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Read Why it moved
Updated 31 October 2026 · 3 min read · 14 Contents
Plain-language meaning
Why it moved lists a listing's notable price sessions and its most recent significant fall, and places each next to the stored evidence dated to that session or the day before: results, dividends, corporate actions, filings, insider disclosures and news.
Why it is useful #
It separates moves that came with the market from stock-specific ones and shows what was on record around them, so a move can be investigated instead of guessed at.
Where it appears and the workflow #
Open Market Details, then the Relative performance tab, and the Why it moved card; choose a 6-month or 1-year window. In the app it is on the stock's Technical tab. Notable sessions are listed largest first (up to 12) with their move, benchmark move, excess move, volume against the median and evidence links. Most recent decline shows the peak and trough dates, closes, sessions and the benchmark over the same dates; Where the fall happened splits the price lost on down days between sessions with and without evidence and shows the three largest one-day falls; Since the low and Results then and now follow.
Calculation or source #
Daily returns use adjusted closes. Volatility is estimated as 1.4826 × the median absolute deviation of returns, and a session is notable when its move is at least the larger of 3% and 2.5 times that volatility; it needs 40 usable returns. Excess move is the stock's move minus the benchmark's move. A session is stock-specific when the excess reaches the threshold, and market-wide when it does not and both moved the same way. The decline is the latest peak-to-trough fall of at least the larger of 10% and four times volatility on one comparable price basis, needing at least 20 sessions.
Prerequisites, inputs, period and unit #
Requires a Max plan and stored daily prices on an equity exchange. Moves are percentages; the window ends at the last completed session, shown as 'evidence through' a date.
Worked example #
Illustrative only: a stock falls 7% on a session when its benchmark falls 1%; the excess of 6 points is stock-specific, and a results filing dated the same day is listed beside it. The filing is associated with the move; the card does not claim it caused it.
What high and low mean #
A larger excess move means the stock moved more than its benchmark that session.
Positive, negative and zero #
Positive moves are rises and negative moves falls. A recovered status means the close is back at or above the peak; partly recovered means at least a quarter of the fall has been regained.
Limitations and common mistakes #
Evidence on the same day shows association, not cause, and routine disclosures are left out. Excess moves do not adjust for beta.
Market-specific differences #
Each listing is measured against its own exchange benchmark and native-currency prices.
Suggested next steps #
Open Why it moved for one listing, pick the largest stock-specific session and open its evidence link; then check the decline's benchmark move to see how much was market-wide.
Educational use only #
This guide explains descriptive research evidence. It is not investment advice, a price prediction, a recommendation, a claim of predictive accuracy, or an instruction to buy, sell, rebalance or place an order.