Bid refers to the price one is willing to pay for a security.
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: A member of a Stock Exchange who acts as an agent for clients and buys and sells shares on their behalf […]
Securities issued to existing investors as on a specific cut-off date, enabling them to buy more securities at a specific price.
Ask refers to the price one demands for a security
International Securities Identification Number is a unique identification number allotted for each security in the depository system