Best Ask

DEFINITION of 'Best Ask'

The lowest quoted offer price among all those offered by competing market makers for a particular trading instrument. The ask price is effectively the lowest price that a seller is willing to offer for an asset, and the best ask is the most favorable ask price offered at a given time for a particular security. Ask is also known as the offer price.


The National Best Bid and Offer (NBBO) are the bid and ask prices that traders and investors typically see. Active traders, short-term traders and day traders often study Level 2 quotes that include all the current bids and asks for a particular trading instrument. The NBBO is continually updated throughout the trading session, so that customers have access to these prices.