since IV is a key component of the option's premium (time value), a crush causes the option price to drop significantly, which is detrimental to option buyers and beneficial to option sellers.

Explain the Term ‘Volatility Crush’ and Its Impact on Option Premiums
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How Does a “Volatility Crush” Impact the Profitability of Options Market Makers?
Which Option Greek Is Most Directly Affected by a Volatility Crush?
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