Forum Sentiment vs Share Price: What the Data Shows
Last updated 21 Feb 2026·3 min read
Forum Sentiment vs Share Price: What the Data Shows
There’s a common assumption in IR circles that forum sentiment is just noise — retail investors talking their book with no real impact on price. We tested that assumption. Using 12 months of Quarterback data across 200 ASX small and mid-cap stocks, we measured the relationship between HotCopper sentiment shifts and subsequent share price movements.
The results challenge the conventional wisdom.
What we measured
We tracked daily sentiment scores for each stock based on forum post volume, tone, and engagement. A sentiment score above the 30-day rolling average was classified as a positive shift; below was negative. We then measured the stock’s return over the following 5 trading days, adjusted for sector performance.
Key finding: Stocks with a sustained positive sentiment shift (3+ consecutive days above average) outperformed their sector by an average of 2.3% over the following week. Sustained negative shifts preceded underperformance of 1.8%. The effect was strongest in stocks with market caps below $200M.
Sentiment leads, price follows
The most striking finding was the timing. In 68% of cases where a stock experienced a significant price movement (>5% in a single day), forum sentiment had shifted measurably in the 48 hours prior. Forum activity wasn’t reacting to price changes — it was preceding them.
This makes intuitive sense when you consider how information flows in small-cap markets. Retail investors who are close to a company — customers, employees, industry observers — often discuss developments on forums before they become formal announcements. The forum acts as a leading indicator of information that hasn’t yet been disclosed.
When sentiment diverges from fundamentals
Not all sentiment signals are equal. The data showed that sentiment-price correlation broke down in two specific scenarios:
- Coordinated pumping — When a small number of accounts generated a disproportionate share of positive posts, the sentiment signal was unreliable. Quarterback flags these patterns automatically.
- Post-announcement noise — In the 24 hours immediately after a major announcement, forum sentiment reflected emotional reaction rather than informed analysis. The predictive signal returned after the initial noise subsided.
What this means for IR teams
Forum sentiment is not just noise. For ASX small and mid-caps, it’s a leading indicator of price direction, a real-time measure of how your narrative is landing, and an early warning system for disclosure risk. Companies that dismiss it are ignoring the channel where most of their shareholders form opinions.
The practical implication: if you’re not monitoring forum sentiment systematically, you’re missing information that your shareholders are acting on. And if that sentiment is based on false or misleading narratives, you may have a disclosure obligation you don’t even know about.
Quarterback tracks forum sentiment across HotCopper, Reddit, and social platforms in real time, with automated alerts when sentiment shifts significantly or diverges from trading patterns. Because the data shows what experienced IR professionals have always suspected: the forum conversation matters more than most companies realise.