What unusual flow means
A trade becomes interesting when size, premium, urgency, and context line up. A large call buy can matter more when volume is high relative to open interest and the trade lifts the offer, but it can still be a hedge or spread leg.
Logic for reading unusual flow
Start with premium size, compare volume to open interest, check whether the trade occurred near the ask or bid, then verify price action, IV movement, and whether related strikes traded as part of a spread.
Example
A $1.2M call print with 8,000 volume against 1,000 open interest and 75% ask-side execution is more notable than a small at-mid trade in a contract that already had heavy open interest.
Risk reminder
Flow is not a signal by itself. It may be a hedge, closing trade, spread leg, or delayed print. Treat it as a research lead, then confirm with the chain, chart, IV, and news.