Understanding Mention Velocity: The First-Derivative Signal Most Traders Miss
The most common sentiment mistake is looking at raw mention counts. A stock with 500 mentions/day sustained for months is usually already priced. The stock going from 20 mentions/day to 200 mentions/day this week has something new to say. Velocity — the rate of change — is where the actionable signal lives.
Why raw counts don't predict
Raw mention counts reflect long-term retail attention which is largely priced. A ticker steady at 300 mentions/day has been discussed for months; its story is old and the market has already digested it. The Efficient Markets Hypothesis mostly wins on stable levels of sentiment — there's nothing new to react to.
Why velocity does
The change in mention counts reflects fresh information hitting the retail crowd. Something happened. Whether it's a catalyst, a technical breakout, an influencer post, or a rumor — retail is reacting to something new. That newness has predictive value because the market hasn't fully absorbed it yet. Studies consistently find velocity leads price moves in small-caps by 1-5 sessions.
The measurement choices
Not all velocity measurements are equal. Simple day-over-day change is noisy. A better approach uses a rolling baseline: mentions this session divided by trailing 7-day average. Values above 3 indicate meaningful acceleration. Above 10 is exceptional and often marks an ignition event. The Riot Score uses this baseline-normalized approach.
The velocity-of-velocity trick
Second-order velocity — the acceleration of the acceleration — is even earlier. If mention velocity is itself rising over trailing 24-72 hours (not just the level), the ticker is in the earliest phase of a sentiment ignition. This is where the strongest signal often sits, but it requires more sophisticated smoothing to avoid noise.
Where velocity fails
Two situations produce velocity spikes without predictive value: (1) promotional pumps where a coordinated group posts about a ticker they've been paid to promote — velocity spikes but the sentiment is inauthentic; (2) news-following where the price already moved and retail is chasing — velocity spikes but after the market has already priced the event. StockRiot's methodology attempts to filter for both.
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Why is mention velocity better than mention count?
Because levels reflect long-term already-priced attention; velocity reflects fresh news. Fresh news is where the predictive signal sits.
What velocity value is 'high'?
As a rule of thumb, mentions above 3x the trailing 7-day baseline is meaningful acceleration. Above 10x is exceptional.
How do you filter for promotional pumps?
By checking author breadth. Genuine sentiment spikes come from many unique authors. Promotional pumps typically come from a small cluster of accounts. Breadth-adjusted velocity is a better filter than raw velocity.
Does mention velocity work overnight and weekends?
Sentiment velocity in overnight and weekend windows is often more informative than during trading hours because there's no price feedback. Weekend velocity spikes on small-caps have produced some of the highest-hit-rate Monday-morning breakouts.
Can I trade purely on velocity?
You can, but combining velocity with short interest, technical structure, and catalyst news improves the hit rate. Velocity is a signal input; not a trading system on its own.