Unusual Options Activity: how UOA signals let you follow smart money in real time

Unusual Options Activity refers to any options flow whose characteristics deviate clearly from the statistical norm of a given underlying. In practice: volume that shatters the 20-day moving average, a volume-to-open-interest ratio far above one, execution concentrated over a few minutes, or total premium out of all proportion with the contract's usual activity.

The concept was popularised in the 1980s by floor traders like Doug Cassidy, who showed that a sizeable institutional order always leaves observable footprints, simply because it cannot be executed discreetly. A fund that wants to buy 10,000 out-of-the-money calls on a thinly traded name has to sweep multiple exchanges, accept unfavourable spreads, and trigger alerts. Those frictions leave a trail, and that trail is precisely what our algorithms look for.

It matters to separate UOA from raw "high volume". Apple can trade 500,000 calls on a Friday expiration without it being remotely unusual. Conversely, 2,000 calls on a small-cap that usually trades 50 per day, concentrated in one hour and out of the money, constitute a strong signal even if the notional is ten times smaller.

Spotting abnormal volume is the easy part: any free scanner will do it. The hard part is filtering out false positives, which make up the overwhelming majority of raw alerts.

Among the most common traps:

• Market maker dynamic hedges :when a dealer sells a large options block, they must immediately hedge in mirror options, generating high volume with zero directional information.
• Expiration rolls :every third Friday, billions of dollars of positions are rolled mechanically. Volume spikes, but it says nothing about a new view.
• Trades around earnings and binary events :volume naturally explodes around these dates, and signals become unreadable without contextual filtering.
• Multi-leg strategies :a trader building a condor or a calendar pays the bid/ask across four contracts at once. It looks aggressive; it isn't.

A serious UOA engine therefore does more than measure volume: it classifies the execution type, scores aggressiveness (bid side vs ask side), cross-references open interest, and weights the result by the underlying's normal liquidity. Without these layers, the output is an unusable stream of noise.

Here is a real example of how a signal appears in the Lonqua UOA Screener:

What this signal actually tells us, column by column:

• UOA type, NVDA symbol, $950 strike, call, March 27 expiration :a trader is betting on Nvidia rallying above $950 before the end of March. With spot around $910, the strike is slightly out of the money, an aggressive directional bet.
• $2.85M premium :this is the capital committed in this single trade. At that scale, it is neither retail nor market maker flow. Only family offices, hedge funds, or institutional desks can write that ticket.
• Volume 12,400 versus open interest 1,850 :a Vol/OI ratio of 6.7x. New positioning is being created at a pace that outstrips the existing base by a wide margin. This is one of the most reliable statistical triggers.
• Detail "Block sweep" :the trade was executed as a single block that then swept across multiple exchanges. That combination signals execution urgency. The buyer did not want to wait and was prepared to pay the spread.
• STRONG strength :the proprietary score combines Vol/OI ratio, structure, aggressiveness and size. The STRONG label places this signal in the top 5% of alerts generated daily.

An experienced trader reads a signal like this in under five seconds. What matters is never a single signal, but the pattern: multiple bullish signals on the same underlying, the same expiration week, concentrated in a few hours, tell a far more convincing story than a single alert.

No unusual-activity signal predicts a move with certainty. A few structural reasons why:

• A large call purchase can be a hedge, for example a fund covering a short position on the underlying equity. What looks bullish can mask a structurally bearish stance.
• Institutional timing is not your timing :a fund playing a 3-month horizon can tolerate a 20% drawdown on its option while waiting for its catalyst. You, on a 5-day horizon, would already be stopped out.
• Algorithms evolve :market makers and funds regularly refine their execution techniques to mask their footprints. A criterion that worked in 2022 may be exhausted by 2026.
• The information is public :as soon as a signal is detected, it is detected by everyone. Alpha decays as latecomers pile in.

The golden rule: a UOA signal, taken on its own, never justifies a position. It must be confirmed by at least one other module (NPF, GEX) and integrated into a coherent thesis. That is exactly what a tool like Morning Briefing lets you do in a few minutes every morning.