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What Is Short Interest and How to Read Short-Selling Activity

What percentage of a company's tradable shares are currently sold short — what it signals about market sentiment, and what a 'short squeeze' actually is.

The definition

Short Interest is the percentage of a company's tradable shares currently sold 'short' — investors who borrowed shares and sold them, betting the price will fall so they can buy them back cheaper, return them to the lender, and pocket the difference. High Short Interest means many investors are betting against that specific stock.

What it signals about sentiment

High Short Interest can reflect widespread concern about a real problem at the company — but it can also signal opportunity: if the company surprises to the upside, everyone who sold short has to buy back shares to close their position, creating additional buying pressure that can accelerate a price rise.

Short squeeze — when short sellers get squeezed

A 'short squeeze' happens when a stock with high Short Interest rises sharply, forcing many short sellers to buy back shares simultaneously to stop their losses — that forced buying feeds on itself and accelerates the rise even further, sometimes extremely fast. This dynamic has been behind some of the most dramatic market moves of recent years.

The limitations

Short Interest data is published by exchanges with a lag (typically twice a month), so it's always a snapshot of the past, not real time. High Short Interest also doesn't tell you when (or if) a squeeze will actually happen — it can persist for months without any change.

How StockIQ uses this

Short Interest data is shown on the stock page as-is — the trend over time, with no guessing about when a squeeze might happen. It's a complementary sentiment signal, not part of the weighted score itself.

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