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Top of Book

Top of Book (Best Bid/Offer) market data contains all top bid, bid size, top ask, ask size, last trade, trade volume, and timestamp data for exchange traded products.

Source (with edits): https://www.cmegroup.com/confluence/display/EPICSANDBOX/Top+of+Book+-+BBO

Top of Book data forms part of the Order Book, other parts of the Order Book include Depth of Market (or Level 2 data)

Also abbreviated as ToB and BBO.

Also know as Level 1 data.

See also:
https://en.wikipedia.org/wiki/Financial_quote
https://en.wikipedia.org/wiki/Order_book_(trading)



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