APIChangelogInfo
Back to Information Home

How is the 'side' of the trade determined in the flow?

Options Flow

The ‘side’ of the trade is determined by a few factors:

  • the bid/ask of the contract at the time of the trade
  • the trade price

Trades taking place at or closer to the NBBO Ask will be labeled ‘ASK’

Trades taking place at or closer to the NBBO Bid will be labeled ‘BID’

Trades taking place at the midpoint will be labeled ‘MID’