Short Interest¶
OVERVIEW¶
Short interest is the total number of shares of a stock that have been sold short and not yet bought back to close the position. Reported as both a raw share count and a percentage of the stock's public float, short interest represents a snapshot of aggregate bearish positioning — open bets that a stock will decline.
Tapeboard surfaces short interest data across all terminal views to support squeeze identification, sentiment analysis, borrow-cost monitoring, and risk management workflows.
Note
Short interest figures are published on a ~T+8 business day lag following FINRA's twice-monthly reporting cycle (as of the 15th and the last business day of each month). Data reflects positioning from mid-month, not the current tape.
KEY METRICS¶
| Metric | Formula | What It Tells You |
|---|---|---|
| Short % of Float | Short Interest ÷ Public Float × 100 | Proportion of tradeable shares sold short |
| Short Interest Ratio (Days to Cover) | Short Interest ÷ Average Daily Volume | Estimated trading days for shorts to fully cover |
| Short % of Shares Outstanding | Short Interest ÷ Shares Outstanding × 100 | Bearish positioning relative to total share count |
Tip
Days to Cover is the primary squeeze-vulnerability proxy. A higher number means shorts need more time — and more buying pressure — to exit, amplifying upside risk if a catalyst appears.
WORKED EXAMPLE¶
| Ticker | Short Interest | Float | Short % of Float | Days to Cover | Context |
|---|---|---|---|---|---|
| GME (Jan 2021) | ~61.8M shares | ~46.9M shares | ~140% | >6 | Extreme case; rehypothecation inflated figure above 100% |
| AMC (2021 peak) | — | — | ~20% | — | Meme-stock cycle peak |
| TSLA (typical) | — | — | 2–4% | — | Elevated large-cap short interest |
| AAPL (typical) | — | — | 0.6–1.2% | — | Baseline large-cap comparison |
Note
Short interest can exceed 100% of float due to rehypothecation — the same borrowed shares being lent and re-borrowed multiple times. This does not represent 100% directional conviction from distinct market participants.
HOW TO USE¶
Short Squeeze Screening Screen for equities where short interest exceeds 20% of float, then layer in positive catalysts — earnings beats, regulatory approvals, activist filings, or rising retail options flow — to identify actionable squeeze setups.
Contrarian Sentiment Gauging Monitor aggregate market-wide short interest as a sentiment indicator. Historically, extreme bearishness across the broad market has coincided with cyclical bottoms.
Borrow-Fee Monitoring Cross-reference short interest with cost-to-borrow data to identify crowded shorts approaching borrow capacity. High short interest combined with rising borrow fees signals a constrained supply of lendable shares.
Risk Management Track short interest on existing holdings to anticipate forced buy-in risk when prime brokers recall shares from borrowers.
LIMITATIONS¶
Data Staleness
The ~2-week reporting lag means published short interest reflects positioning from the previous reporting period, not the current market. Use Tapeboard's real-time borrow-rate feed alongside official figures to approximate current conditions.
| Limitation | Detail |
|---|---|
| Reporting lag | FINRA data is ~2 weeks old at publication; intra-period positioning shifts are invisible |
| Synthetic exposure excluded | Short positions via options, total return swaps, and CFDs do not appear in FINRA figures — true bearish exposure is understated |
| Rehypothecation inflation | Figures above 100% of float are mathematically possible and do not indicate a proportional number of unique short sellers |
| High short interest ≠ squeeze | A catalyst and trapped dealer gamma are required to convert high short interest into an actual squeeze |
| Informed bearish positioning | Elevated short interest on distressed or fraudulent names often reflects legitimate negative conviction, not squeeze opportunity |
| Provider discrepancies | Figures from Bloomberg, S3, and Ortex may differ from official FINRA releases; S3 and Ortex use proprietary lending-data estimates rather than waiting for the official report |