Volume is a misleading metric on its own. A million contracts traded in a name does not tell you anything if 999,000 were retail single-contract bets and 1,000 were a coordinated sweep. The information value is concentrated in the small slice.

The signal-to-noise problem

Markets are mostly noise. Most options activity is hedging, market-making, retail speculation, and rolls. Maybe 1-3% of it carries informational content. The challenge is not seeing volume - it is filtering out the 97%.

Why size matters disproportionately

An informed trader knows their edge is finite and decaying. They size to express conviction before the market closes the gap. Retail does not have that constraint - they buy what they can afford. So when you see a single 5,000-contract sweep on a $4 strike for $2 million in premium, you are watching someone who actually had something to express.

The math of asymmetry

Suppose 100 retail traders each buy a 10-contract OTM call lot - 1,000 contracts total. Then a single institution sweeps 5,000 contracts of the same strike. The institution's position is five times the size of the entire retail crowd combined, paid for in one print. Which side do you think did the analysis?

The right question is never 'how much volume' but 'how concentrated was it.' Volume distributed across thousands of small lots is crowd behavior. Volume concentrated in one or two large prints is decision-making.

How to filter for it

Three thresholds keep you on the right side of the asymmetry: total premium spent (above $250k), Vol/OI ratio (above 5), and trade size distribution (the top 5 prints account for >40% of the volume). When all three are true, you are no longer looking at noise.