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In-the-Money Puts are Cheaper than Out-of-the-Money Calls

Looking at historical options and stock price data in conjunction, I've noticed that puts are systematically cheaper than calls, e.g. in the money puts are cheaper than out of the money calls, which does not make sense. My impression is that, for some reason, historical stock prices are lower than their actual values. That appears to be the case at least for SPY, where I compared it with the data I get from my broker, and it also appears to be the case for IBM.

In the last row of the table below, strike > stock, meaning put is in the money, and call is out of the money, and yet the put price is lower than call price.

      dateexpirystrikestockcallputdays to maturity2018-01-022018-12-21257.0259.62471122.425010.1100352.02018-01-022018-12-21258.0259.62471121.700010.3750352.02018-01-022018-12-21259.0259.62471120.955010.6450352.02018-01-022018-12-21260.0259.62471120.245010.9250352.02018-01-022018-12-21261.0259.62471119.545011.2150352.02018-01-022018-12-21262.0259.62471118.845011.5100352.0
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Are you sure you use raw data for both options AND the underlying assets?
Something like : security.SetDataNormalizationMode(DataNormalizationMode.Raw)?

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.


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