Today, Decomposed components sum to the day's move
Market (beta × SPY)Sector (excess over market)Stock-specific
Differentiator Product
QL Why — why is it moving?
Your stock is down 3% and every headline has a story. Almost none of them will tell you the boring truth: most daily moves in most stocks are mostly the market. QL Why runs The Honest Attribution — it splits today's move into market, sector, and the part that is actually about this company, sized in sigmas against the stock's own history. When the scary headline explains nothing, it says so. Then it goes further: where the move was built (gap or intraday, closed at highs or lows), where the stock sits in its own tape (streak, 52-week range, moving averages), what it did after days like this before, and whether its industry peers moved with it.
Pick a ticker
Leave the date empty for the latest session, or point it at any past trading day. Works on ~5,000 US names; sector read uses the SPDR sector fund. QL Rubber Band answers the sister question — cheap, or is its sector just down?
The Attribution Tape last 10 sessions through the same lens
MarketSectorStock-specific◆ close-to-close move
The Verdict
Session Shape how the move was built
What Happened Next after days like this, historically
Peers Today
Session Tape each day's move, attributed
The Narrative Check
QL Why is diagnostic research, not investment advice. Attribution uses a two-factor regression of the stock's trailing daily returns (up to 250 sessions) on SPY and its SPDR sector fund's excess return, adjusted bars, no intercept; "stock-specific" is the residual and its σ is measured against the stock's own trailing residual volatility. Attribution is a statistical read, not a causal proof — a market-shaped move can still have a company-specific cause, and news timestamps are the vendor's. Context reads (returns, 52-week range, moving averages, ATR, close location) come from the same adjusted bars; "what happened next" counts same-direction days in the fit window at least as large as today (stock-specific σ when today is a ≥1σ residual day) and reports forward returns that end before the graded session — a sample, not a forecast. Peers are the largest names sharing the stock's SIC industry code, priced close-to-close from the grouped daily tape; sector breadth counts every sector member with two closes. Nothing you look up is stored.