You may have seen Wall St. Jesus post options flow tables for individual names throughout the trading day. Here is how to interpret each column in the table:
Volume: the number of contracts traded today.
โBid: the percentage of orders that are filled at the bid. When closer to the bid. This could indicate that they are rolling an option (closing one order near the ask and buying a different strike near the bid). Or it could also indicate that the options are being sold.
Mid: the percentage of orders that are filled between the bid and the ask.
Ask: the percentage of orders that are filled at the ask. This could indicate that the options are being bought.
IVol: Implied Volatility
Comments: An opening order indicates that the expiration line and strike is a new bet. This means that there is more conviction in the trade versus tack-on buying. An opening order indicates that a player is not rolling up and using profits to extend the trade.
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