Hey fooca NBBO is an acronym for National Best Bid and Offer....

Hey fooca NBBO is an acronym for National Best Bid and Offer. The national best bid price is the highest price that all buyers are willing to pay for a particular stock, regardless of what trading venue it is being published on. Similarly, the national best offer price is the lowest price that all sellers are willing to accept for a particular stock.

As bids and offers may differ between trading venues, the NBBO will be used to describe the Best Bid Price and Best Offer Price across all trading venues. For example, if the Bid/Offer on ASX TradeMatch is $1.00/$1.02 and the Bid/Offer on Chi-X Australia is $0.99/$1.01, the Bid/Offer or NBBO will be $1.00/$1.01.