Bid Price
The highest price a buyer will pay right now — what you receive when you sell an option at market.
Definition
The bid price is the highest price any participant in the market is currently willing to pay to buy an option contract. It sits on the opposite side of the ask price in the order book. When you sell an option — either to close a long position or to write (short) a new one — a market sell order executes at the bid. The bid is always lower than the ask; the difference between them is the bid-ask spread.
Why it matters
For option writers (sellers), the bid price is the premium they actually receive when selling to open. In theory the option may be worth ₹150 at mid-price, but if the best bid is only ₹147, that ₹3 gap per unit reduces actual inflow by ₹225 per Nifty lot. Across a portfolio of short strikes this friction accumulates significantly over a month of trading.
Bid prices are also a fast gauge of demand. When market participants are aggressively buying a particular strike — say, because of a sudden move in the underlying — the bid rises quickly as buyers compete. Conversely, a collapsing bid on a position you are holding long signals that buyers have stepped away; attempting to exit now means accepting a harsh price. This scenario is most acute for deep OTM options near expiry on NSE, where bids can effectively disappear during sharp reversals.
Regulators and exchanges also use the bid when computing settlement values and margin requirements. SEBI's peak margin framework, introduced in 2021, requires brokers to check margins at up to four snapshots during the day — at those moments, the bid on your short option positions determines your mark-to-market liability.
How it works
The bid is set by the highest-priced buy limit order resting in the exchange's order book. On NSE's NEAT system, all incoming buy orders are ranked by price — the highest buy limit order is the best bid. If that order gets matched against a sell, the next-highest buy order becomes the new best bid. The bid updates continuously during market hours (9:15 AM to 3:30 PM IST) and can move in ₹0.05 increments for most equity derivative contracts.
Example
Say you hold a Bank Nifty 50,000 CE bought last week at ₹200. Today the option is showing a bid of ₹310 and an ask of ₹313. If you place a market sell order, you exit at ₹310 per unit. The lot size for Bank Nifty is 35 units, so you receive ₹10,850. Had you placed a limit sell at ₹311.50 (the mid), and a buyer accepted, you would have received ₹10,902.50 — a ₹52.50 improvement for a few seconds of patience. In liquid Bank Nifty strikes near ATM, limit orders close to the mid typically fill within one to three seconds during normal market hours.
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