| Symbol | Sector | SVR |
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| Symbol | Sector | SVR |
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| Symbol | Sector | Avg. SVR▾ | Rank▾ |
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Data. The universe is the S&P 500. The data is FINRA's daily Regulation SHO short-sale-volume file (the "CNMS" tape), published free at a per-date URL with no registration. FINRA's short interest data (total shares held short, reported twice a month) is behind a paid, registration-gated API Console, so it isn't used. Short sale volume and short interest are different metrics. This page measures a flow: the share of a stock's daily volume executed as a short sale. It doesn't measure a stock of outstanding short positions. A high short-sale-volume ratio (SVR) doesn't necessarily mean a large short position is building, since some of that volume closes out the same day or is market-maker hedging. It's an imperfect proxy for short-selling activity, not a substitute for short interest.
Calculation. For each company, SVR on a given day is ShortVolume / TotalVolume from that day's FINRA file. The sector chart, leaderboards and full table use each stock's average SVR over the most recent ~21 trading days. The market-median trend chart plots the market-wide median SVR for every trading day in FINRA's files. FINRA republishes full daily history, so the whole ~3-month window is built in a single run.
Forward-return test. It splits the ~3-month window into two non-overlapping halves, the same overlapping-window issue covered on Share Count Trends and Relative Strength Leaders/Laggards. Each stock's average SVR over the older half is the predictor, and its return relative to SPY over the newer half (Yahoo Finance daily adjusted closes) is the outcome. A negative relationship would match the finding that short sellers are informed (e.g. Diether, Lee & Werner, 2009): more short-sale activity before weaker returns. A flat or positive one would mean it isn't showing up in this window. Pearson (linear) and Spearman (rank) fits are both shown, as on Factor Analysis.
Company name and sector come from Sector Beeswarm. Dual-share-class tickers (e.g. Berkshire Hathaway's B shares) use a dash in the site's ticker convention and a dot in FINRA's data. Both forms are tried, and a ticker is left out if neither matches. This is a one-time snapshot for now. Refresh manually for a newer window.