You are unaware that your information is very wrong. Even F&O scrips have circuit filters. Every stock has a circuit filter irrespective of whether F&O or not. However, for F&O stocks circuit filters are
removed at the discretion of the Exchange in consideration with volatility, liquidity etc and trading continues normally.
Attaching a quote of Reliance from NSE. You can see upper and lower Bands for the day i.e circuit levels.
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