Bid-Ask Spread
The Bid-Ask Spread is the gap between the highest price buyers will pay and the lowest price sellers will accept — a direct measure of liquidity and trading cost.
Bid-Ask Spread = Ask Price − Bid PriceWhat the Bid-Ask Spread Means
The Bid-Ask Spread is the difference between the bid (the best price a buyer is offering) and the ask (the best price a seller is asking). To buy immediately you pay the ask; to sell immediately you receive the bid. The spread is the cost of crossing the market — effectively a built-in transaction cost on every round trip.
A tight spread signals a liquid, actively traded option; a wide spread signals thin liquidity, where entering and exiting is more expensive.
Why the Spread Matters
The spread is real money lost to slippage, especially for active or multi-leg traders. Wide spreads erode the edge of high-frequency strategies and make far OTM or far-dated strikes costly to trade. Liquidity also affects fill quality — in a wide market, using limit orders rather than market orders helps avoid paying the full spread.
Bid-Ask Spread in the Indian Market
ATM and near-ATM Nifty and BankNifty weekly options are extremely liquid with razor-thin spreads, while far OTM and far-month strikes can show wide, costly spreads. Traders building condors and butterflies must factor spread cost across all legs. Quintal Mind streams live bid and ask across the chain so liquidity and spread cost are visible per strike before you trade.
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