"Unusual options activity" is one of the most watched and most misread signals in the market. The raw feed is mostly noise — hedges, spreads, rolls, and market-maker two-sided prints that look directional but are not. The edge is not in seeing big prints; it is in filtering them.
Sweeps vs blocks
Two large prints can mean opposite things:
- Sweeps are a single order split across multiple exchanges to fill immediately. The buyer is paying the spread to get in now — that urgency is the signal. Repeated same-direction sweeps into one strike are the closest thing to a footprint of aggressive, informed positioning.
- Blocks are single large negotiated prints, often institutional. They carry size but ambiguous intent — a block can just as easily be a hedge against a stock position or a rolled position as a fresh directional bet.
Sweeps signal aggression; blocks signal size. Do not treat them as the same thing.
Volume vs open interest: the cleanest filter
The single most useful number is volume relative to open interest at the strike. When today's volume exceeds the existing open interest, the flow is new positioning — not someone closing what they already had. A high Vol/OI sweep on an out-of-the-money strike is a fresh directional bet. Low Vol/OI on the same print usually means a roll or a close, and it carries almost no predictive weight.
Reading the aggressor
Whether a print is buyer- or seller-initiated is the difference between a bullish and a bearish read of the same contract. Trades that print at or above the ask are buyer-initiated — someone lifted the offer. Trades at or below the bid are seller-initiated. This is the Lee-Ready idea, and it is how a signed-flow tape separates aggressive premium buying from premium selling. GEXRadar's flow tools classify the tape this way so you are reading intent, not just volume.
What is noise
- Deep-ITM prints are frequently stock replacement or delta plays, not volatility bets.
- Spread legs. A big call print that is actually one leg of a vertical or a risk-reversal is not the bullish signal it looks like — the position is hedged. Chasing a single leg is the most common unusual-flow trap.
- Expiration and assignment flow spikes volume for mechanical reasons that have nothing to do with a view.
- Two-sided market-maker prints inflate volume without adding directional positioning.
Flow is only half the picture
The same sweep means different things depending on where it lands on the gamma map. A call sweep into a strike where dealers are already long gamma gets faded — the hedging works against the move. The same sweep below the gamma flip, where dealers are short gamma, can ignite a squeeze because the hedging reinforces it. Positioning tells you whether flow will be absorbed or amplified. Read them together.
The takeaway
Great flow reading is subtraction. Start from every large print, strip out the hedges, spreads, rolls, and mechanical volume, weight what is left by Vol/OI and aggressor side, then check it against the dealer-positioning map. What survives that filter is a small, high-signal set — and it is worth far more than a raw "unusual activity" alert.
For educational and informational purposes. Not financial advice; options trading involves substantial risk of loss.