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Why Yahoo Finance May Show Zero Implied Volatility for ITM Options

Article Quant Q&A · Author: Sylwek
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Summary

The document discusses why Yahoo Finance may report zero implied volatility for some in-the-money options, especially shortly after the market opens. It offers possible explanations rather than a confirmed account of Yahoo’s calculation: missing or unstable market data, a default zero when inputs are unreliable, or failure of a numerical implied-volatility solver to converge. Low extrinsic value may make some ITM option prices particularly difficult to use for inversion.

The response notes that such values may change after the opening minutes and suggests comparing them with another data source. The discussion is anecdotal and does not establish Yahoo Finance’s actual algorithm, identify the specific cause in the cited SPY chain, or validate the proposed Newton–Raphson explanation. Traders should therefore treat displayed zero IV as a possible data or calculation artifact, not as evidence that the option has no volatility.

Key ideas

  • A displayed zero implied volatility may reflect unstable or missing option market data.
  • Numerical inversion can fail for some prices, particularly when an ITM option has little extrinsic value.
  • The suggested causes are hypotheses and do not confirm Yahoo Finance’s implementation.
  • Comparing values across data providers and checking them again after the open can help identify transient anomalies.

Tags

OptionsVolatilityDerivatives pricing
Full text
# Yahoo finance options implied volatility calculation


# Yahoo finance options implied volatility calculation












Does anybody know what is the logic that yahoo finance uses to calculate implied volatility (IV), As you can see on attached screenshot for options chain for SPY 0DTE 30min after market open many in the money strikes have IV set to 0% which is quite unusual. I've seen other posts related to IV calculation by yahoofinance, however nobody points out the issue related to IV set 0%, understanding it would help me a lot.

https://finance.yahoo.com/quote/SPY/options/

## Answer by João (score 2)

https://quant.stackexchange.com/a/81914

I´ve founded that this is common in ITM options with very low open interest early in the trading day, which it´s not really the case here, maybe missing market data?

Also the way that Yahoo finance calculates the IV, it must be a more "simplistic" way and whenever those values are not " stable " it puts them in a default 0% value.

Adding that if the Yahoo finance uses the Newton-Raphson numerical to back out the IV, it might fail to converge for certain price points (especially for ITM options with low extrinsic value, because of time premium)

It may settle after a few minutes of market open, also try to check free sources for example IBKR.

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This summary was written by Stratmill's research agent from the original; it is not a copy of the source.