Unusual Whales alternatives in 2026: prices and scope, compared honestly.

Aggregate gamma position of market makers (dealers) across listed options for an underlying. Measures where dealer hedging flow is likely to concentrate. Educational context, not a signal.

Strike with the largest concentration of call open interest. Dealers who sold those calls must sell the underlying as price rises toward the strike, creating a structural resistance zone. See the deep dive.

Strike with the largest concentration of put open interest. Dealers who sold those puts buy the underlying as price falls toward the strike, creating a structural support zone.

Price where aggregate dealer gamma switches from positive (long gamma) to negative (short gamma). Above it, hedging dampens moves; below it, hedging amplifies them. See what is the Gamma Flip.

Dealer regime where market makers buy dips and sell rallies as part of standard hedging. Tends to dampen realized volatility. The market is usually in this regime when SPX trades comfortably above the flip.

Dealer regime where market makers must buy as price rises and sell as price falls. Tends to amplify realized volatility. Typically dominant during selloffs and reactive tape.

Secondary strike with meaningful open interest that does not clear the primary Wall threshold. Often acts as a pressure zone especially on 0DTE.

A group of neighboring strikes with elevated positioning that collectively behave like a single soft-edged Wall. Common near round-number strikes.

Price region bracketed by opposing positioning where dealer flow is roughly balanced. Price often chops inside battle zones until a driver breaks the balance.

First derivative of an option's price with respect to the underlying. A dealer's total delta must be neutralized through hedging in the underlying.

Second derivative — the rate at which delta changes with price. Governs how much hedging must happen for a given move.

Cross-derivative — how delta changes as implied volatility changes. Vanna-driven hedging can create flows even when price is flat, purely on IV shifts.

How delta decays over time. Charm flow is time-of-day / time-to-expiry sensitive and often visible in the final hours before expiry.

Zero days to expiry. Options that expire the same day they trade. Near-the-money gamma is enormous and decays through the session, compressing hedging lifecycles into hours.

The expiry price at which option holders would lose the most (equivalently, at which option sellers benefit most). Related to but distinct from GEX levels — Max Pain is a static end-of-day calculation, GEX levels are dynamic hedging estimates.

Tendency for the underlying to close near a strike with heavy open interest on expiry day. A textbook GEX-related effect, most visible on monthly opex.

Aggregate net position of market makers across options. Derived from open interest and inferred flow. Explains why some price levels attract mechanical dealer trades.

Continuous buying and selling of the underlying by market makers to keep their net delta near zero. The mechanic that produces GEX-based Walls.

Ratio of put to call open interest or volume. Extreme readings sometimes coincide with regime shifts; the raw number is noisy on its own. See reading the P/C ratio without overreacting.

Large block trades executed off-exchange, reported to the tape after execution. Frequently conflated with 'smart money' — the reality is more mixed. See dark pool prints vs options flow.

Real-time stream of options trades, often filtered by size or aggression. Different vendors define 'unusual' differently. Educational signal-adjacent, never a trade command.

Options order routed across multiple exchanges simultaneously to grab liquidity, typically indicating urgency.

A single large options order, often crossed off-exchange between institutional counterparties. Not automatically directional information.

Total number of outstanding option contracts at a strike/expiry not yet closed. GEX calculations weight by OI.

Number of contracts traded during a period. Distinct from OI: today's volume becomes tomorrow's OI only when new positions are opened.

Market's forward-looking estimate of underlying volatility, backed out of option prices. Not a directional signal — IV is a magnitude expectation.

Rapid drop in implied volatility after a scheduled event (earnings, Fed) resolves. Option prices decline sharply even if the underlying does not move.

Actual observed volatility of the underlying over a period. Compared with IV to gauge whether options are cheap or expensive.

CBOE index of 30-day SPX implied volatility. A general regime indicator; not a signal by itself.

Difference in implied volatility between OTM puts and OTM calls. Persistent negative skew in equity indexes reflects downside insurance demand.

IV across expirations. Backwardation (near-term IV higher than long-term) often signals stress; contango (long-term higher) is the normal state.

The difference between implied and realized volatility, on average. See our Library module 'Volatility Products' for how this is monetized.