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Short selling & short interest

Short selling is betting a stock will fall by borrowing and selling shares; short interest is the total number of shares currently sold short.

A short seller borrows shares, sells them, and hopes to buy them back later at a lower price — profiting if the stock falls and losing if it rises. Short interest is the aggregate count of a company’s shares currently held short. A high or rising short interest means many traders are betting against the stock, which can reflect skepticism about the business.

Short interest is a two-sided signal. It can flag genuine doubts, but a heavily shorted stock that rises can force short sellers to buy back shares to cut losses, driving the price up further — a "short squeeze." Short interest data is reported with a lag and is not a real-time or a directional prediction.

stocks-llm ingests official FINRA short-interest data, shown with its settlement date. It reports the raw reported figures and days-to-cover, and — where a verified share count exists — expresses short interest as a percent of shares OUTSTANDING. That is deliberately not the "percent of float" figure quoted elsewhere: float excludes insider and restricted shares, so it is the smaller base and would give a larger number. The FINRA file carries no float, so a percent of outstanding is the honest floor rather than a guess at the number people usually mean. It does not predict squeezes, and short interest is never presented as a buy or sell signal.

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Related terms

  • Insider trading (SEC Form 4) — Corporate insiders — officers, directors, and large shareholders — must disclose their trades in the company’s own stock on SEC Form 4.
  • Days to cover (short ratio) — Days to cover estimates how many days of normal trading it would take short sellers to buy back all the shares they have sold short.
  • Short squeeze — A short squeeze is when a rising stock forces short sellers to buy shares back to limit their losses, and that buying pushes the price up further.
  • Institutional ownership (SEC 13F) — Large investment managers must disclose their US stock holdings each quarter on SEC Form 13F, revealing which companies big institutions own.
  • Congressional stock trading — The STOCK Act requires U.S. House members to publicly disclose their stock transactions in periodic reports; stocks-llm covers the U.S. House disclosures.

See more terms in the stocks-llm glossary.

Informational only — NOT financial advice. This is an educational definition, not a recommendation to buy or sell anything. Metrics on stocks-llm are delayed data and may be missing or stale. Always verify information independently and consult a qualified financial professional before making any investment decision.