You open your portfolio, a holding is down 6%, and the first thing your brain does is invent a story. Resist that. A price move is the sum of many forces, and the useful question isn't "is this bad?" — it's "which force actually moved it, and does that force persist?"
Start with the five usual suspects
Almost every single-stock move traces back to one of five drivers:
- Company-specific news — earnings, guidance, a downgrade, a product or legal event.
- Sector or peer move — if the whole group is red, it's rotation, not your company.
- Macro & rates — CPI, a Fed decision, jobs data, or a yield spike repricing the whole market.
- Flows & smart money — index rebalancing, a large institutional sale, options-driven pressure.
- Sentiment & technicals — a social narrative, a broken support level, or plain profit-taking.
A 60-second diagnostic
Work outside-in, fastest checks first:
- Is the index (S&P 500, NASDAQ-100) down a similar amount? Then it's macro — your stock is a passenger.
- Are the stock's peers down too? Then it's a sector move.
- Neither? Now look for company news — an earnings date, a filing, a headline.
- Still nothing? Check flows and sentiment — unusual volume, a viral post, an options expiry.
Separate signal from noise
A reason is only useful with two things attached: a source (the filing, the release, the price data) and a sense of whether it persists. An earnings miss reprices the business; a one-day sentiment dip usually doesn't. This is exactly what Oswol's Explain This Move does — it pairs the move with the news that triggered it, the macro backdrop, smart-money and social signals, and a 0–100 score with a confidence band, every claim sourced.